Pavel Tatashin fe9af81e52 x86/tsc: Redefine notsc to behave as tsc=unstable ... Currently, the notsc kernel parameter disables the use of the TSC by sched_clock(). However, this parameter does not prevent the kernel from accessing tsc in other places. The only rationale to boot with notsc is to avoid timing discrepancies on multi-socket systems where TSC are not properly synchronized, and thus exclude TSC from being used for time keeping. But that prevents using TSC as sched_clock() as well, which is not necessary as the core sched_clock() implementation can handle non synchronized TSC based sched clocks just fine. However, there is another method to solve the above problem: booting with tsc=unstable parameter. This parameter allows sched_clock() to use TSC and just excludes it from timekeeping. So there is no real reason to keep notsc, but for compatibility reasons the parameter has to stay. Make it behave like 'tsc=unstable' instead. [ tglx: Massaged changelog ] Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Dou Liyang <douly.fnst@cn.fujitsu.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Cc: steven.sistare@oracle.com Cc: daniel.m.jordan@oracle.com Cc: linux@armlinux.org.uk Cc: schwidefsky@de.ibm.com Cc: heiko.carstens@de.ibm.com Cc: john.stultz@linaro.org Cc: sboyd@codeaurora.org Cc: hpa@zytor.com Cc: peterz@infradead.org Cc: prarit@redhat.com Cc: feng.tang@intel.com Cc: pmladek@suse.com Cc: gnomes@lxorguk.ukuu.org.uk Cc: linux-s390@vger.kernel.org Cc: boris.ostrovsky@oracle.com Cc: jgross@suse.com Cc: pbonzini@redhat.com Link: https://lkml.kernel.org/r/20180719205545.16512-12-pasha.tatashin@oracle.com		2018-07-20 00:02:39 +02:00
..
ABI	ABI: sysfs-devices-system-cpu: remove a broken reference	2018-06-15 18:10:01 -03:00
EDID	…
PCI	PCI/AER: Handle ERR_FATAL with removal and re-enumeration of devices	2018-05-17 16:44:13 -05:00
RCU	doc: Ensure whatisRCU.txt actually says what RCU is	2018-05-15 10:28:12 -07:00
accelerators	ocxl: Document new OCXL IOCTLs	2018-06-03 20:40:33 +10:00
accounting	…
acpi	ACPI / Documentation: update ACPI customize method feature docs	2018-06-06 08:48:00 +02:00
admin-guide	x86/tsc: Redefine notsc to behave as tsc=unstable	2018-07-20 00:02:39 +02:00
aoe	…
arm	ARM: Device-tree updates	2018-06-11 17:57:38 -07:00
arm64	ARM:	2018-04-09 11:42:31 -07:00
auxdisplay	Doc: misc-devices: move lcd-panel-cgram.txt to auxdisplay/	2018-04-12 16:08:02 +02:00
backlight	…
block	block: remov blk_queue_invalidate_tags	2018-06-15 08:13:35 -06:00
blockdev	zram: introduce zram memory tracking	2018-06-07 17:34:34 -07:00
bpf	bpf, doc: howto use/run the BPF selftests	2018-05-14 23:02:58 -07:00
bus-devices	…
cdrom	…
cgroup-v1	page cache: use xa_lock	2018-04-11 10:28:39 -07:00
cma	…
connector	…
console	…
core-api	Fix Documentation build due to rename of main.c to mtrr.c	2018-06-18 13:41:45 +09:00
cpu-freq	cpufreq: Drop cpufreq_table_validate_and_show()	2018-04-10 08:40:45 +02:00
cpuidle	cpuidle: Add definition of residency to sysfs documentation	2018-04-09 13:44:37 +02:00
crypto	docs: crypto_engine.rst: Fix two parse warnings	2018-06-15 12:48:59 -03:00
dev-tools	doc: dev-tools: kselftest.rst: update contributing new tests	2018-04-27 16:56:15 -06:00
device-mapper	dm: add writecache target	2018-06-08 11:59:51 -04:00
devicetree	DeviceTree fixes for 4.18:	2018-07-18 16:19:36 -07:00
doc-guide	MAINTAINERS & files: Canonize the e-mails I use at files	2018-05-04 06:21:06 -04:00
driver-api	Move all the dma-mapping code to kernel/dma	2018-06-20 16:30:01 +09:00
driver-model	…
early-userspace	…
extcon	…
fault-injection	…
fb	…
features	Kbuild: rename HAVE_CC_STACKPROTECTOR config variable	2018-06-15 07:15:28 +09:00
filesystems	Revert changes to convert to ->poll_mask() and aio IOCB_CMD_POLL	2018-06-28 10:40:47 -07:00
firmware_class	…
fmc	…
gpio	…
gpu	Merge remote-tracking branch 'drm/drm-next' into drm-misc-next	2018-05-11 18:08:10 +02:00
hid	…
hwmon	docs: Fix more broken references	2018-06-15 18:11:26 -03:00
i2c	Merge branch 'i2c/for-4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux	2018-06-14 16:21:46 +09:00
ia64	…
ide	…
iio	…
infiniband	…
input	…
ioctl	SCSI misc on 20180610	2018-06-10 13:01:12 -07:00
isdn	…
kbuild	kbuild: document the KBUILD_KCONFIG env. variable	2018-07-06 22:04:01 +09:00
kdump	…
kernel-hacking	…
laptops	platform/x86: thinkpad_acpi: silence HKEY 0x6032, 0x60f0, 0x6030	2018-05-07 15:10:31 +03:00
leds	…
lightnvm	…
livepatch	livepatch: Remove not longer valid limitations from the documentation	2018-05-24 15:37:57 +02:00
locking	…
m68k	…
maintainer	docs: Fix more broken references	2018-06-15 18:11:26 -03:00
md	…
media	media: cec: improve cec status documentation	2018-05-25 15:34:50 -04:00
memory-devices	…
mic	…
mips	…
misc-devices	Mostly small fixes and cleanups, plus a non-trivial fix for charlcd	2018-06-07 14:01:16 -07:00
mmc	…
mtd	…
namespaces	…
netlabel	…
networking	bonding: Fix a typo in bonding.txt	2018-07-16 13:32:12 -07:00
nfc	…
nios2	…
nvdimm	…
nvmem	…
openrisc	…
parisc	…
pcmcia	…
perf	…
phy	…
platform	…
power	firmware: Fix firmware documentation for recent file renames	2018-04-23 13:03:26 +02:00
powerpc	…
pps	…
process	There's been a fair amount of work in the docs tree this time around,	2018-06-04 12:34:27 -07:00
pti	…
ptp	…
rapidio	…
riscv	perf: riscv: Add Document for Future Porting Guide	2018-06-04 14:02:11 -07:00
s390	…
scheduler	sched/deadline/Documentation: Add overrun signal and GRUB-PA documentation	2018-05-14 09:12:27 +02:00
scsi	block: remove BLK_EH_HANDLED	2018-05-29 08:59:21 -06:00
security	Kbuild: rename CC_STACKPROTECTOR[_STRONG] config variables	2018-06-14 12:21:18 +09:00
serial	…
sh	…
sound	sound updates for 4.18	2018-06-06 09:08:38 -07:00
sparc	…
sphinx	Documentation: rstFlatTable.py: fix a broken reference	2018-06-15 18:10:01 -03:00
sphinx-static	…
spi	…
sysctl	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2018-06-06 18:39:49 -07:00
target	…
thermal	…
timers	…
trace	tracing: Fix some errors in histogram documentation	2018-06-21 15:12:44 -04:00
translations	fix a series of Documentation/ broken file name references	2018-06-15 18:10:01 -03:00
usb	doc: usb: Fix typo in gadget_configfs documentation	2018-06-18 12:41:00 +03:00
userspace-api	audit/stable-4.18 PR 20180605	2018-06-06 16:34:00 -07:00
virtual	KVM: fix KVM_CAP_HYPERV_TLBFLUSH paragraph number	2018-06-22 17:30:20 +02:00
vm	docs/vm: move ksm and transhuge from "user" to "internals" section.	2018-05-29 06:45:55 -06:00
w1	…
watchdog	…
wimax	…
x86	x86/tsc: Redefine notsc to behave as tsc=unstable	2018-07-20 00:02:39 +02:00
xtensa	…
.gitignore	…
00-INDEX	docs: admin-guide: add cgroup-v2 documentation	2018-05-10 15:42:41 -06:00
Changes	…
CodingStyle	…
DMA-API-HOWTO.txt	…
DMA-API.txt	…
DMA-ISA-LPC.txt	…
DMA-attributes.txt	…
IPMI.txt	…
IRQ-affinity.txt	…
IRQ-domain.txt	…
IRQ.txt	…
Intel-IOMMU.txt	…
Makefile	…
SAK.txt	…
SM501.txt	…
SubmittingPatches	…
atomic_bitops.txt	…
atomic_t.txt	…
bt8xxgpio.txt	…
btmrvl.txt	…
bus-virt-phys-mapping.txt	…
clearing-warn-once.txt	…
conf.py	…
cpu-load.txt	…
cputopology.txt	…
crc32.txt	…
dcdbas.txt	…
debugging-modules.txt	…
debugging-via-ohci1394.txt	…
dell_rbu.txt	Documentation: remove stale firmware API reference	2018-05-14 16:44:41 +02:00
digsig.txt	…
docutils.conf	…
dontdiff	…
efi-stub.txt	…
eisa.txt	…
flexible-arrays.txt	…
futex-requeue-pi.txt	…
gcc-plugins.txt	…
highuid.txt	…
hw_random.txt	…
hwspinlock.txt	…
index.rst	docs/vm: add index.rst and link MM documentation to top level index	2018-04-16 14:18:15 -06:00
intel_txt.txt	…
io-mapping.txt	…
io_ordering.txt	…
iostats.txt	…
irqflags-tracing.txt	…
isa.txt	…
isapnp.txt	…
kernel-per-CPU-kthreads.txt	…
kobject.txt	…
kprobes.txt	docs: Fix some broken references	2018-06-15 18:10:01 -03:00
kref.txt	…
ldm.txt	…
lockup-watchdogs.txt	…
logo.gif	…
logo.txt	…
lsm.txt	…
lzo.txt	…
mailbox.txt	…
memory-barriers.txt	Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-06-04 16:40:11 -07:00
memory-hotplug.txt	…
men-chameleon-bus.txt	…
nommu-mmap.txt	…
ntb.txt	…
numastat.txt	…
padata.txt	…
parport-lowlevel.txt	…
percpu-rw-semaphore.txt	…
phy.txt	…
pi-futex.txt	…
pnp.txt	…
preempt-locking.txt	…
pwm.txt	…
rbtree.txt	…
remoteproc.txt	…
rfkill.txt	…
robust-futex-ABI.txt	…
robust-futexes.txt	…
rpmsg.txt	…
rtc.txt	…
sgi-ioc4.txt	…
siphash.txt	…
smsc_ece1099.txt	…
speculation.txt	…
static-keys.txt	…
svga.txt	…
switchtec.txt	…
sync_file.txt	…
tee.txt	…
this_cpu_ops.txt	…
unaligned-memory-access.txt	…
vfio-mediated-device.txt	vfio/mdev: Check globally for duplicate devices	2018-06-08 10:24:27 -06:00
vfio.txt	vfio: fix documentation	2018-05-08 09:16:41 -06:00
video-output.txt	…
xillybus.txt	…
xz.txt	…
zorro.txt	…