Commit Graph

131993 Commits

Author SHA1 Message Date
Steven Rostedt 3d7ba938da tracing: add subsystem sched for sched events
Add the TRACE_SYSTEM sched for the sched events.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
2009-02-28 03:06:31 -05:00
Steven Rostedt 0ec2ef1505 tracing: add subsystem irq for irq events
Add the TRACE_SYSTEM irq for the irq events.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
2009-02-28 03:06:13 -05:00
Steven Rostedt b628b3e629 tracing: make the set_event and available_events subsystem aware
This patch makes the event files, set_event and available_events
aware of the subsystem.

Now you can enable an entire subsystem with:

  echo 'irq:*' > set_event

Note: the '*' is not needed.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
2009-02-28 03:05:40 -05:00
Steven Rostedt 6ecc2d1ca3 tracing: add subsystem level to trace events
If a trace point header defines TRACE_SYSTEM, then it will add the
following trace points into that event system.

If include/trace/irq_event_types.h has:

 #define TRACE_SYSTEM irq

at the top and

 #undef TRACE_SYSTEM

at the bottom, then a directory "irq" will be created in the
/debug/tracing/events directory. Inside that directory will contain the
two trace points that are defined in include/trace/irq_event_types.h.

Only adding the above to irq and not to sched, we get:

 # ls /debug/tracing/events/
irq                     sched_process_exit  sched_signal_send  sched_wakeup_new
sched_kthread_stop      sched_process_fork  sched_switch
sched_kthread_stop_ret  sched_process_free  sched_wait_task
sched_migrate_task      sched_process_wait  sched_wakeup

 # ls /debug/tracing/events/irq
irq_handler_entry  irq_handler_exit

If we add #define TRACE_SYSTEM sched to the trace/sched_event_types.h
then the rest of the trace events will be put in a sched directory
within the events directory.

I've been playing with this idea of the subsystem for a while, but
recently Tom Zanussi posted some patches to lkml that included this
method. Tom's approach was clean and got me to finally put some effort
to clean up the event trace points.

Thanks to Tom Zanussi for demonstrating how nice the subsystem
method is.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
2009-02-28 02:59:43 -05:00
Steven Rostedt eb594e45f6 tracing: move trace point formats to files in include/trace directory
Impact: clean up

To further facilitate the ease of adding trace points for developers, this
patch creates include/trace/trace_events.h and
include/trace/trace_event_types.h.

The former file will hold the trace/<type>.h files and the latter will hold
the trace/<type>_event_types.h files.

To create new tracepoints and to have them automatically
appear in the event tracer, a developer makes the trace/<type>.h file
which includes <linux/tracepoint.h> and the trace/<type>_event_types.h file.

The trace/<type>_event_types.h file will hold the TRACE_FORMAT
macros.

Then add the trace/<type>.h file to trace/trace_events.h,
and add the trace/<type>_event_types.h to the trace_event_types.h file.

No need to modify files elsewhere.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
2009-02-28 02:58:50 -05:00
Steven Rostedt 0cfe82451d tracing: replace kzalloc with kcalloc
Impact: clean up

kcalloc is a better approach to allocate a NULL array.

Reported-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
2009-02-27 10:51:10 -05:00
Steven Rostedt 5c6a3ae1b4 tracing: use newline separator for trace options list
Impact: clean up

Instead of listing the trace options like:

 # cat /debug/tracing/trace_options
print-parent nosym-offset nosym-addr noverbose noraw nohex nobin noblock nostacktrace nosched-tree ftrace_printk noftrace_preempt nobranch annotate nouserstacktrace nosym-userobj

We now list them like:

 # cat /debug/tracing/trace_options
print-parent
nosym-offset
nosym-addr
noverbose
noraw
nohex
nobin
noblock
nostacktrace
nosched-tree
ftrace_printk
noftrace_preempt
nobranch
annotate
nouserstacktrace
nosym-userobj

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
2009-02-27 00:22:21 -05:00
Steven Rostedt 85a2f9b46f tracing: use pointer error returns for __tracing_open
Impact: fix compile warning and clean up

When I first wrote __tracing_open, instead of passing the error
code via the ERR_PTR macros, I lazily used a separate parameter
to hold the return for errors.

When Frederic Weisbecker updated that function, he used the Linux
kernel ERR_PTR for the returns. This caused the parameter return
to possibly not be initialized on error. gcc correctly pointed this
out with a warning.

This patch converts the entire function to use the Linux kernel
ERR_PTR macro methods.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
2009-02-27 00:12:38 -05:00
Steven Rostedt d8e83d26b5 tracing: add protection around open use of current_tracer
Impact: fix to possible race conditions

There's some uses of current_tracer that is not protected by the
trace_types_lock. There is a small chance that a sysadmin changes
the tracer while the current_tracer is being referenced.

If the race is hit, it is unlikely to cause any harm since the
tracers are constant and are not freed. But some strang side
effects may occur.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
2009-02-26 23:55:58 -05:00
Steven Rostedt 577b785f55 tracing: add tracer dependent options to options directory
This patch adds the tracer dependent options dynamically to the
options directory when the tracer is activated. These options are
removed when the tracer is deactivated.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
2009-02-26 23:43:05 -05:00
Steven Rostedt a825907507 tracing: add options directory and core option files
This patch creates an options directory in the debugfs, that contains
the available tracing options. These files contain 1 or 0, where 1
is the option is enabled and 0 it is disabled.

Simply echoing in 1 will enable the option and 0 will disable it.
This patch only contains the core options, not the tracer options.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
2009-02-26 22:22:46 -05:00
Ingo Molnar 5d0859cef2 Merge branch 'sched/clock' into tracing/ftrace
Conflicts:
	kernel/sched_clock.c
2009-02-26 21:21:59 +01:00
Ingo Molnar 83ce400928 x86: set X86_FEATURE_TSC_RELIABLE
If the TSC is constant and non-stop, also set it reliable.

(We will turn this off in DMI quirks for multi-chassis systems)

The performance number on a 16-way Nehalem system running
32 tasks that context-switch between each other is significant:

   sched_clock_stable=0		sched_clock_stable=1
   ....................         ....................
   22.456925 million/sec        24.306972 million/sec   [+8.2%]

lmbench's "lat_ctx -s 0 2" goes from 0.63 microseconds to
0.59 microseconds - a 6.7% increase in context-switching
performance.

Perfstat of 1 million pipe context switches between two tasks:

 Performance counter stats for './pipe-test-1m':

       [before]           [after]
   ............      ............
   37621.421089      36436.848378    task clock ticks     (msecs)

              0                 0    CPU migrations       (events)
        2000274           2000189    context switches     (events)
            194               193    pagefaults           (events)
     8433799643        8171016416    CPU cycles           (events) -3.21%
     8370133368        8180999694    instructions         (events) -2.31%
        4158565           3895941    cache references     (events) -6.74%
          44312             46264    cache misses         (events)

    2349.287976       2279.362465    wall-time            (msecs)  -3.06%

The speedup comes straight from the reduction in the instruction
count. sched_clock_cpu() got simpler and the whole workload thus
executes faster.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-02-26 21:20:25 +01:00
Ingo Molnar b342501cd3 sched: allow architectures to specify sched_clock_stable
Allow CONFIG_HAVE_UNSTABLE_SCHED_CLOCK architectures to still specify
that their sched_clock() implementation is reliable.

This will be used by x86 to switch on a faster sched_clock_cpu()
implementation on certain CPU types.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-02-26 21:20:22 +01:00
Ingo Molnar 14131f2f98 tracing: implement trace_clock_*() APIs
Impact: implement new tracing timestamp APIs

Add three trace clock variants, with differing scalability/precision
tradeoffs:

 -   local: CPU-local trace clock
 -  medium: scalable global clock with some jitter
 -  global: globally monotonic, serialized clock

Make the ring-buffer use the local trace clock internally.

Acked-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-02-26 18:44:06 +01:00
Ingo Molnar 6409c4da28 sched: sched_clock() improvement: use in_nmi()
make sure we dont execute more complex sched_clock() code in NMI context.

Acked-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-02-26 18:44:05 +01:00
Jason Baron af39241b90 tracing, genirq: add irq enter and exit trace events
Impact: add new tracepoints

Add them to the generic IRQ code, that way every architecture
gets these new tracepoints, not just x86.

Using Steve's new 'TRACE_FORMAT', I can get function graph
trace as follows using the original two IRQ tracepoints:

 3)               |    handle_IRQ_event() {
 3)               |    /* (irq_handler_entry) irq=28 handler=eth0 */
 3)               |    e1000_intr_msi() {
 3)   2.460 us    |      __napi_schedule();
 3)   9.416 us    |    }
 3)               |    /* (irq_handler_exit) irq=28 handler=eth0 return=handled */
 3) + 22.935 us   |  }

Signed-off-by: Jason Baron <jbaron@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Mathieu Desnoyers <compudj@krystal.dyndns.org>
Cc: "Frank Ch. Eigler" <fche@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-02-26 18:43:50 +01:00
Frederic Weisbecker 8656e7a2fa tracing/core: make the per cpu trace files in per cpu directories
Impact: restructure the VFS layout of per CPU trace buffers

The per cpu trace files are all in a single directory:
/debug/tracing/per_cpu. In case of a large number of cpu, the
content of this directory becomes messy so we create now one
directory per cpu inside /debug/tracing/per_cpu which contain
each their own trace_pipe and trace files.

Ie:

 /debug/tracing$ ls -R per_cpu
 per_cpu:
 cpu0  cpu1

 per_cpu/cpu0:
 trace  trace_pipe

 per_cpu/cpu1:
 trace  trace_pipe

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-02-26 14:04:08 +01:00
Ingo Molnar f4abfb8d0d Merge branch 'tip/tracing/ftrace' of ssh://master.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace into tracing/ftrace 2009-02-26 03:48:44 +01:00
Ingo Molnar e36b1e136a Merge branches 'tracing/ftrace', 'tracing/hw-branch-tracing' and 'linus' into tracing/core 2009-02-26 03:47:27 +01:00
Steven Rostedt 3cdfdf91fc tracing: wrap arguments with PARAMS
Peter Zijlstra warned that TPPROTO and TPARGS might become something
other than a simple copy of itself. To prevent this from having
side effects in the TRACE_FORMAT macro in tracepoint.h, we add a
PARAMS() macro to be defined as just a wrapper.

Reported-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
2009-02-25 21:44:26 -05:00
Steven Rostedt eef62a6826 tracing: rename DEFINE_TRACE_FMT to just TRACE_FORMAT
There's been a bit confusion to whether DEFINE/DECLARE_TRACE_FMT should
be a DEFINE or a DECLARE. Ingo Molnar suggested simply calling it
TRACE_FORMAT.

Reported-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
2009-02-25 21:44:22 -05:00
Frederic Weisbecker d7350c3f45 tracing/core: make the read callbacks reentrants
Now that several per-cpu files can be read or spliced at the
same, we want the read/splice callbacks for tracing files to be
reentrants.

Until now, a single global mutex (trace_types_lock) serialized
the access to tracing_read_pipe(), tracing_splice_read_pipe(),
and the seq helpers.

Ie: it means that if a user tries to read trace_pipe0 and
trace_pipe1 at the same time, the access to the function
tracing_read_pipe() is contended and one reader must wait for
the other to finish its read call.

The trace_type_lock mutex is mostly here to serialize the access
to the global current tracer (current_trace), which can be
changed concurrently. Although the iter struct keeps a private
pointer to this tracer, its callbacks can be changed by another
function.

The method used here is to not keep anymore private reference to
the tracer inside the iterator but to make a copy of it inside
the iterator. Then it checks on subsequents read calls if the
tracer has changed. This is not costly because the current
tracer is not expected to be changed often, so we use a branch
prediction for that.

Moreover, we add a private mutex to the iterator (there is one
iterator per file descriptor) to serialize the accesses in case
of multiple consumers per file descriptor (which would be a
silly idea from the user). Note that this is not to protect the
ring buffer, since the ring buffer already serializes the
readers accesses. This is to prevent from traces weirdness in
case of concurrent consumers. But these mutexes can be dropped
anyway, that would not result in any crash. Just tell me what
you think about it.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-02-25 13:40:58 +01:00
Frederic Weisbecker b04cc6b1f6 tracing/core: introduce per cpu tracing files
Impact: split up tracing output per cpu

Currently, on the tracing debugfs directory, three files are
available to the user to let him extracting the trace output:

- trace is an iterator through the ring-buffer. It's a reader
  but not a consumer It doesn't block when no more traces are
  available.

- trace pretty similar to the former, except that it adds more
  informations such as prempt count, irq flag, ...

- trace_pipe is a reader and a consumer, it will also block
  waiting for traces if necessary (heh, yes it's a pipe).

The traces coming from different cpus are curretly mixed up
inside these files. Sometimes it messes up the informations,
sometimes it's useful, depending on what does the tracer
capture.

The tracing_cpumask file is useful to filter the output and
select only the traces captured a custom defined set of cpus.
But still it is not enough powerful to extract at the same time
one trace buffer per cpu.

So this patch creates a new directory: /debug/tracing/per_cpu/.

Inside this directory, you will now find one trace_pipe file and
one trace file per cpu.

Which means if you have two cpus, you will have:

 trace0
 trace1
 trace_pipe0
 trace_pipe1

And of course, reading these files will have the same effect
than with the usual tracing files, except that you will only see
the traces from the given cpu.

The original all-in-one cpu trace file are still available on
their original place.

Until now, only one consumer was allowed on trace_pipe to avoid
racy consuming on the ring-buffer. Now the approach changed a
bit, you can have only one consumer per cpu.

Which means you are allowed to read concurrently trace_pipe0 and
trace_pipe1 But you can't have two readers on trace_pipe0 or
trace_pipe1.

Following the same logic, if there is one reader on the common
trace_pipe, you can not have at the same time another reader on
trace_pipe0 or in trace_pipe1. Because in trace_pipe is already
a consumer in all cpu buffers in essence.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-02-25 13:40:58 +01:00
Ingo Molnar 2b1b858f69 Merge branch 'tip/tracing/ftrace' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace into tracing/ftrace 2009-02-25 12:50:07 +01:00
Ingo Molnar 886b5b73d7 tracing: remove /debug/tracing/latency_trace
Impact: remove old debug/tracing API

/debug/tracing/latency_trace is an old legacy format we kept from
the old latency tracer. Remove the file for now. If there's any
useful bit missing then we'll propagate any useful output bits into
the /debug/tracing/trace output.

Reported-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-02-25 11:05:34 +01:00
Ingo Molnar 2d542cf342 tracing/hw-branch-tracing: convert bts-tracer mutex to a spinlock
Impact: fix CPU hotplug lockup

bts_hotcpu_handler() is called with irqs disabled, so using mutex_lock()
is a no-no.

All the BTS codepaths here are atomic (they do not schedule), so using
a spinlock is the right solution.

Cc: Markus Metzger <markus.t.metzger@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-02-25 09:16:01 +01:00
Steven Rostedt 1473e4417c tracing: make event directory structure
This patch adds the directory /debug/tracing/events/ that will contain
all the registered trace points.

 # ls /debug/tracing/events/
sched_kthread_stop      sched_process_fork  sched_switch
sched_kthread_stop_ret  sched_process_free  sched_wait_task
sched_migrate_task      sched_process_wait  sched_wakeup
sched_process_exit      sched_signal_send   sched_wakeup_new

 # ls /debug/tracing/events/sched_switch/
enable

 # cat /debug/tracing/events/sched_switch/enable
1

 # cat /debug/tracing/set_event
sched_switch

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
2009-02-24 21:54:08 -05:00
Steven Rostedt f3fe8e4a38 tracing: add schedule events to event trace
This patch changes the trace/sched.h to use the DECLARE_TRACE_FMT
such that they are automatically registered with the event tracer.

And it also adds the tracing sched headers to kernel/trace/events.c

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
2009-02-24 21:54:07 -05:00
Steven Rostedt b77e38aa24 tracing: add event trace infrastructure
This patch creates the event tracing infrastructure of ftrace.
It will create the files:

 /debug/tracing/available_events
 /debug/tracing/set_event

The available_events will list the trace points that have been
registered with the event tracer.

set_events will allow the user to enable or disable an event hook.

example:

 # echo sched_wakeup > /debug/tracing/set_event

Will enable the sched_wakeup event (if it is registered).

 # echo "!sched_wakeup" >> /debug/tracing/set_event

Will disable the sched_wakeup event (and only that event).

 # echo > /debug/tracing/set_event

Will disable all events (notice the '>')

 # cat /debug/tracing/available_events > /debug/tracing/set_event

Will enable all registered event hooks.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
2009-02-24 21:54:05 -05:00
Steven Rostedt 7c37730cd3 tracing: add DEFINE_TRACE_FMT to tracepoint.h
This patch creates a DEFINE_TRACE_FMT to map to DECLARE_TRACE.
This allows for the developers to place format strings and
args in with their tracepoint declaration. A tracer may now
override the DEFINE_TRACE_FMT macro and use it to record
a default format.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
2009-02-24 21:53:32 -05:00
Linus Torvalds 694593e337 Merge branch 'proc-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/adobriyan/proc
* 'proc-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/adobriyan/proc:
  proc: fix PG_locked reporting in /proc/kpageflags
2009-02-24 15:42:08 -08:00
Linus Torvalds 21209b61b0 Merge branch 'i2c-for-linus' of git://jdelvare.pck.nerim.net/jdelvare-2.6
* 'i2c-for-linus' of git://jdelvare.pck.nerim.net/jdelvare-2.6:
  Add i2c_board_info for RiscPC PCF8583
  i2c: Make sure i2c_algo_bit_data.timeout is HZ-independent
  i2c-dev: Clarify the unit of ioctl I2C_TIMEOUT
  i2c: Timeouts reach -1
  i2c: Fix misplaced parentheses
2009-02-24 15:40:19 -08:00
Linus Torvalds a792cd12cf Merge branch 'firedtv-merge' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6
* 'firedtv-merge' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6:
  firedtv: dvb_frontend_info for FireDTV S2, fix "frequency limits undefined" error
  firedtv: massive refactoring
  firedtv: rename files, variables, functions from firesat to firedtv
  firedtv: Use DEFINE_SPINLOCK
  firedtv: fix registration - adapter number could only be zero
  firedtv: use length_field() of PMT as length
  firedtv: fix returned struct for ca_info
  firedtv: cleanups and minor fixes
  ieee1394: remove superfluous assertions
  ieee1394: inherit ud vendor_id from node vendor_id
  ieee1394: add hpsb_node_read() and hpsb_node_lock()
  ieee1394: use correct barrier types between accesses of nodeid and generation
  firesat: copyrights, rename to firedtv, API conversions, fix remote control input
  firesat: avc resend
  firesat: update isochronous interface, add CI support
  firesat: add DVB-S support for DVB-S2 devices
  firesat: fix DVB-S2 device recognition
  DVB: add firesat driver
2009-02-24 15:39:54 -08:00
Linus Torvalds 4daa0682af Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  ext4: Fix deadlock in ext4_write_begin() and ext4_da_write_begin()
  ext4: Add fallback for find_group_flex
2009-02-24 15:39:34 -08:00
Russell King 531660ef56 Add i2c_board_info for RiscPC PCF8583
Add the necessary i2c_board_info structure to fix the lack of PCF8583
RTC on RiscPC.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Alessandro Zummo <a.zummo@towertech.it>
2009-02-24 19:19:50 +01:00
Jean Delvare 082a4cf809 i2c: Make sure i2c_algo_bit_data.timeout is HZ-independent
i2c_algo_bit_data.timeout is supposed to be in jiffies, so drivers
should use set this value in terms of HZ.

Ultimately I think this field should be discarded in favor of
i2c_adapter.timeout, but that's left for a future patch.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Lennert Buytenhek <kernel@wantstofly.org>
Acked-by: Len Sorensen <lsorense@csclub.uwaterloo.ca>
2009-02-24 19:19:49 +01:00
Jean Delvare cd97f39b7c i2c-dev: Clarify the unit of ioctl I2C_TIMEOUT
The unit in which user-space can set the bus timeout value is jiffies
for historical reasons (back when HZ was always 100.) This is however
not good because user-space doesn't know how long a jiffy lasts. The
timeout value should instead be set in a fixed time unit. Given the
original value of HZ, this unit should be 10 ms, for compatibility.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Wolfram Sang <w.sang@pengutronix.de>
2009-02-24 19:19:49 +01:00
Roel Kluin a746b578d8 i2c: Timeouts reach -1
With a postfix decrement these timeouts reach -1 rather than 0, but
after the loop it is tested whether they have become 0.

As pointed out by Jean Delvare, the condition we are waiting for should
also be tested before the timeout. With the current order, you could
exit with a timeout error while the job is actually done.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2009-02-24 19:19:48 +01:00
Roel Kluin f29d2e0275 i2c: Fix misplaced parentheses
Fix misplaced parentheses.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2009-02-24 19:19:48 +01:00
Helge Bahmann e07a4b9217 proc: fix PG_locked reporting in /proc/kpageflags
Expr always evaluates to zero.

Cc: Matt Mackall <mpm@selenic.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
2009-02-24 21:17:58 +03:00
Markus Metzger 499aa86dcb x86, ptrace: remove CONFIG guards around declarations
Remove unnecessary CONFIG guards around type declarations and macro
definitions.

Reported-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
Cc: markus.t.metzger@gmail.com
Cc: roland@redhat.com
Cc: eranian@googlemail.com
Cc: oleg@redhat.com
Cc: juan.villacis@intel.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-02-24 18:23:35 +01:00
Markus Metzger 5e01cb695d x86, ftrace: fix section mismatch in hw-branch-tracer
Fix an invalid memory reference problem when cpu hotplug support is
disabled and the hw-branch-tracer is set as current tracer.

Initializing the tracer calls bts_trace_init() which has already
been freed at this time.

Reported-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-02-24 18:23:34 +01:00
Ingo Molnar a7f4463e03 Merge branch 'tracing/ftrace'; commit 'v2.6.29-rc6' into tracing/core 2009-02-24 18:22:39 +01:00
Beat Michel Liechti e73bf9f135 firedtv: dvb_frontend_info for FireDTV S2, fix "frequency limits undefined" error
I found that the function fdtv_frontend_init in the file firedtv-fe.c was
missing a case for FIREDTV_DVB_S2 which resulted in "frequency limits
undefined" errors in syslog.

Signed-off-by: Beat Michel Liechti <bml303@gmail.com>

Change by Stefan R: combine it with case case FIREDTV_DVB_S as
originally suggested by Beat Michel.  This enables FE_CAN_FEC_AUTO also
for FireDTV-S2 devices which is possible as long as only DVB-S channels
are used.  FE_CAN_FEC_AUTO would be wrong for DVB-S2 channels, but those
cannot be used yet since the driver is not yet converted to S2API.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-02-24 17:58:23 +01:00
Stefan Richter 154907957f firedtv: massive refactoring
Combination of the following changes:

Mon, 23 Feb 2009 14:21:10 +0100 (CET)
firedtv: reinstate debug logging option

    Henrik Kurelid tells me that FCP debug logging (which I removed during
    cleanups) is still useful when working on driver issues together with
    end users.  So bring it back in an updated form with only 60% of the
    original code footprint.

    Logging can be enabled with
    # echo -1 > /sys/module/firedtv/parameters/debug

    1 instead of -1 enables only FCP header logging,
    2 instead of -1 enables only hexdumps of the entire FCP frames.
    0 switches logging off again.

Fri, 20 Feb 2009 20:54:27 +0100 (CET)
firedtv: build fix for INPUT=m and DVB_FIREDTV=y

Thu, 19 Feb 2009 20:40:39 +0100
firedtv: use msecs_to_jiffies

    Pointed out by Mauro Carvalho Chehab.

Sun Feb 15 20:50:46 CET 2009
firedtv: some more housekeeping

    Fix an old checkpatch warning and a new compiler warning.

Sun Feb 15 15:33:17 CET 2009
firedtv: rename a file once more

    At the moment, about a third of avc.c is specific to FireDTVs rather
    than generic AV/C code.  Rename it to firedtv-avc.c.

Sun Feb 15 15:33:17 CET 2009
firedtv: dvb demux: more compact channels backing store

    Replace struct firedtv_channel { bool active; int pid; } channel[16];
    by unsigned long channel_active; u16 channel_pid[16];.

Sun Feb 15 15:33:17 CET 2009
firedtv: dvb demux: some simplifications

    c->active was unnecessarily cleared twice.

    Also, by marking the channel inactive before the for loop,
    the loop becomes identical with fdtv_channel_collect().

Sun Feb 15 15:33:17 CET 2009
firedtv: dvb demux: remove a bogus loop

    This loop is unnecessary because
      - only active channel[].pid's will be sent to the device,
      - when a channel is activated, its pid is set to dvbdmxfeed->pid.

    Perhaps the original code was there because it was initially not fully
    covered by the fdtv->demux_mutex.

Sun Feb 15 15:33:17 CET 2009
firedtv: dvb demux: fix mutex protection

    fdtv_start_feed() accessed the channel list unsafely.
    Fully serialize it with itself and fdtv_stop_feed().

Sun Feb 15 15:33:17 CET 2009
firedtv: dvb demux: fix missing braces

    Original code was:
            ...
            case DMX_TS_PES_OTHER:
                    //Dirty fix to keep firesat->channel pid-list up to date
                    for(k=0;k<16;k++){
                            if(firesat->channel[k].active == 0)
                                    firesat->channel[k].pid =
                                            dvbdmxfeed->pid;
                                    break;
                    }
                    channel = firesat_channel_allocate(firesat);
                    break;
            default:
            ...

    Looks bogus in several respects. For now let's just add braces to the if
    because that seems to be what the author meant.

Sun Feb 15 15:33:17 CET 2009
firedtv: allow build without input subsystem

    !CONFIG_INPUT is very unlikely on systems on which firedtv is of
    interest.  But we can easily support it.

Sun Feb 15 15:33:17 CET 2009
firedtv: replace EXTRA_CFLAGS by ccflags

    The former are deprecated.
    The latter can depend on Kconfig variables.

Sun Feb 15 15:33:17 CET 2009
firedtv: concentrate ieee1394 dependencies

    Move the entire interface with drivers/ieee1394 to firedtv-1394.c.
    Move 1394-independent module initialization code to firedtv-dvb.c.

    This prepares interfacing with drivers/firewire.

Sun Feb 15 15:33:17 CET 2009
firedtv: amend Kconfig menu prompt

Sun Feb 15 15:33:17 CET 2009
firedtv: remove kernel version compatibility macro

Sun Feb 15 15:33:17 CET 2009
firedtv: combine header files

    avc.h and firedtv-*.h are small and currently not shared with other
    drivers, hence concatenate them all into firedtv.h.

Sun Feb 15 15:33:17 CET 2009
firedtv: misc style touch-ups

    Standardize on lower-case hexadecimal constants.  Adjust whitespace.
    Omit unnecessary pointer type casts and an unnecessary list head
    initialization.  Use dev_printk.

Wed Feb 11 21:21:04 CET 2009
firedtv: avc, ci: remove unused constants

Wed Feb 11 21:21:04 CET 2009
firedtv: avc: remove bitfields from read descriptor response operands

    Don't use bitfields in struct types of on-the-wire data.

Wed Feb 11 21:21:04 CET 2009
firedtv: avc: remove bitfields from DSD command operands

    Don't use bitfields in struct types of on-the-wire data.

Wed Feb 11 21:21:04 CET 2009
firedtv: avc: header file cleanup

    Remove unused constants and declarations.
    Move privately used constants into .c files.

Wed Feb 11 21:21:04 CET 2009
firedtv: avc: remove bitfields from FCP frame types

    Don't use bitfields in struct types of on-the-wire data.

    Also move many privately used constants from avc.h to avc.c
    and remove some unused constants.

Sun, 18 Jan 2009 16:30:00 +0100 (CET)
firedtv: avc: fix offset in avc_tuner_get_ts

    The parentheses were wrong.  It didn't matter though because this code
    only writes a 0 into an area which is already initialized to 0.

Sun, 18 Jan 2009 16:30:00 +0100 (CET)
firedtv: avc: reduce stack usage, remove two typedefs

    It is safe to share a memory buffer for command frame and response frame
    because the response data come in after the command frame was last used.

    Even less stack would be required if only the actual required frame size
    instead of the entire FCP register size was allocated.

    Also, rename the defined types AVCCmdFrm and AVCRspFrm to
    struct avc_command_frame and struct avc_response_frame.
    TODO:  Remove the bitfields in these types.

Sun, 18 Jan 2009 16:30:00 +0100 (CET)
firedtv: cmp: move code to avc

Sun, 18 Jan 2009 16:30:00 +0100 (CET)
firedtv: iso: move code to firedtv-1394

Sun, 18 Jan 2009 16:30:00 +0100 (CET)
firedtv: iso: remove unnecessary struct type definitions

Sun, 18 Jan 2009 16:30:00 +0100 (CET)
firedtv: iso: style changes and fixlets

    Add cleanup after failure in setup_iso_channel.
    Replace printk() by dv_err().
    Decrease indentation level in rawiso_activity_cb().

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-02-24 14:51:29 +01:00
Rambaldi a70f81c1c0 firedtv: rename files, variables, functions from firesat to firedtv
Combination of the following changes:

Sat, 17 Jan 2009 14:47:34 +0100
firedtv: rename variables and functions from firesat to firedtv

    Signed-off-by: Rambaldi <Rambaldi@xs4all.nl>

    Additional changes by Stefan Richter:

    Renamed struct firedtv *firedtv to struct firedtv *fdtv and
    firedtv_foo_bar() to fdtv_foo_bar() for brevity.

Sat, 17 Jan 2009 13:07:44 +0100
firedtv: rename files from firesat to firedtv

    Signed-off-by: Rambaldi <Rambaldi@xs4all.nl>

    Additional changes by Stefan Richter:

    Name the directory "firewire" instead of "firedtv".
    Standardize on "-" instead of "_" in file names, because that's what
    drivers/firewire/ and drivers/media/dvb/dvb-usb/ use too.
    Build fix.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-02-24 14:51:29 +01:00
Julia Lawall 291f006efe firedtv: Use DEFINE_SPINLOCK
SPIN_LOCK_UNLOCKED is deprecated.  The following makes the change suggested
in Documentation/spinlocks.txt

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-02-24 14:51:29 +01:00
Henrik Kurelid a40bf55916 firedtv: fix registration - adapter number could only be zero
There was a bug causing the initialization to fail if adapter number was
greater than zero. The adapter was however registered which caused the driver
to oops the second time initialization was tried.

Signed-off-by: Henrik Kurelid <henrik@kurelid.se>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-02-24 14:51:28 +01:00
Henrik Kurelid 7199e523ef firedtv: use length_field() of PMT as length
Parsed and used the length_field() of the PMT message instead of using
the length field of the message struct, which does not seem to be filled
correctly by e.g. MythTV.

Signed-off-by: Henrik Kurelid <henrik@kurelid.se>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-02-24 14:51:28 +01:00