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  1. 25 1月, 2013 2 次提交
  3. 24 1月, 2013 16 次提交
  5. 23 1月, 2013 22 次提交
    • T
      ALSA: hda - Fix inconsistent pin states after resume · 31614bb8
      由 Takashi Iwai 提交于 
      The commit [26a6cb6c: ALSA: hda - Implement a poll loop for jacks as a
module parameter] introduced the polling jack detection code, but it
also moved the call of snd_hda_jack_set_dirty_all() in the resume path
after resume/init ops call.  This caused a regression when the jack
state has been changed during power-down (e.g. in the power save
mode).  Since the driver doesn't probe the new jack state but keeps
using the cached value due to no dirty flag, the pin state remains
also as if the jack is still plugged.

The fix is simply moving snd_hda_jack_set_dirty_all() to the original
position.
Reported-by: NManolo Díaz <diaz.manolo@gmail.com>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>
      31614bb8
    • S
      ring-buffer: Remove trace.h from ring_buffer.c · 0b07436d
      由 Steven Rostedt 提交于 
      ring_buffer.c use to require declarations from trace.h, but
these have moved to the generic header files. There's nothing
in trace.h that ring_buffer.c requires.

There's some headers that trace.h included that ring_buffer.c
needs, but it's best that it includes them directly, and not
include trace.h.

Also, some things may use ring_buffer.c without having tracing
configured. This removes the dependency that may come in the
future.
Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
      0b07436d
    • S
      ring-buffer: User context bit recursion checking · 567cd4da
      由 Steven Rostedt 提交于 
      Using context bit recursion checking, we can help increase the
performance of the ring buffer.

Before this patch:

 # echo function > /debug/tracing/current_tracer
 # for i in `seq 10`; do ./hackbench 50; done
Time: 10.285
Time: 10.407
Time: 10.243
Time: 10.372
Time: 10.380
Time: 10.198
Time: 10.272
Time: 10.354
Time: 10.248
Time: 10.253

(average: 10.3012)

Now we have:

 # echo function > /debug/tracing/current_tracer
 # for i in `seq 10`; do ./hackbench 50; done
Time: 9.712
Time: 9.824
Time: 9.861
Time: 9.827
Time: 9.962
Time: 9.905
Time: 9.886
Time: 10.088
Time: 9.861
Time: 9.834

(average: 9.876)

 a 4% savings!
Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
      567cd4da
    • S
      ftrace: Use only the preempt version of function tracing · 897f68a4
      由 Steven Rostedt 提交于 
      The function tracer had two different versions of function tracing.

The disabling of irqs version and the preempt disable version.

As function tracing in very intrusive and can cause nasty recursion
issues, it has its own recursion protection. But the old method to
do this was a flat layer. If it detected that a recursion was happening
then it would just return without recording.

This made the preempt version (much faster than the irq disabling one)
not very useful, because if an interrupt were to occur after the
recursion flag was set, the interrupt would not be traced at all,
because every function that was traced would think it recursed on
itself (due to the context it preempted setting the recursive flag).

Now that we have a recursion flag for every context level, we
no longer need to worry about that. We can disable preemption,
set the current context recursion check bit, and go on. If an
interrupt were to come along, it would check its own context bit
and happily continue to trace.

As the preempt version is faster than the irq disable version,
there's no more reason to keep the preempt version around.
And the irq disable version still had an issue with missing
out on tracing NMI code.

Remove the irq disable function tracer version and have the
preempt disable version be the default (and only version).

Before this patch we had from running:

 # echo function > /debug/tracing/current_tracer
 # for i in `seq 10`; do ./hackbench 50; done
Time: 12.028
Time: 11.945
Time: 11.925
Time: 11.964
Time: 12.002
Time: 11.910
Time: 11.944
Time: 11.929
Time: 11.941
Time: 11.924

(average: 11.9512)

Now we have:

 # echo function > /debug/tracing/current_tracer
 # for i in `seq 10`; do ./hackbench 50; done
Time: 10.285
Time: 10.407
Time: 10.243
Time: 10.372
Time: 10.380
Time: 10.198
Time: 10.272
Time: 10.354
Time: 10.248
Time: 10.253

(average: 10.3012)

 a 13.8% savings!
Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
      897f68a4
    • S
      tracing: Avoid unnecessary multiple recursion checks · edc15caf
      由 Steven Rostedt 提交于 
      When function tracing occurs, the following steps are made:
  If arch does not support a ftrace feature:
   call internal function (uses INTERNAL bits) which calls...
  If callback is registered to the "global" list, the list
   function is called and recursion checks the GLOBAL bits.
   then this function calls...
  The function callback, which can use the FTRACE bits to
   check for recursion.

Now if the arch does not suppport a feature, and it calls
the global list function which calls the ftrace callback
all three of these steps will do a recursion protection.
There's no reason to do one if the previous caller already
did. The recursion that we are protecting against will
go through the same steps again.

To prevent the multiple recursion checks, if a recursion
bit is set that is higher than the MAX bit of the current
check, then we know that the check was made by the previous
caller, and we can skip the current check.
Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
      edc15caf
    • S
      tracing: Make the trace recursion bits into enums · e46cbf75
      由 Steven Rostedt 提交于 
      Convert the bits into enums which makes the code a little easier
to maintain.
Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
      e46cbf75
    • S
      ftrace: Add context level recursion bit checking · c29f122c
      由 Steven Rostedt 提交于 
      Currently for recursion checking in the function tracer, ftrace
tests a task_struct bit to determine if the function tracer had
recursed or not. If it has, then it will will return without going
further.

But this leads to races. If an interrupt came in after the bit
was set, the functions being traced would see that bit set and
think that the function tracer recursed on itself, and would return.

Instead add a bit for each context (normal, softirq, irq and nmi).

A check of which context the task is in is made before testing the
associated bit. Now if an interrupt preempts the function tracer
after the previous context has been set, the interrupt functions
can still be traced.
Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
      c29f122c
    • S
      ftrace: Optimize the function tracer list loop · 0a016409
      由 Steven Rostedt 提交于 
      There is lots of places that perform:

       op = rcu_dereference_raw(ftrace_control_list);
       while (op != &ftrace_list_end) {

Add a helper macro to do this, and also optimize for a single
entity. That is, gcc will optimize a loop for either no iterations
or more than one iteration. But usually only a single callback
is registered to the function tracer, thus the optimized case
should be a single pass. to do this we now do:

	op = rcu_dereference_raw(list);
	do {
		[...]
	} while (likely(op = rcu_dereference_raw((op)->next)) &&
	       unlikely((op) != &ftrace_list_end));

An op is always registered (ftrace_list_end when no callbacks is
registered), thus when a single callback is registered, the link
list looks like:

 top => callback => ftrace_list_end => NULL.

The likely(op = op->next) still must be performed due to the race
of removing the callback, where the first op assignment could
equal ftrace_list_end. In that case, the op->next would be NULL.
But this is unlikely (only happens in a race condition when
removing the callback).

But it is very likely that the next op would be ftrace_list_end,
unless more than one callback has been registered. This tells
gcc what the most common case is and makes the fast path with
the least amount of branches.
Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
      0a016409
    • S
      ftrace: Fix function tracing recursion self test · 9640388b
      由 Steven Rostedt 提交于 
      The function tracing recursion self test should not crash
the machine if the resursion test fails. If it detects that
the function tracing is recursing when it should not be, then
bail, don't go into an infinite recursive loop.
Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
      9640388b
    • S
      ftrace: Fix global function tracers that are not recursion safe · 63503794
      由 Steven Rostedt 提交于 
      If one of the function tracers set by the global ops is not recursion
safe, it can still be called directly without the added recursion
supplied by the ftrace infrastructure.
Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
      63503794
    • S
      tracing: Fix selftest function recursion accounting · 05cbbf64
      由 Steven Rostedt 提交于 
      The test that checks function recursion does things differently
if the arch does not support all ftrace features. But that really
doesn't make a difference with how the test runs, and either way
the count variable should be 2 at the end.

Currently the test wrongly fails for archs that don't support all
the ftrace features.
Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
      05cbbf64
    • S
      tracing: Fix race with max_tr and changing tracers · 34600f0e
      由 Steven Rostedt 提交于 
      There's a race condition between the setting of a new tracer and
the update of the max trace buffers (the swap). When a new tracer
is added, it sets current_trace to nop_trace before disabling
the old tracer. At this moment, if the old tracer uses update_max_tr(),
the update may trigger the warning against !current_trace->use_max-tr,
as nop_trace doesn't have that set.

As update_max_tr() requires that interrupts be disabled, we can
add a check to see if current_trace == nop_trace and bail if it
does. Then when disabling the current_trace, set it to nop_trace
and run synchronize_sched(). This will make sure all calls to
update_max_tr() have completed (it was called with interrupts disabled).

As a clean up, this commit also removes shrinking and recreating
the max_tr buffer if the old and new tracers both have use_max_tr set.
The old way use to always shrink the buffer, and then expand it
for the next tracer. This is a waste of time.
Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
      34600f0e
    • L
      Revert "drivers/misc/ti-st: remove gpio handling" · a7e2ca17
      由 Luciano Coelho 提交于 
      This reverts commit eccf2979.

The reason is that it broke TI WiLink shared transport on Panda.
Also, callback functions should not be added to board files anymore,
so revert to implementing the power functions in the driver itself.

Additionally, changed a variable name ('status' to 'err') so that this
revert compiles properly.

Cc: stable <stable@vger.kernel.org> [3.7]
Acked-by: NTony Lindgren <tony@atomide.com>
Signed-off-by: NLuciano Coelho <coelho@ti.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      a7e2ca17
    • L
      Merge tag '3.8-pci-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci · 1d854908
      由 Linus Torvalds 提交于 
      Pull PCI updates from Bjorn Helgaas:
 "The most important is a fix for a pciehp deadlock that occurs when
  unplugging a Thunderbolt adapter.  We also applied the same fix to
  shpchp, removed CONFIG_EXPERIMENTAL dependencies, fixed a
  pcie_aspm=force problem, and fixed a refcount leak.

  Details:

   - Hotplug
      PCI: pciehp: Use per-slot workqueues to avoid deadlock
      PCI: shpchp: Make shpchp_wq non-ordered
      PCI: shpchp: Handle push button event asynchronously
      PCI: shpchp: Use per-slot workqueues to avoid deadlock

   - Power management
      PCI: Allow pcie_aspm=force even when FADT indicates it is unsupported

   - Misc
      PCI/AER: pci_get_domain_bus_and_slot() call missing required pci_dev_put()
      PCI: remove depends on CONFIG_EXPERIMENTAL"

* tag '3.8-pci-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
  PCI: remove depends on CONFIG_EXPERIMENTAL
  PCI: Allow pcie_aspm=force even when FADT indicates it is unsupported
  PCI: shpchp: Use per-slot workqueues to avoid deadlock
  PCI: shpchp: Handle push button event asynchronously
  PCI: shpchp: Make shpchp_wq non-ordered
  PCI/AER: pci_get_domain_bus_and_slot() call missing required pci_dev_put()
  PCI: pciehp: Use per-slot workqueues to avoid deadlock
      1d854908
    • T
      async: fix __lowest_in_progress() · f56c3196
      由 Tejun Heo 提交于 
      Commit 083b804c ("async: use workqueue for worker pool") made it
possible that async jobs are moved from pending to running out-of-order.
While pending async jobs will be queued and dispatched for execution in
the same order, nothing guarantees they'll enter "1) move self to the
running queue" of async_run_entry_fn() in the same order.

Before the conversion, async implemented its own worker pool.  An async
worker, upon being woken up, fetches the first item from the pending
list, which kept the executing lists sorted.  The conversion to
workqueue was done by adding work_struct to each async_entry and async
just schedules the work item.  The queueing and dispatching of such work
items are still in order but now each worker thread is associated with a
specific async_entry and moves that specific async_entry to the
executing list.  So, depending on which worker reaches that point
earlier, which is non-deterministic, we may end up moving an async_entry
with larger cookie before one with smaller one.

This broke __lowest_in_progress().  running->domain may not be properly
sorted and is not guaranteed to contain lower cookies than pending list
when not empty.  Fix it by ensuring sort-inserting to the running list
and always looking at both pending and running when trying to determine
the lowest cookie.

Over time, the async synchronization implementation became quite messy.
We better restructure it such that each async_entry is linked to two
lists - one global and one per domain - and not move it when execution
starts.  There's no reason to distinguish pending and running.  They
behave the same for synchronization purposes.
Signed-off-by: NTejun Heo <tj@kernel.org>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      f56c3196
    • L
      Merge tag 'perf-urgent-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux · ed06ef31
      由 Linus Torvalds 提交于 
      Pull perf/urgent fixes from Arnaldo Carvalho de Melo:

 . revert 20b279 - require exclude_guest to use PEBS - kernel side, now
   older binaries will continue working for things like cycles:pp
   without needing to pass extra modifiers, from David Ahern.

 . Fix building from 'make perf-*-src-pkg' tarballs, broken by UAPI,
   from Sebastian Andrzej Siewior

[ Pulling directly, Ingo would normally pull but has been unresponsive ]

* tag 'perf-urgent-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux:
  perf tools: Fix building from 'make perf-*-src-pkg' tarballs
  perf x86: revert 20b279 - require exclude_guest to use PEBS - kernel side
      ed06ef31
    • L
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux · 343391b1
      由 Linus Torvalds 提交于 
      Pull parisc fixes from Helge Deller:
 "Improve the stability of the linux kernel on the parisc architecture"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
  parisc: sigaltstack doesn't round ss.ss_sp as required
  parisc: improve ptrace support for gdb single-step
  parisc: don't claim cpu irqs more than once
  parisc: avoid undefined shift in cnv_float.h
      343391b1
    • L
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse · 262060ea
      由 Linus Torvalds 提交于 
      Pull fuse fixes from Miklos Szeredi:
 "This contain a bugfix for CUSE and miscellaneous small fixes"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse:
  fuse: remove unused variable in fuse_try_move_page()
  fuse: make fuse_file_fallocate() static
  fuse: Move CUSE Kconfig entry from fs/Kconfig into fs/fuse/Kconfig
  cuse: fix uninitialized variable warnings
  cuse: do not register multiple devices with identical names
  cuse: use mutex as registration lock instead of spinlocks
      262060ea
    • L
      Merge tag 'fixes-for-v3.8-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio · b75b25b0
      由 Linus Torvalds 提交于 
      Pull GPIO fixes from Linus Walleij:
 "Here are some GPIO fixes I stacked up in my GPIO tree:

   - Remove a bad #include from the Samsung driver
   - Some Kconfig hazzle for the Samsungs
   - Skip gpiolib registration on EXYNOS5440
   - Don't free the MVEBU label"

* tag 'fixes-for-v3.8-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio:
  gpio: mvebu: Don't free chip label memory
  gpio: samsung: skip gpio lib registration for EXYNOS5440
  gpio: samsung: silent build warning for EXYNOS5 SoCs
  gpio: samsung: fix pinctrl condition for exynos and exynos5440
  gpio: samsung: remove inclusion <mach/regs-clock.h>
      b75b25b0
    • L
      Merge tag 'f2fs-for-3.8-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs · 05c2cf35
      由 Linus Torvalds 提交于 
      Pull f2fs fixes from Jaegeuk Kim:
 o Support swap file and link generic_file_remap_pages
 o Enhance the bio streaming flow and free section control
 o Major bug fix on recovery routine
 o Minor bug/warning fixes and code cleanups

* tag 'f2fs-for-3.8-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs: (22 commits)
  f2fs: use _safe() version of list_for_each
  f2fs: add comments of start_bidx_of_node
  f2fs: avoid issuing small bios due to several dirty node pages
  f2fs: support swapfile
  f2fs: add remap_pages as generic_file_remap_pages
  f2fs: add __init to functions in init_f2fs_fs
  f2fs: fix the debugfs entry creation path
  f2fs: add global mutex_lock to protect f2fs_stat_list
  f2fs: remove the blk_plug usage in f2fs_write_data_pages
  f2fs: avoid redundant time update for parent directory in f2fs_delete_entry
  f2fs: remove redundant call to set_blocksize in f2fs_fill_super
  f2fs: move f2fs_balance_fs to punch_hole
  f2fs: add f2fs_balance_fs in several interfaces
  f2fs: revisit the f2fs_gc flow
  f2fs: check return value during recovery
  f2fs: avoid null dereference in f2fs_acl_from_disk
  f2fs: initialize newly allocated dnode structure
  f2fs: update f2fs partition info about SIT/NAT layout
  f2fs: update f2fs document to reflect SIT/NAT layout correctly
  f2fs: remove unneeded INIT_LIST_HEAD at few places
  ...
      05c2cf35
    • L
      Merge tag 'vfio-for-v3.8-rc5' of git://github.com/awilliam/linux-vfio · 3c2a9f84
      由 Linus Torvalds 提交于 
      Pull vfio fix from Alex Williamson.
 "vfio-pci: Fix buffer overfill"

* tag 'vfio-for-v3.8-rc5' of git://github.com/awilliam/linux-vfio:
  vfio-pci: Fix buffer overfill
      3c2a9f84
    • L
      Merge tag 'trace-3.8-rc4-fix' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace · d26d4525
      由 Linus Torvalds 提交于 
      Pull ftrace fix from Steven Rostedt:
 "Kprobes now uses the function tracer if it can.  That is, if a probe
  is placed on a function mcount/nop location, and the arch supports it,
  instead of adding a breakpoint, kprobes will register a function
  callback as that is much more efficient.

  The function tracer requires to update modules before they run, and
  uses the module notifier to do so.  But if something else in the
  module notifiers registers a kprobe at one of these locations, before
  ftrace can get to it, then the system could fail.

  The function tracer must be initialized early, otherwise module
  notifiers that probe will only work by chance."

* tag 'trace-3.8-rc4-fix' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  ftrace: Be first to run code modification on modules
      d26d4525