Commit Graph

3870 Commits

Author SHA1 Message Date
Linus Torvalds 5f21585384 for-linus-20181102
-----BEGIN PGP SIGNATURE-----
 
 iQJEBAABCAAuFiEEwPw5LcreJtl1+l5K99NY+ylx4KYFAlvchGgQHGF4Ym9lQGtl
 cm5lbC5kawAKCRD301j7KXHgpj/1D/4kEQx4ncnFoZk8QshHV1L++rH3BbcLjQDd
 Wbh9ZSIQdI/gHTzS6bE7x3YfcbpMWPMO3+jFawdfRiFTEjlF8vQ+mnJ+Btb3z4D6
 mGEeFGVhHExlp2a0x/Ma8YWVNlMB7BE8Tq73bZEVMY+9lbpmDW/vp7Sfa87LBDKQ
 ZmY+My+VdHN7qLtQ7t3W/HtpbU+kcXMMd3ICjK4i+ofXy6mynk4+oQ2jwyXc5L86
 UCJCsTsSRr3CgbnkW/uprHo0XHk8i7O/4C3oR+x4pAIxCCa9g+vmw0EO9fvi/2iQ
 qe8jKdm7Y09xu/TiPBa7iz45tdh0cNMJKo3OezmSF9Np+r69KL5C/U4GRPKN3Iwm
 keoqn14ScABkYMSe4ys1AdEgKD6bNUaW3r/lJxTH2oUR23mjnCLp7c4WD/G+MlbB
 CzoakQyCHTZmDFLr2Kc8bkjmpil2T2UFfmLIDAu30LWIYeSGpiIO/V+g1foJMF2f
 06ERltNvgX1BJjoh4NSWySLEf1ZtkUU60NeATRol6gwhnIyLrHsgfm6OEhqlW/7x
 Xc1BWyzX7K6c3Dskk/u5aSRyXOyRC9KkMt3/2XexeDNHkte9yMH0IgSvopPBuER8
 +iPvPjNp7ychTKZB3zpSnlqGgePTjbufIEBtO3OyUmDZKjUqxahtxkQfmPhoclu+
 XdR4ArcqNg==
 =0zM4
 -----END PGP SIGNATURE-----

Merge tag 'for-linus-20181102' of git://git.kernel.dk/linux-block

Pull block layer fixes from Jens Axboe:
 "The biggest part of this pull request is the revert of the blkcg
  cleanup series. It had one fix earlier for a stacked device issue, but
  another one was reported. Rather than play whack-a-mole with this,
  revert the entire series and try again for the next kernel release.

  Apart from that, only small fixes/changes.

  Summary:

   - Indentation fixup for mtip32xx (Colin Ian King)

   - The blkcg cleanup series revert (Dennis Zhou)

   - Two NVMe fixes. One fixing a regression in the nvme request
     initialization in this merge window, causing nvme-fc to not work.
     The other is a suspend/resume p2p resource issue (James, Keith)

   - Fix sg discard merge, allowing us to merge in cases where we didn't
     before (Jianchao Wang)

   - Call rq_qos_exit() after the queue is frozen, preventing a hang
     (Ming)

   - Fix brd queue setup, fixing an oops if we fail setting up all
     devices (Ming)"

* tag 'for-linus-20181102' of git://git.kernel.dk/linux-block:
  nvme-pci: fix conflicting p2p resource adds
  nvme-fc: fix request private initialization
  blkcg: revert blkcg cleanups series
  block: brd: associate with queue until adding disk
  block: call rq_qos_exit() after queue is frozen
  mtip32xx: clean an indentation issue, remove extraneous tabs
  block: fix the DISCARD request merge
2018-11-02 11:25:48 -07:00
Dennis Zhou b5f2954d30 blkcg: revert blkcg cleanups series
This reverts a series committed earlier due to null pointer exception
bug report in [1]. It seems there are edge case interactions that I did
not consider and will need some time to understand what causes the
adverse interactions.

The original series can be found in [2] with a follow up series in [3].

[1] https://www.spinics.net/lists/cgroups/msg20719.html
[2] https://lore.kernel.org/lkml/20180911184137.35897-1-dennisszhou@gmail.com/
[3] https://lore.kernel.org/lkml/20181020185612.51587-1-dennis@kernel.org/

This reverts the following commits:
d459d853c2, b2c3fa5467, 101246ec02, b3b9f24f5f, e2b0989954,
f0fcb3ec89, c839e7a03f, bdc2491708, 74b7c02a9b, 5bf9a1f3b4,
a7b39b4e96, 07b05bcc32, 49f4c2dc2b, 27e6fa996c

Signed-off-by: Dennis Zhou <dennis@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-11-01 19:59:53 -06:00
Linus Torvalds eb7046e9bf platform-drivers-x86 for v4.20-1
Move the Dell dcdbas and dell_rbu drivers into platform/drivers/x86 as
 they are closely coupled with other drivers in this location.
 
 Improve _init* usage for acerhdf and fix some usage issues with messages
 and module parameters.
 
 Simplify asus-wmi by calling ACPI/WMI methods directly, eliminating
 workqueue overhead, eliminate double reporting of keyboard backlight.
 
 Fix wake from USB failure on Bay Trail devices (intel_int0002_vgpio).
 
 Notify intel_telemetry users when IPC1 device is not enabled.
 
 Update various drivers with new laptop model IDs.
 
 Update several intel drivers to use SPDX identifers and order headers
 alphabetically.
 
 The following is an automated git shortlog grouped by driver:
 
 Add Intel AtomISP2 dummy / power-management driver:
  - Add Intel AtomISP2 dummy / power-management driver
 
 lg-laptop:
  - Add LG Gram laptop special features driver
 
 HID:
  -  asus: only support backlight when it's not driven by WMI
 
 MAINTAINERS:
  -  intel_telemetry: Update maintainers info
  -  intel_pmc_core: Update MAINTAINERS
  -  Update maintainer for dcdbas and dell_rbu
  -  Use my infradead account exclusively for PDx86 work
 
 acerhdf:
  -  restructure to allow large BIOS table be __initconst
  -  mark appropriate content with __init prefix
  -  Add BIOS entry for Gateway LT31 v1.3307
  -  Remove cut-and-paste trap from instructions
  -  Enable ability to list supported systems
  -  clarify modinfo messages for BIOS override
 
 asus-wmi:
  -  export function for evaluating WMI methods
  -  Only notify kbd LED hw_change by fn-key pressed
  -  Simplify the keyboard brightness updating process
 
 firmware:
  -  dcdbas: include linux/io.h
  -  dcdbas: Move dcdbas to drivers/platform/x86
  -  dell_rbu: Move dell_rbu to drivers/platform/x86
  -  dcdbas: Add support for WSMT ACPI table
  -  dell_rbu: Make payload memory uncachable
 
 ideapad-laptop:
  -  Add Y530-15ICH to no_hw_rfkill
  -  Use __func__ instead of read_ec_cmd in pr_err
 
 intel-hid:
  -  Convert to use SPDX identifier
 
 intel-ips:
  -  Convert to use SPDX identifier
 
 intel-rst:
  -  Convert to use SPDX identifier
  -  Sort headers alphabetically
 
 intel-smartconnect:
  -  Convert to use SPDX identifier
  -  Sort headers alphabetically
 
 intel-wmi-thunderbolt:
  -  Add dynamic debugging
  -  Convert to use SPDX identifier
 
 intel_bxtwc_tmu:
  -  Convert to use SPDX identifier
 
 intel_cht_int33fe:
  -  Convert to use SPDX identifier
 
 intel_chtdc_ti_pwrbtn:
  -  Add SPDX identifier
 
 intel_int0002_vgpio:
  -  Convert to use SPDX identifier
  -  Implement irq_set_wake
  -  Enable the driver on Bay Trail platforms
 
 intel_menlow:
  -  Convert to use SPDX identifier
  -  Sort headers alphabetically
 
 intel_mid_powerbtn:
  -  Convert to use SPDX identifier
  -  Remove unnecessary init.h inclusion
  -  Get rid of custom ICPU() macro
 
 intel_mid_thermal:
  -  Convert to use SPDX identifier
  -  Sort headers alphabetically
 
 intel_oaktrail:
  -  Convert to use SPDX identifier
  -  Sort headers alphabetically
 
 intel_pmc:
  -  Convert to use SPDX identifier
  -  Sort headers alphabetically
 
 intel_punit_ipc:
  -  Convert to use SPDX identifier
  -  Sort headers alphabetically
 
 intel_scu_ipc:
  -  Convert to use SPDX identifier
  -  Sort headers alphabetically
 
 intel_telemetry:
  -  Get rid of custom macro
  -  report debugfs failure
  -  Convert to use SPDX identifier
 
 intel_turbo_max_3:
  -  Convert to use SPDX identifier
  -  Sort headers alphabetically
 
 mlx-platform:
  -  Properly use mlxplat_mlxcpld_msn201x_items
 
 touchscreen_dmi:
  -  Add min-x and min-y settings for various models
  -  Add info for the Onda V80 Plus v3 tablet
  -  Add info for the Trekstor Primetab T13B tablet
  -  Add info for the Trekstor Primebook C11 convertible
 
 tracing:
  -  Trivia spelling fix containerof() -> container_of()
 
 wmi:
  -  declare device_type structure as constant
 -----BEGIN PGP SIGNATURE-----
 
 iQEcBAABAgAGBQJb2mDCAAoJEKbMaAwKp364KdkH/Rar8cenw7uFeVzT5o4fGzTn
 0Oo1Pnwh+hPgmQwmf8O/mHsa/1Zb9nX4nNLU/ysDUjAAZ9wZLoB57HlImQquPA74
 c8lXTz5MVF140WB1f1Ck5PmeonJR2Xve7HTYCoBmGo71jOxHxCgJbp1Giiho0Imd
 3NXzzahEnAiy/L5PhqqYTmIfTeAHQ2Fo7GkHCjMnS20FP2fBtvPrc7db03F+FZ4y
 QTfbT0oR42NdeW21AbCRGY3P47axB3xDJX4LOYrb4uo4CIzd1yatlHk407NRRyv8
 pab6aeJR23FouA/tcvv+T36D3vqRw78e6BWdoyowWOd7CUOgjtSC3lKGzfT6hSY=
 =0BDZ
 -----END PGP SIGNATURE-----

Merge tag 'platform-drivers-x86-v4.20-1' of git://git.infradead.org/linux-platform-drivers-x86

Pull x86 platform driver updates from Darren Hart:

 - Move the Dell dcdbas and dell_rbu drivers into platform/drivers/x86
   as they are closely coupled with other drivers in this location.

 - Improve _init* usage for acerhdf and fix some usage issues with
   messages and module parameters.

 - Simplify asus-wmi by calling ACPI/WMI methods directly, eliminating
   workqueue overhead, eliminate double reporting of keyboard backlight.

 - Fix wake from USB failure on Bay Trail devices (intel_int0002_vgpio).

 - Notify intel_telemetry users when IPC1 device is not enabled.

 - Update various drivers with new laptop model IDs.

 - Update several intel drivers to use SPDX identifers and order headers
   alphabetically.

* tag 'platform-drivers-x86-v4.20-1' of git://git.infradead.org/linux-platform-drivers-x86: (64 commits)
  HID: asus: only support backlight when it's not driven by WMI
  platform/x86: asus-wmi: export function for evaluating WMI methods
  platform/x86: asus-wmi: Only notify kbd LED hw_change by fn-key pressed
  platform/x86: wmi: declare device_type structure as constant
  platform/x86: ideapad: Add Y530-15ICH to no_hw_rfkill
  platform/x86: Add Intel AtomISP2 dummy / power-management driver
  platform/x86: touchscreen_dmi: Add min-x and min-y settings for various models
  platform/x86: touchscreen_dmi: Add info for the Onda V80 Plus v3 tablet
  platform/x86: touchscreen_dmi: Add info for the Trekstor Primetab T13B tablet
  platform/x86: intel_telemetry: Get rid of custom macro
  platform/x86: intel_telemetry: report debugfs failure
  MAINTAINERS: intel_telemetry: Update maintainers info
  platform/x86: Add LG Gram laptop special features driver
  platform/x86: asus-wmi: Simplify the keyboard brightness updating process
  platform/x86: touchscreen_dmi: Add info for the Trekstor Primebook C11 convertible
  platform/x86: mlx-platform: Properly use mlxplat_mlxcpld_msn201x_items
  MAINTAINERS: intel_pmc_core: Update MAINTAINERS
  firmware: dcdbas: include linux/io.h
  platform/x86: intel-wmi-thunderbolt: Add dynamic debugging
  platform/x86: intel-wmi-thunderbolt: Convert to use SPDX identifier
  ...
2018-11-01 08:42:21 -07:00
Linus Torvalds 343a9f3540 The biggest change here is the updates to kprobes
Back in January I posted patches to create function based events. These were
 the events that you suggested I make to allow developers to easily create
 events in code where no trace event exists. After posting those changes for
 review, it was suggested that we implement this instead with kprobes.
 
 The problem with kprobes is that the interface is too complex and needs to
 be simplified. Masami Hiramatsu posted patches in March and I've been
 playing with them a bit. There's been a bit of clean up in the kprobe code
 that was inspired by the function based event patches, and a couple of
 enhancements to the kprobe event interface.
 
  - If the arch supports it (we added support for x86), you can place a
    kprobe event at the start of a function and use $arg1, $arg2, etc
    to reference the arguments of a function. (Before you needed to know
    what register or where on the stack the argument was).
 
  - The second is a way to see array of events. For example, if you reference
    a mac address, you can add:
 
    echo 'p:mac ip_rcv perm_addr=+574($arg2):x8[6]' > kprobe_events
 
    And this will produce:
 
    mac: (ip_rcv+0x0/0x140) perm_addr={0x52,0x54,0x0,0xc0,0x76,0xec}
 
 Other changes include
 
  - Exporting trace_dump_stack to modules
 
  - Have the stack tracer trace the entire stack (stop trying to remove
    tracing itself, as we keep removing too much).
 
  - Added support for SDT in uprobes
 -----BEGIN PGP SIGNATURE-----
 
 iIoEABYIADIWIQRRSw7ePDh/lE+zeZMp5XQQmuv6qgUCW9hdjxQccm9zdGVkdEBn
 b29kbWlzLm9yZwAKCRAp5XQQmuv6qmtbAP9GS/o2WSvsYLSIw4+mF94eCL06lUxp
 rRrktkEofm/PagEAl2JNmvHrAJN+LIrajqXTbwlZ7Ckk1rZhCW41Am7qnQs=
 =sTUM
 -----END PGP SIGNATURE-----

Merge tag 'trace-v4.20' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

Pull tracing updates from Steven Rostedt:
 "The biggest change here is the updates to kprobes

  Back in January I posted patches to create function based events.
  These were the events that you suggested I make to allow developers to
  easily create events in code where no trace event exists. After
  posting those changes for review, it was suggested that we implement
  this instead with kprobes.

  The problem with kprobes is that the interface is too complex and
  needs to be simplified. Masami Hiramatsu posted patches in March and
  I've been playing with them a bit. There's been a bit of clean up in
  the kprobe code that was inspired by the function based event patches,
  and a couple of enhancements to the kprobe event interface.

   - If the arch supports it (we added support for x86), you can place a
     kprobe event at the start of a function and use $arg1, $arg2, etc
     to reference the arguments of a function. (Before you needed to
     know what register or where on the stack the argument was).

   - The second is a way to see array of events. For example, if you
     reference a mac address, you can add:

	echo 'p:mac ip_rcv perm_addr=+574($arg2):x8[6]' > kprobe_events

     And this will produce:

	mac: (ip_rcv+0x0/0x140) perm_addr={0x52,0x54,0x0,0xc0,0x76,0xec}

  Other changes include

   - Exporting trace_dump_stack to modules

   - Have the stack tracer trace the entire stack (stop trying to remove
     tracing itself, as we keep removing too much).

   - Added support for SDT in uprobes"

[ SDT - "Statically Defined Tracing" are userspace markers for tracing.
  Let's not use random TLA's in explanations unless they are fairly
  well-established as generic (at least for kernel people) - Linus ]

* tag 'trace-v4.20' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: (24 commits)
  tracing: Have stack tracer trace full stack
  tracing: Export trace_dump_stack to modules
  tracing: probeevent: Fix uninitialized used of offset in parse args
  tracing/kprobes: Allow kprobe-events to record module symbol
  tracing/kprobes: Check the probe on unloaded module correctly
  tracing/uprobes: Fix to return -EFAULT if copy_from_user failed
  tracing: probeevent: Add $argN for accessing function args
  x86: ptrace: Add function argument access API
  tracing: probeevent: Add array type support
  tracing: probeevent: Add symbol type
  tracing: probeevent: Unify fetch_insn processing common part
  tracing: probeevent: Append traceprobe_ for exported function
  tracing: probeevent: Return consumed bytes of dynamic area
  tracing: probeevent: Unify fetch type tables
  tracing: probeevent: Introduce new argument fetching code
  tracing: probeevent: Remove NOKPROBE_SYMBOL from print functions
  tracing: probeevent: Cleanup argument field definition
  tracing: probeevent: Cleanup print argument functions
  trace_uprobe: support reference counter in fd-based uprobe
  perf probe: Support SDT markers having reference counter (semaphore)
  ...
2018-10-30 09:49:56 -07:00
Linus Torvalds f4267b3604 Masami had a couple more fixes to the synthetic events. One was a proper
error return value, and the other is for the self tests.
 -----BEGIN PGP SIGNATURE-----
 
 iIoEABYIADIWIQRRSw7ePDh/lE+zeZMp5XQQmuv6qgUCW9hYsBQccm9zdGVkdEBn
 b29kbWlzLm9yZwAKCRAp5XQQmuv6qiWPAQCARhYpeiWNHYGAirpI1vxaNHzutZvP
 j6eaqRXu0JDfsQD7Bb19KxSHUEaPSpZIo68N5OJkoTv9UxD2KYuRysu4VQ8=
 =y1Gc
 -----END PGP SIGNATURE-----

Merge tag 'trace-v4.19-rc8-3' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

Pull tracing fixes from Steven Rostedt:
 "Masami had a couple more fixes to the synthetic events. One was a
  proper error return value, and the other is for the self tests"

* tag 'trace-v4.19-rc8-3' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  selftests/ftrace: Fix synthetic event test to delete event correctly
  tracing: Return -ENOENT if there is no target synthetic event
2018-10-30 09:47:28 -07:00
Masami Hiramatsu 18858511fd tracing: Return -ENOENT if there is no target synthetic event
Return -ENOENT error if there is no target synthetic event.
This notices an operation failure to user as below;

  # echo 'wakeup_latency u64 lat; pid_t pid;' > synthetic_events
  # echo '!wakeup' >> synthetic_events
  sh: write error: No such file or directory

Link: http://lkml.kernel.org/r/154013449986.25576.9487131386597290172.stgit@devbox

Acked-by: Tom Zanussi <zanussi@linux.intel.com>
Tested-by: Tom Zanussi <zanussi@linux.intel.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Rajvi Jingar <rajvi.jingar@intel.com>
Cc: stable@vger.kernel.org
Fixes: 4b147936fa ('tracing: Add support for 'synthetic' events')
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2018-10-28 04:58:15 -04:00
Steven Rostedt (VMware) a2acce5369 tracing: Have stack tracer trace full stack
The stack tracer traces every function call checking the current stack (in
non interrupt context), looking for the deepest stack, and saving it when it
finds a new max depth. The problem is that it calls save_stack_trace(), and
with the new ORC unwinder, it can skip too much. As it looks at the ip of
the function call in the backtrace to find where it should start, it doesn't
need to skip anything.

The stack trace selftest would fail when the kernel was complied with the
ORC UNDWINDER enabled. Without skipping functions when doing the stack
trace, it now passes again.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2018-10-27 11:15:04 -04:00
Nikolay Borisov da387e5c93 tracing: Export trace_dump_stack to modules
There is no reason for this function to be unexprted and it's a useful
debugging aid.

Link: http://lkml.kernel.org/r/1539759103-5923-1-git-send-email-nborisov@suse.com

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2018-10-27 11:15:03 -04:00
Linus Torvalds 6ab9e09238 for-4.20/block-20181021
-----BEGIN PGP SIGNATURE-----
 
 iQJEBAABCAAuFiEEwPw5LcreJtl1+l5K99NY+ylx4KYFAlvNQKgQHGF4Ym9lQGtl
 cm5lbC5kawAKCRD301j7KXHgps+8D/9Iy6YIeoPwN10gYsqIh0P2fS3wKzL3kiww
 3vFsWO78PzgLxUlNmB7teLtNFc/R5mi8becZmAdvs9za5YFZk56o3Ifv1x+e+z00
 VY1/gxhiJD6suLeJ6lECnERGDaiWOZVRMo2TE17vxYGW6GGaa0Ts6PUUXmpla1u5
 WKctgt0Qv9WVNyiIdLdeHqzKJwsSSwNTt8fK7eFhy3x8e0CwJr+GtXckbbW3LFkY
 lug0npsTli3EmEPMovZhd25SjZmTk5GTM+ADZQ7Tnv5KXoDWB9jn6TcCSAi3G+5d
 5WUVwfnDyYJiH8qvlg5tRJ690muIy3xMOmpr7QBQ0YnR/LQ3EW+1CVfqD+qimgLH
 TXzlREXQpBP3YlxSDS5nddz4o5z84GZmC9B/43ujPaZKIQ6eBXYdkmQH7tPtSugm
 C6VGomR5tHotjxIiAsexh/5hAus+wW8bObKGTPTyINT0ub3XNclwCKLh26CgI9ie
 WvbS9g3j/KPvu/7s6weZpgD+cks0YdWe/XdXXxiHwsGI9h3J2aJna5RQt1rKWDm5
 wGCgbc/B8eSwiWx+GXlqdB9/Dy/bGXOnSTDnKpEVl1f5zNjeLwUKXbjvkMefWs4m
 jEIcquuDETORY+ZYEfa5YbmS4Lhskr0kzMVTVkZ++81tAWpSCU9Xh3IHrR8TNpt+
 J0oh0FHBDg==
 =LRTT
 -----END PGP SIGNATURE-----

Merge tag 'for-4.20/block-20181021' of git://git.kernel.dk/linux-block

Pull block layer updates from Jens Axboe:
 "This is the main pull request for block changes for 4.20. This
  contains:

   - Series enabling runtime PM for blk-mq (Bart).

   - Two pull requests from Christoph for NVMe, with items such as;
      - Better AEN tracking
      - Multipath improvements
      - RDMA fixes
      - Rework of FC for target removal
      - Fixes for issues identified by static checkers
      - Fabric cleanups, as prep for TCP transport
      - Various cleanups and bug fixes

   - Block merging cleanups (Christoph)

   - Conversion of drivers to generic DMA mapping API (Christoph)

   - Series fixing ref count issues with blkcg (Dennis)

   - Series improving BFQ heuristics (Paolo, et al)

   - Series improving heuristics for the Kyber IO scheduler (Omar)

   - Removal of dangerous bio_rewind_iter() API (Ming)

   - Apply single queue IPI redirection logic to blk-mq (Ming)

   - Set of fixes and improvements for bcache (Coly et al)

   - Series closing a hotplug race with sysfs group attributes (Hannes)

   - Set of patches for lightnvm:
      - pblk trace support (Hans)
      - SPDX license header update (Javier)
      - Tons of refactoring patches to cleanly abstract the 1.2 and 2.0
        specs behind a common core interface. (Javier, Matias)
      - Enable pblk to use a common interface to retrieve chunk metadata
        (Matias)
      - Bug fixes (Various)

   - Set of fixes and updates to the blk IO latency target (Josef)

   - blk-mq queue number updates fixes (Jianchao)

   - Convert a bunch of drivers from the old legacy IO interface to
     blk-mq. This will conclude with the removal of the legacy IO
     interface itself in 4.21, with the rest of the drivers (me, Omar)

   - Removal of the DAC960 driver. The SCSI tree will introduce two
     replacement drivers for this (Hannes)"

* tag 'for-4.20/block-20181021' of git://git.kernel.dk/linux-block: (204 commits)
  block: setup bounce bio_sets properly
  blkcg: reassociate bios when make_request() is called recursively
  blkcg: fix edge case for blk_get_rl() under memory pressure
  nvme-fabrics: move controller options matching to fabrics
  nvme-rdma: always have a valid trsvcid
  mtip32xx: fully switch to the generic DMA API
  rsxx: switch to the generic DMA API
  umem: switch to the generic DMA API
  sx8: switch to the generic DMA API
  sx8: remove dead IF_64BIT_DMA_IS_POSSIBLE code
  skd: switch to the generic DMA API
  ubd: remove use of blk_rq_map_sg
  nvme-pci: remove duplicate check
  drivers/block: Remove DAC960 driver
  nvme-pci: fix hot removal during error handling
  nvmet-fcloop: suppress a compiler warning
  nvme-core: make implicit seed truncation explicit
  nvmet-fc: fix kernel-doc headers
  nvme-fc: rework the request initialization code
  nvme-fc: introduce struct nvme_fcp_op_w_sgl
  ...
2018-10-22 17:46:08 +01:00
Masami Hiramatsu a360d9e401 tracing: Fix synthetic event to allow semicolon at end
Fix synthetic event to allow independent semicolon at end.

The synthetic_events interface accepts a semicolon after the
last word if there is no space.

 # echo "myevent u64 var;" >> synthetic_events

But if there is a space, it returns an error.

 # echo "myevent u64 var ;" > synthetic_events
 sh: write error: Invalid argument

This behavior is difficult for users to understand. Let's
allow the last independent semicolon too.

Link: http://lkml.kernel.org/r/153986835420.18251.2191216690677025744.stgit@devbox

Cc: Shuah Khan <shuah@kernel.org>
Cc: Tom Zanussi <tom.zanussi@linux.intel.com>
Cc: stable@vger.kernel.org
Fixes: commit 4b147936fa ("tracing: Add support for 'synthetic' events")
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2018-10-19 17:25:11 -04:00
Masami Hiramatsu 282447ba6b tracing: Fix synthetic event to accept unsigned modifier
Fix synthetic event to accept unsigned modifier for its field type
correctly.

Currently, synthetic_events interface returns error for "unsigned"
modifiers as below;

 # echo "myevent unsigned long var" >> synthetic_events
 sh: write error: Invalid argument

This is because argv_split() breaks "unsigned long" into "unsigned"
and "long", but parse_synth_field() doesn't expected it.

With this fix, synthetic_events can handle the "unsigned long"
correctly like as below;

 # echo "myevent unsigned long var" >> synthetic_events
 # cat synthetic_events
 myevent	unsigned long var

Link: http://lkml.kernel.org/r/153986832571.18251.8448135724590496531.stgit@devbox

Cc: Shuah Khan <shuah@kernel.org>
Cc: Tom Zanussi <tom.zanussi@linux.intel.com>
Cc: stable@vger.kernel.org
Fixes: commit 4b147936fa ("tracing: Add support for 'synthetic' events")
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2018-10-19 17:25:11 -04:00
Steven Rostedt (VMware) 12ad0cb212 tracing: Use trace_clock_local() for looping in preemptirq_delay_test.c
The preemptirq_delay_test module is used for the ftrace selftest code that
tests the latency tracers. The problem is that it uses ktime for the delay
loop, and then checks the tracer to see if the delay loop is caught, but the
tracer uses trace_clock_local() which uses various different other clocks to
measure the latency. As ktime uses the clock cycles, and the code then
converts that to nanoseconds, it causes rounding errors, and the preemptirq
latency tests are failing due to being off by 1 (it expects to see a delay
of 500000 us, but the delay is only 499999 us). This is happening due to a
rounding error in the ktime (which is totally legit). The purpose of the
test is to see if it can catch the delay, not to test the accuracy between
trace_clock_local() and ktime_get(). Best to use apples to apples, and have
the delay loop use the same clock as the latency tracer does.

Cc: stable@vger.kernel.org
Fixes: f96e8577da ("lib: Add module for testing preemptoff/irqsoff latency tracers")
Acked-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2018-10-17 15:35:33 -04:00
Steven Rostedt (VMware) bf173ca92d tracing: probeevent: Fix uninitialized used of offset in parse args
Dan's smatch utility found an uninitialized use of offset in a path in
parse_probe_args(). Unless an offset is specifically specified for commands
that allow them, it should default to zero.

Link: http://lkml.kernel.org/r/20181012134246.5doqaobxunlqqs53@mwanda
Fixes: 533059281e ("tracing: probeevent: Introduce new argument fetching code")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com> (smatch)
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2018-10-12 12:50:22 -04:00
Masami Hiramatsu a6682814f3 tracing/kprobes: Allow kprobe-events to record module symbol
Allow kprobe-events to record module symbols.

Since data symbols in a non-loaded module doesn't exist, it fails to
define such symbol as an argument of kprobe-event. But if the kprobe
event is defined on that module, we can defer to resolve the symbol
address.

Note that if given symbol is not found, the event is kept unavailable.
User can enable it but the event is not recorded.

Link: http://lkml.kernel.org/r/153547312336.26502.11432902826345374463.stgit@devbox

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2018-10-10 22:19:12 -04:00
Masami Hiramatsu 59158ec4ae tracing/kprobes: Check the probe on unloaded module correctly
Current kprobe event doesn't checks correctly whether the
given event is on unloaded module or not. It just checks
the event has ":" in the name.

That is not enough because if we define a probe on non-exist
symbol on loaded module, it allows to define that (with
warning message)

To ensure it correctly, this searches the module name on
loaded module list and only if there is not, it allows to
define it. (this event will be available when the target
module is loaded)

Link: http://lkml.kernel.org/r/153547309528.26502.8300278470528281328.stgit@devbox

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2018-10-10 22:19:12 -04:00
Masami Hiramatsu f3f58935ed tracing/uprobes: Fix to return -EFAULT if copy_from_user failed
Fix probe_mem_read() to return -EFAULT if copy_from_user()
failed. The copy_from_user() returns remaining bytes
when it failed, but probe_mem_read() caller expects it
returns error code like as probe_kernel_read().

Link: http://lkml.kernel.org/r/153547306719.26502.8353484532699160223.stgit@devbox

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2018-10-10 22:19:11 -04:00
Masami Hiramatsu a1303af5d7 tracing: probeevent: Add $argN for accessing function args
Add $argN special fetch variable for accessing function
arguments. This allows user to trace the Nth argument easily
at the function entry.

Note that this returns most probably assignment of registers
and stacks. In some case, it may not work well. If you need
to access correct registers or stacks you should use perf-probe.

Link: http://lkml.kernel.org/r/152465888632.26224.3412465701570253696.stgit@devbox

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2018-10-10 22:19:11 -04:00
Masami Hiramatsu 40b53b7718 tracing: probeevent: Add array type support
Add array type support for probe events.
This allows user to get arraied types from memory address.
The array type syntax is

	TYPE[N]

Where TYPE is one of types (u8/16/32/64,s8/16/32/64,
x8/16/32/64, symbol, string) and N is a fixed value less
than 64.

The string array type is a bit different from other types. For
other base types, <base-type>[1] is equal to <base-type>
(e.g. +0(%di):x32[1] is same as +0(%di):x32.) But string[1] is not
equal to string. The string type itself represents "char array",
but string array type represents "char * array". So, for example,
+0(%di):string[1] is equal to +0(+0(%di)):string.

Link: http://lkml.kernel.org/r/152465891533.26224.6150658225601339931.stgit@devbox

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2018-10-10 22:19:10 -04:00
Masami Hiramatsu 60c2e0cebf tracing: probeevent: Add symbol type
Add "symbol" type to probeevent, which is an alias of u32 or u64
(depends on BITS_PER_LONG). This shows the result value in
symbol+offset style. This type is only available with kprobe
events.

Link: http://lkml.kernel.org/r/152465882860.26224.14779072294412467338.stgit@devbox

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2018-10-10 22:19:10 -04:00
Masami Hiramatsu 9b960a3883 tracing: probeevent: Unify fetch_insn processing common part
Unify the fetch_insn bottom process (from stage 2: dereference
indirect data) from kprobe and uprobe events, since those are
mostly same.

Link: http://lkml.kernel.org/r/152465879965.26224.8547240824606804815.stgit@devbox

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2018-10-10 22:19:09 -04:00
Masami Hiramatsu 0a46c8549f tracing: probeevent: Append traceprobe_ for exported function
Append traceprobe_ for exported function set_print_fmt() as
same as other functions.

Link: http://lkml.kernel.org/r/152465877071.26224.11143125027282999726.stgit@devbox

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2018-10-10 22:19:09 -04:00
Masami Hiramatsu 9178412ddf tracing: probeevent: Return consumed bytes of dynamic area
Cleanup string fetching routine so that returns the consumed
bytes of dynamic area and store the string information as
data_loc format instead of data_rloc.
This simplifies the fetcharg loop.

Link: http://lkml.kernel.org/r/152465874163.26224.12125143907501289031.stgit@devbox

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2018-10-10 22:19:08 -04:00
Masami Hiramatsu f451bc89d8 tracing: probeevent: Unify fetch type tables
Unify {k,u}probe_fetch_type_table to probe_fetch_type_table
because the main difference of those type tables (fetcharg
methods) are gone. Now we can consolidate it.

Link: http://lkml.kernel.org/r/152465871274.26224.13999436317830479698.stgit@devbox

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2018-10-10 22:19:08 -04:00
Masami Hiramatsu 533059281e tracing: probeevent: Introduce new argument fetching code
Replace {k,u}probe event argument fetching framework with switch-case based.
Currently that is implemented with structures, macros and chain of
function-pointers, which is more complicated than necessary and may get a
performance penalty by retpoline.

This simplify that with an array of "fetch_insn" (opcode and oprands), and
make process_fetch_insn() just interprets it. No function pointers are used.

Link: http://lkml.kernel.org/r/152465868340.26224.2551120475197839464.stgit@devbox

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2018-10-10 22:19:07 -04:00
Masami Hiramatsu 7bfbc63eda tracing: probeevent: Remove NOKPROBE_SYMBOL from print functions
Remove unneeded NOKPROBE_SYMBOL from print functions since
the print functions are only used when printing out the
trace data, and not from kprobe handler.

Link: http://lkml.kernel.org/r/152465865422.26224.10111548170594014954.stgit@devbox

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2018-10-10 22:19:07 -04:00
Masami Hiramatsu eeb07b0615 tracing: probeevent: Cleanup argument field definition
Cleanup event argument definition code in one place for
maintenancability.

Link: http://lkml.kernel.org/r/152465862529.26224.9068605421476018902.stgit@devbox

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2018-10-10 22:19:06 -04:00
Masami Hiramatsu 56de763052 tracing: probeevent: Cleanup print argument functions
Cleanup the print-argument function to decouple it into
print-name and print-value, so that it can support more
flexible expression, like array type.

Link: http://lkml.kernel.org/r/152465859635.26224.13452846788717102315.stgit@devbox

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2018-10-10 22:19:06 -04:00
Song Liu a6ca88b241 trace_uprobe: support reference counter in fd-based uprobe
This patch enables uprobes with reference counter in fd-based uprobe.
Highest 32 bits of perf_event_attr.config is used to stored offset
of the reference count (semaphore).

Format information in /sys/bus/event_source/devices/uprobe/format/ is
updated to reflect this new feature.

Link: http://lkml.kernel.org/r/20181002053636.1896903-1-songliubraving@fb.com

Cc: Oleg Nesterov <oleg@redhat.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-and-tested-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2018-10-10 22:14:17 -04:00
Jens Axboe c0aac682fa This is the 4.19-rc6 release
-----BEGIN PGP SIGNATURE-----
 
 iQIzBAABCAAdFiEEZH8oZUiU471FcZm+ONu9yGCSaT4FAluw4MIACgkQONu9yGCS
 aT7+8xAAiYnc4khUsxeInm3z44WPfRX1+UF51frTNSY5C8Nn5nvRSnTUNLuKkkrz
 8RbwCL6UYyJxF9I/oZdHPsPOD4IxXkQY55tBjz7ZbSBIFEwYM6RJMm8mAGlXY7wq
 VyWA5MhlpGHM9DjrguB4DMRipnrSc06CVAnC+ZyKLjzblzU1Wdf2dYu+AW9pUVXP
 j4r74lFED5djPY1xfqfzEwmYRCeEGYGx7zMqT3GrrF5uFPqj1H6O5klEsAhIZvdl
 IWnJTU2coC8R/Sd17g4lHWPIeQNnMUGIUbu+PhIrZ/lDwFxlocg4BvarPXEdzgYi
 gdZzKBfovpEsSu5RCQsKWG4IGQxY7I1p70IOP9eqEFHZy77qT1YcHVAWrK1Y/bJd
 UA08gUOSzRnhKkNR3+PsaMflUOl9WkpyHECZu394cyRGMutSS50aWkavJPJ/o1Qi
 D/oGqZLLcKFyuNcchG+Met1TzY3LvYEDgSburqwqeUZWtAsGs8kmiiq7qvmXx4zV
 IcgM8ERqJ8mbfhfsXQU7hwydIrPJ3JdIq19RnM5ajbv2Q4C/qJCyAKkQoacrlKR4
 aiow/qvyNrP80rpXfPJB8/8PiWeDtAnnGhM+xySZNlw3t8GR6NYpUkIzf5TdkSb3
 C8KuKg6FY9QAS62fv+5KK3LB/wbQanxaPNruQFGe5K1iDQ5Fvzw=
 =dMl4
 -----END PGP SIGNATURE-----

Merge tag 'v4.19-rc6' into for-4.20/block

Merge -rc6 in, for two reasons:

1) Resolve a trivial conflict in the blk-mq-tag.c documentation
2) A few important regression fixes went into upstream directly, so
   they aren't in the 4.20 branch.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

* tag 'v4.19-rc6': (780 commits)
  Linux 4.19-rc6
  MAINTAINERS: fix reference to moved drivers/{misc => auxdisplay}/panel.c
  cpufreq: qcom-kryo: Fix section annotations
  perf/core: Add sanity check to deal with pinned event failure
  xen/blkfront: correct purging of persistent grants
  Revert "xen/blkfront: When purging persistent grants, keep them in the buffer"
  selftests/powerpc: Fix Makefiles for headers_install change
  blk-mq: I/O and timer unplugs are inverted in blktrace
  dax: Fix deadlock in dax_lock_mapping_entry()
  x86/boot: Fix kexec booting failure in the SEV bit detection code
  bcache: add separate workqueue for journal_write to avoid deadlock
  drm/amd/display: Fix Edid emulation for linux
  drm/amd/display: Fix Vega10 lightup on S3 resume
  drm/amdgpu: Fix vce work queue was not cancelled when suspend
  Revert "drm/panel: Add device_link from panel device to DRM device"
  xen/blkfront: When purging persistent grants, keep them in the buffer
  clocksource/drivers/timer-atmel-pit: Properly handle error cases
  block: fix deadline elevator drain for zoned block devices
  ACPI / hotplug / PCI: Don't scan for non-hotplug bridges if slot is not bridge
  drm/syncobj: Don't leak fences when WAIT_FOR_SUBMIT is set
  ...

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-10-01 08:58:57 -06:00
Andy Shevchenko ca9184f079 tracing: Trivia spelling fix containerof() -> container_of()
This is the only location on kernel that has wrong spelling
of the container_of() helper. Fix it.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
2018-09-26 12:21:00 +03:00
Ravi Bangoria ccea8727dc trace_uprobe/sdt: Prevent multiple reference counter for same uprobe
We assume to have only one reference counter for one uprobe.
Don't allow user to add multiple trace_uprobe entries having
same inode+offset but different reference counter.

Ex,
  # echo "p:sdt_tick/loop2 /home/ravi/tick:0x6e4(0x10036)" > uprobe_events
  # echo "p:sdt_tick/loop2_1 /home/ravi/tick:0x6e4(0xfffff)" >> uprobe_events
  bash: echo: write error: Invalid argument

  # dmesg
  trace_kprobe: Reference counter offset mismatch.

There is one exception though:
When user is trying to replace the old entry with the new
one, we allow this if the new entry does not conflict with
any other existing entries.

Link: http://lkml.kernel.org/r/20180820044250.11659-4-ravi.bangoria@linux.ibm.com

Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Reviewed-by: Song Liu <songliubraving@fb.com>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Tested-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2018-09-24 04:44:54 -04:00
Ravi Bangoria 1cc33161a8 uprobes: Support SDT markers having reference count (semaphore)
Userspace Statically Defined Tracepoints[1] are dtrace style markers
inside userspace applications. Applications like PostgreSQL, MySQL,
Pthread, Perl, Python, Java, Ruby, Node.js, libvirt, QEMU, glib etc
have these markers embedded in them. These markers are added by developer
at important places in the code. Each marker source expands to a single
nop instruction in the compiled code but there may be additional
overhead for computing the marker arguments which expands to couple of
instructions. In case the overhead is more, execution of it can be
omitted by runtime if() condition when no one is tracing on the marker:

    if (reference_counter > 0) {
        Execute marker instructions;
    }

Default value of reference counter is 0. Tracer has to increment the
reference counter before tracing on a marker and decrement it when
done with the tracing.

Implement the reference counter logic in core uprobe. User will be
able to use it from trace_uprobe as well as from kernel module. New
trace_uprobe definition with reference counter will now be:

    <path>:<offset>[(ref_ctr_offset)]

where ref_ctr_offset is an optional field. For kernel module, new
variant of uprobe_register() has been introduced:

    uprobe_register_refctr(inode, offset, ref_ctr_offset, consumer)

No new variant for uprobe_unregister() because it's assumed to have
only one reference counter for one uprobe.

[1] https://sourceware.org/systemtap/wiki/UserSpaceProbeImplementation

Note: 'reference counter' is called as 'semaphore' in original Dtrace
(or Systemtap, bcc and even in ELF) documentation and code. But the
term 'semaphore' is misleading in this context. This is just a counter
used to hold number of tracers tracing on a marker. This is not really
used for any synchronization. So we are calling it a 'reference counter'
in kernel / perf code.

Link: http://lkml.kernel.org/r/20180820044250.11659-2-ravi.bangoria@linux.ibm.com

Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
[Only trace_uprobe.c]
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Song Liu <songliubraving@fb.com>
Tested-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2018-09-24 04:44:53 -04:00
Steven Rostedt (VMware) d6b183eda4 tracing/kprobe: Remove unneeded extra strchr() from create_trace_kprobe()
By utilizing a temporary variable, we can avoid adding another call to
strchr(). Instead, save the first call to a temp variable, and then use that
variable as the reference to set the event variable.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2018-09-24 04:44:52 -04:00
Dennis Zhou (Facebook) c839e7a03f blkcg: remove bio->bi_css and instead use bio->bi_blkg
Prior patches ensured that all bios are now associated with some blkg.
This now makes bio->bi_css unnecessary as blkg maintains a reference to
the blkcg already.

This patch removes the field bi_css and transfers corresponding uses to
access via bi_blkg.

Signed-off-by: Dennis Zhou <dennisszhou@gmail.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-09-21 20:29:13 -06:00
Vaibhav Nagarnaik 83f365554e ring-buffer: Allow for rescheduling when removing pages
When reducing ring buffer size, pages are removed by scheduling a work
item on each CPU for the corresponding CPU ring buffer. After the pages
are removed from ring buffer linked list, the pages are free()d in a
tight loop. The loop does not give up CPU until all pages are removed.
In a worst case behavior, when lot of pages are to be freed, it can
cause system stall.

After the pages are removed from the list, the free() can happen while
the work is rescheduled. Call cond_resched() in the loop to prevent the
system hangup.

Link: http://lkml.kernel.org/r/20180907223129.71994-1-vnagarnaik@google.com

Cc: stable@vger.kernel.org
Fixes: 83f40318da ("ring-buffer: Make removal of ring buffer pages atomic")
Reported-by: Jason Behmer <jbehmer@google.com>
Signed-off-by: Vaibhav Nagarnaik <vnagarnaik@google.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2018-09-17 18:15:11 -04:00
Linus Torvalds 452938cbd8 Masami found an off by one bug in the code that keeps "notrace" functions
from being traced by kprobes. During my testing, I found that there's places
 that we may want to add kprobes to notrace, thus we may end up changing this
 code before 4.19 is released. The history behind this change is that we
 found that adding kprobes to various notrace functions caused the kernel to
 crashed. We took the safe route and decided not to allow kprobes to trace
 any notrace function. But because notrace is added to functions that just
 cause weird side effects to the function tracer, but are still safe,
 preventing kprobes for all notrace functios may be too much of a big hammer.
 One such place is __schedule() is marked notrace, to keep function tracer
 from doing strange recursive loops when it gets traced with NEED_RESCHED
 set. With this change, one can not add kprobes to the scheduler.
 
 Masami also added code to use gcov on ftrace.
 -----BEGIN PGP SIGNATURE-----
 
 iIoEABYIADIWIQRRSw7ePDh/lE+zeZMp5XQQmuv6qgUCW34RpBQccm9zdGVkdEBn
 b29kbWlzLm9yZwAKCRAp5XQQmuv6qhwzAQDITRob1VjOF8RavMbfBZZuhwHPQROF
 XsIFcD+jghFOUgEA1zXX4w+SwOV7S+chpGKMh3DlNKIbYPA+8eiMNFfDsA4=
 =u+oq
 -----END PGP SIGNATURE-----

Merge tag 'trace-v4.19-1' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

Pull tracing fixes from Steven Rostedt:
 "Masami found an off by one bug in the code that keeps "notrace"
  functions from being traced by kprobes. During my testing, I found
  that there's places that we may want to add kprobes to notrace, thus
  we may end up changing this code before 4.19 is released.

  The history behind this change is that we found that adding kprobes to
  various notrace functions caused the kernel to crashed. We took the
  safe route and decided not to allow kprobes to trace any notrace
  function.

  But because notrace is added to functions that just cause weird side
  effects to the function tracer, but are still safe, preventing kprobes
  for all notrace functios may be too much of a big hammer.

  One such place is __schedule() is marked notrace, to keep function
  tracer from doing strange recursive loops when it gets traced with
  NEED_RESCHED set. With this change, one can not add kprobes to the
  scheduler.

  Masami also added code to use gcov on ftrace"

* tag 'trace-v4.19-1' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  tracing/kprobes: Fix to check notrace function with correct range
  tracing: Allow gcov profiling on only ftrace subsystem
2018-08-23 13:07:00 -07:00
Linus Torvalds 5bed49adfe for-4.19/post-20180822
-----BEGIN PGP SIGNATURE-----
 
 iQJEBAABCAAuFiEEwPw5LcreJtl1+l5K99NY+ylx4KYFAlt9on8QHGF4Ym9lQGtl
 cm5lbC5kawAKCRD301j7KXHgpj1xEADKBmJlV9aVyxc5w6XggqAGeHqI4afFrl+v
 9fW6WUQMAaBUrr7PMIEJQ0Zm4B7KxgBaEWNtuuj4ULkjpgYm2AuGUuTJSyKz41rS
 Ma+KNyCA2Zmq4SvwGFbcdCuCbUqnoxTycscAgCjuDvIYLW0+nFGNc47ibmu9lZIV
 33Ef5LrxuCjhC2zyNxEdWpUxDCjoYzock85LW+wYyIYLU9uKdoExS+YmT8U+ebA/
 AkXBcxPztNDxwkcsIwgGVoTjwxiowqGz3uueWfyEmYgaCPiNOsxkoNQAtjX4ykQE
 hnqnHWyzJkRwbYo7Vd/bRAZXvszKGYE1YcJmu5QrNf0dK5MSq2o5OYJAEJWbucPj
 m0R2u7O9qbS2JEnxGrm5+oYJwBzwNY5/Lajr15WkljTqobKnqcvn/Hdgz/XdGtek
 0S1QHkkBsF7e+cax8sePWK+O3ilY7pl9CzyZKB/tJngl8A45Jv8xVojg0v3O7oS+
 zZib0rwWg/bwR/uN6uPCDcEsQusqL5YovB7m6NRVshwz6cV1zVNp2q+iOulk7KuC
 MprW4Du9CJf8HA19XtyJIG1XLstnuz+Exy+i5BiimUJ5InoEFDuj/6OZa6Qaczbo
 SrDDvpGtSf4h7czKpE5kV4uZiTOrjuI30TrI+4csdZ7HQIlboxNL72seNTLJs55F
 nbLjRM8L6g==
 =FS7e
 -----END PGP SIGNATURE-----

Merge tag 'for-4.19/post-20180822' of git://git.kernel.dk/linux-block

Pull more block updates from Jens Axboe:

 - Set of bcache fixes and changes (Coly)

 - The flush warn fix (me)

 - Small series of BFQ fixes (Paolo)

 - wbt hang fix (Ming)

 - blktrace fix (Steven)

 - blk-mq hardware queue count update fix (Jianchao)

 - Various little fixes

* tag 'for-4.19/post-20180822' of git://git.kernel.dk/linux-block: (31 commits)
  block/DAC960.c: make some arrays static const, shrinks object size
  blk-mq: sync the update nr_hw_queues with blk_mq_queue_tag_busy_iter
  blk-mq: init hctx sched after update ctx and hctx mapping
  block: remove duplicate initialization
  tracing/blktrace: Fix to allow setting same value
  pktcdvd: fix setting of 'ret' error return for a few cases
  block: change return type to bool
  block, bfq: return nbytes and not zero from struct cftype .write() method
  block, bfq: improve code of bfq_bfqq_charge_time
  block, bfq: reduce write overcharge
  block, bfq: always update the budget of an entity when needed
  block, bfq: readd missing reset of parent-entity service
  blk-wbt: fix IO hang in wbt_wait()
  block: don't warn for flush on read-only device
  bcache: add the missing comments for smp_mb()/smp_wmb()
  bcache: remove unnecessary space before ioctl function pointer arguments
  bcache: add missing SPDX header
  bcache: move open brace at end of function definitions to next line
  bcache: add static const prefix to char * array declarations
  bcache: fix code comments style
  ...
2018-08-22 13:38:05 -07:00
Masami Hiramatsu 9161a864ff tracing/kprobes: Fix to check notrace function with correct range
Fix within_notrace_func() to check notrace function correctly.

Since the ftrace_location_range(start, end) function checks
the range inclusively (start <= ftrace-loc <= end), the end
address must not include the entry address of next function.

However, within_notrace_func() uses kallsyms_lookup_size_offset()
to get the function size and calculate the end address from
adding the size to the entry address. This means the end address
is the entry address of the next function.

In the result, within_notrace_func() fails to find notrace
function if the next function of the target function is
ftraced.

Let's subtract 1 from the end address so that ftrace_location_range()
can check it correctly.

Link: http://lkml.kernel.org/r/153485669706.16611.17726752296213785504.stgit@devbox

Fixes: commit 45408c4f92 ("tracing: kprobes: Prohibit probing on notrace function")
Reported-by: Michael Rodin <michael@rodin.online>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2018-08-21 09:41:12 -04:00
Masami Hiramatsu 6b7dca401c tracing: Allow gcov profiling on only ftrace subsystem
Add GCOV_PROFILE_FTRACE to allow gcov profiling on only files in ftrace
subsystem. This config option will be used for checking kselftest/ftrace
coverage.

Link: http://lkml.kernel.org/r/153483647755.32472.4746349899604275441.stgit@devbox

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2018-08-21 09:11:49 -04:00
Linus Torvalds 7140ad3898 Updates for v4.19:
- Restructure of lockdep and latency tracers
 
    This is the biggest change. Joel Fernandes restructured the hooks
    from irqs and preemption disabling and enabling. He got rid of
    a lot of the preprocessor #ifdef mess that they caused.
 
    He turned both lockdep and the latency tracers to use trace events
    inserted in the preempt/irqs disabling paths. But unfortunately,
    these started to cause issues in corner cases. Thus, parts of the
    code was reverted back to where lockde and the latency tracers
    just get called directly (without using the trace events).
    But because the original change cleaned up the code very nicely
    we kept that, as well as the trace events for preempt and irqs
    disabling, but they are limited to not being called in NMIs.
 
  - Have trace events use SRCU for "rcu idle" calls. This was required
    for the preempt/irqs off trace events. But it also had to not
    allow them to be called in NMI context. Waiting till Paul makes
    an NMI safe SRCU API.
 
  - New notrace SRCU API to allow trace events to use SRCU.
 
  - Addition of mcount-nop option support
 
  - SPDX headers replacing GPL templates.
 
  - Various other fixes and clean ups.
 
  - Some fixes are marked for stable, but were not fully tested
    before the merge window opened.
 -----BEGIN PGP SIGNATURE-----
 
 iIoEABYIADIWIQRRSw7ePDh/lE+zeZMp5XQQmuv6qgUCW3ruhRQccm9zdGVkdEBn
 b29kbWlzLm9yZwAKCRAp5XQQmuv6qiM7AP47NhYdSnCFCRUJfrt6PovXmQtuCHt3
 c3QMoGGdvzh9YAEAqcSXwh7uLhpHUp1LjMAPkXdZVwNddf4zJQ1zyxQ+EAU=
 =vgEr
 -----END PGP SIGNATURE-----

Merge tag 'trace-v4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

Pull tracing updates from Steven Rostedt:

 - Restructure of lockdep and latency tracers

   This is the biggest change. Joel Fernandes restructured the hooks
   from irqs and preemption disabling and enabling. He got rid of a lot
   of the preprocessor #ifdef mess that they caused.

   He turned both lockdep and the latency tracers to use trace events
   inserted in the preempt/irqs disabling paths. But unfortunately,
   these started to cause issues in corner cases. Thus, parts of the
   code was reverted back to where lockdep and the latency tracers just
   get called directly (without using the trace events). But because the
   original change cleaned up the code very nicely we kept that, as well
   as the trace events for preempt and irqs disabling, but they are
   limited to not being called in NMIs.

 - Have trace events use SRCU for "rcu idle" calls. This was required
   for the preempt/irqs off trace events. But it also had to not allow
   them to be called in NMI context. Waiting till Paul makes an NMI safe
   SRCU API.

 - New notrace SRCU API to allow trace events to use SRCU.

 - Addition of mcount-nop option support

 - SPDX headers replacing GPL templates.

 - Various other fixes and clean ups.

 - Some fixes are marked for stable, but were not fully tested before
   the merge window opened.

* tag 'trace-v4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: (44 commits)
  tracing: Fix SPDX format headers to use C++ style comments
  tracing: Add SPDX License format tags to tracing files
  tracing: Add SPDX License format to bpf_trace.c
  blktrace: Add SPDX License format header
  s390/ftrace: Add -mfentry and -mnop-mcount support
  tracing: Add -mcount-nop option support
  tracing: Avoid calling cc-option -mrecord-mcount for every Makefile
  tracing: Handle CC_FLAGS_FTRACE more accurately
  Uprobe: Additional argument arch_uprobe to uprobe_write_opcode()
  Uprobes: Simplify uprobe_register() body
  tracepoints: Free early tracepoints after RCU is initialized
  uprobes: Use synchronize_rcu() not synchronize_sched()
  tracing: Fix synchronizing to event changes with tracepoint_synchronize_unregister()
  ftrace: Remove unused pointer ftrace_swapper_pid
  tracing: More reverting of "tracing: Centralize preemptirq tracepoints and unify their usage"
  tracing/irqsoff: Handle preempt_count for different configs
  tracing: Partial revert of "tracing: Centralize preemptirq tracepoints and unify their usage"
  tracing: irqsoff: Account for additional preempt_disable
  trace: Use rcu_dereference_raw for hooks from trace-event subsystem
  tracing/kprobes: Fix within_notrace_func() to check only notrace functions
  ...
2018-08-20 18:32:00 -07:00
Steven Rostedt (VMware) bb730b5833 tracing: Fix SPDX format headers to use C++ style comments
The Linux kernel adopted the SPDX License format headers to ease license
compliance management, and uses the C++ '//' style comments for the SPDX
header tags. Some files in the tracing directory used the C style /* */
comments for them. To be consistent across all files, replace the /* */
C style SPDX tags with the C++ // SPDX tags.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2018-08-16 19:08:06 -04:00
Steven Rostedt (VMware) bcea3f96e1 tracing: Add SPDX License format tags to tracing files
Add the SPDX License header to ease license compliance management.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2018-08-16 19:08:06 -04:00
Steven Rostedt (VMware) 179a0cc4e0 tracing: Add SPDX License format to bpf_trace.c
Add the SPDX License header to ease license compliance management.

Acked-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2018-08-16 19:07:36 -04:00
Steven Rostedt (VMware) 757d914007 tracing/blktrace: Fix to allow setting same value
Masami Hiramatsu reported:

  Current trace-enable attribute in sysfs returns an error
  if user writes the same setting value as current one,
  e.g.

    # cat /sys/block/sda/trace/enable
    0
    # echo 0 > /sys/block/sda/trace/enable
    bash: echo: write error: Invalid argument
    # echo 1 > /sys/block/sda/trace/enable
    # echo 1 > /sys/block/sda/trace/enable
    bash: echo: write error: Device or resource busy

  But this is not a preferred behavior, it should ignore
  if new setting is same as current one. This fixes the
  problem as below.

    # cat /sys/block/sda/trace/enable
    0
    # echo 0 > /sys/block/sda/trace/enable
    # echo 1 > /sys/block/sda/trace/enable
    # echo 1 > /sys/block/sda/trace/enable

Link: http://lkml.kernel.org/r/20180816103802.08678002@gandalf.local.home

Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: linux-block@vger.kernel.org
Cc: stable@vger.kernel.org
Fixes: cd649b8bb8 ("blktrace: remove sysfs_blk_trace_enable_show/store()")
Reported-by: Masami Hiramatsu <mhiramat@kernel.org>
Tested-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-08-16 14:13:56 -06:00
Steven Rostedt (VMware) 91c1e6ba39 blktrace: Add SPDX License format header
Add the SPDX License header to ease license compliance management.

Acked-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2018-08-16 15:49:02 -04:00
Vasily Gorbik 2f4df0017b tracing: Add -mcount-nop option support
-mcount-nop gcc option generates the calls to the profiling functions
as nops which allows to avoid patching mcount jump with NOP instructions
initially.

-mcount-nop gcc option will be activated if platform selects
HAVE_NOP_MCOUNT and gcc actually supports it.
In addition to that CC_USING_NOP_MCOUNT is defined and could be used by
architectures to adapt ftrace patching behavior.

Link: http://lkml.kernel.org/r/patch-3.thread-aa7b8d.git-e02ed2dc082b.your-ad-here.call-01533557518-ext-9465@work.hours

Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2018-08-15 22:38:38 -04:00
Linus Torvalds b125d90388 Printk changes for 4.19
-----BEGIN PGP SIGNATURE-----
 Version: GnuPG v2
 
 iQIcBAABAgAGBQJbct5hAAoJEFKgDEdIgJTysFoP/jRoozkNpUr4fqcbN+1GCSjY
 /vaWMJ6cQBHm9b5AE+EYwomTqx5gkaaAw8oR3tnHvBa2NGsE4xzO2LUyuH95FgMo
 cE74MGS492xeCskEBHk0pbrdD+DOuIIqWlQcDP0mH0OhlBiuW/+j72HhDfOU5yTv
 uE/X+SyxnYgWW9rKGrkmHqVwJPiEgjtr1tsfsewWVF4MNndCAFYeOgpFZBfhBdnq
 g57IRjTHLnkAClFrOzUpGIZ/tvN6iyENug860EORYFzSO2SVZ3Jm7v8AcXLQ6lj0
 LKmBAoFWeJ95rqJS+rBq3s0hWQLtbVJgQyz2ujN5+a+oZ/+brtQmTHjD9Nri0cSf
 cKUmSfMX4tqdMcGjc7B2RqAtdthst2kYy6RXlp4BzYcdoxDr4U45VTqS8gZQuPSt
 cdLUgoUEEX7nt1zlQER6GDzWc3FVKDXSHbDM+4OykFF3k1JCgoDq0kemAmsZw2A6
 2QGs7RqBKYidR7DB+beZj2YV0ihRkykwb5c+NUASJV5mIB8TjjmOEw52Q0Fc9Hl1
 WbA0wm/+pNG7ur9hF0VZ7zy9Rfxgx2Ec5ekWGTgt8xog3B1Dsqix5RpGRDX/f1u8
 /dJxHD70pzADwdXXF5hrdCRtCXsTd/27SnWREYhMhfqwu/awc3boOKonOITCYmvv
 7eiffcIaUbfiKsIhgrf+
 =TTFG
 -----END PGP SIGNATURE-----

Merge tag 'printk-for-4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk

Pull printk updates from Petr Mladek:

 - Different vendors have a different expectation about a console
   quietness. Make it configurable to reduce bike-shedding about the
   upstream default

 - Decide about the message visibility when the message is stored. It
   avoids races caused by a delayed console handling

 - Always store printk() messages into the per-CPU buffers again in NMI.
   The only exception is when flushing trace log in panic(). There the
   risk of loosing messages is worth an eventual reordering

 - Handle invalid %pO printf modifiers correctly

 - Better handle %p printf modifier tests before crng is initialized

 - Some clean up

* tag 'printk-for-4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk:
  lib/vsprintf: Do not handle %pO[^F] as %px
  printk: Fix warning about unused suppress_message_printing
  printk/nmi: Prevent deadlock when accessing the main log buffer in NMI
  printk: Create helper function to queue deferred console handling
  printk: Split the code for storing a message into the log buffer
  printk: Clean up syslog_print_all()
  printk: Remove unnecessary kmalloc() from syslog during clear
  printk: Make CONSOLE_LOGLEVEL_QUIET configurable
  printk: make sure to print log on console.
  lib/test_printf.c: accept "ptrval" as valid result for plain 'p' tests
2018-08-15 11:18:53 -07:00
Linus Torvalds e6ecec342f This was a moderately busy cycle for docs, with the usual collection of
small fixes and updates.  We also have new ktime_get_*() docs from Arnd,
 some kernel-doc fixes, a new set of Italian translations (non so se vale la
 pena, ma non fa male - speriamo bene), and some extensive early
 memory-management documentation improvements from Mike Rapoport.
 -----BEGIN PGP SIGNATURE-----
 
 iQIcBAABAgAGBQJbcZVtAAoJEI3ONVYwIuV64ekP/jgTlMi/fErRu6zlsrsWgiIK
 ir8ueCQ1OSiwOA+N2fUb+2+zlLlfTLgQ+o5IwmZk6rizG87fQ3Rp6i+bvYAZWITh
 YUuls3VhtRlJZqG1EW7gww1Q2IhRO6GhcpsIamAvhrSLFPaCKiN3JomJi/X47Pfj
 Ibl24HsruI2fDM1JwWRwCtE5J6vCL9lH1/5v4zVv7xdrVgTrwkZ/hAsE7HBNNat5
 dSku2u9HSAXa4KR4sLWrVJ8UI5+fylwilz/57HhCeduQDwKCHE/mfhxLdqL4Oa4q
 oHTCNq2zTUj4w7GTvHS1g0P3y/iWMYjAzH2is+BokilpIC65NwwsKx2ybZd3Srdh
 zwP/kYk5U+mYSgdDlyNqwPCibw8KDXB3srKMzyQSN6tkosKCOHFSXF0Js0eupi7t
 NqmGigl3Qozj1uvU6Wy7vh58u+GFeuO4PF566t2m70Jp0cWzuVKLrBvgNO1X37rB
 aEBrpOYB/H54t/qf79IFW//pptWXFNZ3S9AgyDVIcmX5C2ihaCoaPNRTom+KbH/D
 QEoH9rwWSoCi2DGoR83D+G8thCUfB4yfEGulSSIA4pUR7qvIR5rd1ZioI/qtgAHm
 l7MjTbLpPwiMnpFkBrxxxlFFb4gbETakMBGYoYee8ww5WbQLu0qA93AbwIXyjhE8
 mqCOLyBdCAZ0mNxqPSsc
 =x/P0
 -----END PGP SIGNATURE-----

Merge tag 'docs-4.19' of git://git.lwn.net/linux

Pull documentation update from Jonathan Corbet:
 "This was a moderately busy cycle for docs, with the usual collection
  of small fixes and updates.

  We also have new ktime_get_*() docs from Arnd, some kernel-doc fixes,
  a new set of Italian translations (non so se vale la pena, ma non fa
  male - speriamo bene), and some extensive early memory-management
  documentation improvements from Mike Rapoport"

* tag 'docs-4.19' of git://git.lwn.net/linux: (52 commits)
  Documentation: corrections to console/console.txt
  Documentation: add ioctl number entry for v4l2-subdev.h
  Remove gendered language from management style documentation
  scripts/kernel-doc: Escape all literal braces in regexes
  docs/mm: add description of boot time memory management
  docs/mm: memblock: add overview documentation
  docs/mm: memblock: add kernel-doc description for memblock types
  docs/mm: memblock: add kernel-doc comments for memblock_add[_node]
  docs/mm: memblock: update kernel-doc comments
  mm/memblock: add a name for memblock flags enumeration
  docs/mm: bootmem: add overview documentation
  docs/mm: bootmem: add kernel-doc description of 'struct bootmem_data'
  docs/mm: bootmem: fix kernel-doc warnings
  docs/mm: nobootmem: fixup kernel-doc comments
  mm/bootmem: drop duplicated kernel-doc comments
  Documentation: vm.txt: Adding 'nr_hugepages_mempolicy' parameter description.
  doc:it_IT: translation for kernel-hacking
  docs: Fix the reference labels in Locking.rst
  doc: tracing: Fix a typo of trace_stat
  mm: Introduce new type vm_fault_t
  ...
2018-08-14 14:29:31 -07:00
Linus Torvalds 73ba2fb33c for-4.19/block-20180812
-----BEGIN PGP SIGNATURE-----
 
 iQJEBAABCAAuFiEEwPw5LcreJtl1+l5K99NY+ylx4KYFAltwvasQHGF4Ym9lQGtl
 cm5lbC5kawAKCRD301j7KXHgpv65EACTq5gSLnJBI6ZPr1RAHruVDnjfzO2Veitl
 tUtjm0XfWmnEiwQ3dYvnyhy99xbyaG3900d9BClCTlH6xaUdSiQkDpcKG/R2F36J
 5mZitYukQcpFAQJWF8YKsTTE7JPl4VglCIDqYiC4+C3rOSVi8lrKn2qp4J4MMCFn
 thRg3jCcq7c5s9Eigsop1pXWQSasubkXfk55Krcp4oybKYpYRKXXf74Mj14QAbwJ
 QHN3VisyAUWoBRg7UQZo1Npe2oPk6bbnJypnjf8M0M2EnlvddEkIlHob91sodka8
 6p4APOEu5cbyXOBCAQsw/koff14mb8aEadqeQA68WvXfIdX9ZjfxCX0OoC3sBEXk
 yqJhZ0C980AM13zIBD8ejv4uasGcPca8W+47mE5P8sRiI++5kBsFWDZPCtUBna0X
 2Kh24NsmEya9XRR5vsB84dsIPQ3tLMkxg/IgQRVDaSnfJz0c/+zm54xDyKRaFT4l
 5iERk2WSkm9+8jNfVmWG0edrv6nRAXjpGwFfOCPh6/LCSCi4xQRULYN7sVzsX8ZK
 FRjt24HftBI8mJbh4BtweJvg+ppVe1gAk3IO3HvxAQhv29Hz+uvFYe9kL+3N8LJA
 Qosr9n9O4+wKYizJcDnw+5iPqCHfAwOm9th4pyedR+R7SmNcP3yNC8AbbheNBiF5
 Zolos5H+JA==
 =b9ib
 -----END PGP SIGNATURE-----

Merge tag 'for-4.19/block-20180812' of git://git.kernel.dk/linux-block

Pull block updates from Jens Axboe:
 "First pull request for this merge window, there will also be a
  followup request with some stragglers.

  This pull request contains:

   - Fix for a thundering heard issue in the wbt block code (Anchal
     Agarwal)

   - A few NVMe pull requests:
      * Improved tracepoints (Keith)
      * Larger inline data support for RDMA (Steve Wise)
      * RDMA setup/teardown fixes (Sagi)
      * Effects log suppor for NVMe target (Chaitanya Kulkarni)
      * Buffered IO suppor for NVMe target (Chaitanya Kulkarni)
      * TP4004 (ANA) support (Christoph)
      * Various NVMe fixes

   - Block io-latency controller support. Much needed support for
     properly containing block devices. (Josef)

   - Series improving how we handle sense information on the stack
     (Kees)

   - Lightnvm fixes and updates/improvements (Mathias/Javier et al)

   - Zoned device support for null_blk (Matias)

   - AIX partition fixes (Mauricio Faria de Oliveira)

   - DIF checksum code made generic (Max Gurtovoy)

   - Add support for discard in iostats (Michael Callahan / Tejun)

   - Set of updates for BFQ (Paolo)

   - Removal of async write support for bsg (Christoph)

   - Bio page dirtying and clone fixups (Christoph)

   - Set of bcache fix/changes (via Coly)

   - Series improving blk-mq queue setup/teardown speed (Ming)

   - Series improving merging performance on blk-mq (Ming)

   - Lots of other fixes and cleanups from a slew of folks"

* tag 'for-4.19/block-20180812' of git://git.kernel.dk/linux-block: (190 commits)
  blkcg: Make blkg_root_lookup() work for queues in bypass mode
  bcache: fix error setting writeback_rate through sysfs interface
  null_blk: add lock drop/acquire annotation
  Blk-throttle: reduce tail io latency when iops limit is enforced
  block: paride: pd: mark expected switch fall-throughs
  block: Ensure that a request queue is dissociated from the cgroup controller
  block: Introduce blk_exit_queue()
  blkcg: Introduce blkg_root_lookup()
  block: Remove two superfluous #include directives
  blk-mq: count the hctx as active before allocating tag
  block: bvec_nr_vecs() returns value for wrong slab
  bcache: trivial - remove tailing backslash in macro BTREE_FLAG
  bcache: make the pr_err statement used for ENOENT only in sysfs_attatch section
  bcache: set max writeback rate when I/O request is idle
  bcache: add code comments for bset.c
  bcache: fix mistaken comments in request.c
  bcache: fix mistaken code comments in bcache.h
  bcache: add a comment in super.c
  bcache: avoid unncessary cache prefetch bch_btree_node_get()
  bcache: display rate debug parameters to 0 when writeback is not running
  ...
2018-08-14 10:23:25 -07:00
Steven Rostedt (VMware) 016f8ffc48 uprobes: Use synchronize_rcu() not synchronize_sched()
While debugging another bug, I was looking at all the synchronize*()
functions being used in kernel/trace, and noticed that trace_uprobes was
using synchronize_sched(), with a comment to synchronize with
{u,ret}_probe_trace_func(). When looking at those functions, the data is
protected with "rcu_read_lock()" and not with "rcu_read_lock_sched()". This
is using the wrong synchronize_*() function.

Link: http://lkml.kernel.org/r/20180809160553.469e1e32@gandalf.local.home

Cc: stable@vger.kernel.org
Fixes: 70ed91c6ec ("tracing/uprobes: Support ftrace_event_file base multibuffer")
Acked-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2018-08-10 15:32:28 -04:00