15 Oct, 2009
3 commits
-
For the short term, map synchronize_rcu_expedited() to
synchronize_rcu() for TREE_PREEMPT_RCU and to
synchronize_sched_expedited() for TREE_RCU.Longer term, there needs to be a real expedited grace period for
TREE_PREEMPT_RCU, but candidate patches to date are considerably
more complex and intrusive.Signed-off-by: Paul E. McKenney
Cc: laijs@cn.fujitsu.com
Cc: dipankar@in.ibm.com
Cc: mathieu.desnoyers@polymtl.ca
Cc: josh@joshtriplett.org
Cc: dvhltc@us.ibm.com
Cc: niv@us.ibm.com
Cc: peterz@infradead.org
Cc: rostedt@goodmis.org
Cc: Valdis.Kletnieks@vt.edu
Cc: dhowells@redhat.com
Cc: npiggin@suse.de
Cc: jens.axboe@oracle.com
LKML-Reference:
Signed-off-by: Ingo Molnar -
As the number of callbacks on a given CPU rises, invoke
force_quiescent_state() only every blimit number of callbacks
(defaults to 10,000), and even then only if no other CPU has
invoked force_quiescent_state() in the meantime.This should fix the performance regression reported by Nick.
Reported-by: Nick Piggin
Signed-off-by: Paul E. McKenney
Cc: laijs@cn.fujitsu.com
Cc: dipankar@in.ibm.com
Cc: mathieu.desnoyers@polymtl.ca
Cc: josh@joshtriplett.org
Cc: dvhltc@us.ibm.com
Cc: niv@us.ibm.com
Cc: peterz@infradead.org
Cc: rostedt@goodmis.org
Cc: Valdis.Kletnieks@vt.edu
Cc: dhowells@redhat.com
Cc: jens.axboe@oracle.com
LKML-Reference:
Signed-off-by: Ingo Molnar -
If userspace tries to perform a requeue_pi on a non-requeue_pi waiter,
it will find the futex_q->requeue_pi_key to be NULL and OOPS.Check for NULL in match_futex() instead of doing explicit NULL pointer
checks on all call sites. While match_futex(NULL, NULL) returning
false is a little odd, it's still correct as we expect valid key
references.Signed-off-by: Darren Hart
Cc: Peter Zijlstra
Cc: Ingo Molnar
CC: Eric Dumazet
CC: Dinakar Guniguntala
CC: John Stultz
Cc: stable@kernel.org
LKML-Reference:
Signed-off-by: Thomas Gleixner
14 Oct, 2009
1 commit
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The futex code does not handle spurious wake up in futex_wait and
futex_wait_requeue_pi.The code assumes that any wake up which was not caused by futex_wake /
requeue or by a timeout was caused by a signal wake up and returns one
of the syscall restart error codes.In case of a spurious wake up the signal delivery code which deals
with the restart error codes is not invoked and we return that error
code to user space. That causes applications which actually check the
return codes to fail. Blaise reported that on preempt-rt a python test
program run into a exception trap. -rt exposed that due to a built in
spurious wake up accelerator :)Solve this by checking signal_pending(current) in the wake up path and
handle the spurious wake up case w/o returning to user space.Reported-by: Blaise Gassend
Debugged-by: Darren Hart
Signed-off-by: Thomas Gleixner
Cc: Peter Zijlstra
Cc: stable@kernel.org
LKML-Reference:
13 Oct, 2009
1 commit
-
…file into core/urgent
10 Oct, 2009
2 commits
-
A race shouldn't happen since all workqueues or handlers are canceled
or flushed before the event buffer is freed. A warning is triggered
now if the buffer is freed too early.Also, this patch adds some comments about event buffer protection,
reworks some code and adds code to clear buffer_pos during alloc and
free of the event buffer.Cc: David Rientjes
Cc: Stephane Eranian
Signed-off-by: Robert Richter -
Looking at the 2.6.31-rc9 code, it appears there is a race condition
in the event_buffer cleanup code path (shutdown). This could lead to
kernel panic as some CPUs may be operating on the event buffer AFTER
it has been freed. The attached patch solves the problem and makes
sure CPUs check if the buffer is not NULL before they access it as
some may have been spinning on the mutex while the buffer was being
freed.The race may happen if the buffer is freed during pending reads. But
it is not clear why there are races in add_event_entry() since all
workqueues or handlers are canceled or flushed before the event buffer
is freed.Signed-off-by: David Rientjes
Signed-off-by: Stephane Eranian
Signed-off-by: Robert Richter
09 Oct, 2009
15 commits
-
Some tracepoint magic (TRACE_EVENT(lock_acquired)) relies on
the fact that lock hold times are positive and uses div64 on
that. That triggered a build warning on MIPS, and probably
causes bad output in certain circumstances as well.Make it truly positive.
Reported-by: Andrew Morton
Signed-off-by: Peter Zijlstra
LKML-Reference:
Signed-off-by: Ingo Molnar -
* 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev:
pata_atp867x: add Power Management support
pata_atp867x: PIO support fixes
pata_atp867x: clarifications in timings calculations and cable detection
pata_atp867x: fix it to not claim MWDMA support
libata: fix incorrect link online check during probe
ahci: filter FPDMA non-zero offset enable for Aspire 3810T
libata: make gtf_filter per-dev
libata: implement more acpi filtering options
libata: cosmetic updates
ahci: display all AHCI 1.3 HBA capability flags (v2)
pata_ali: trivial fix of a very frequent spelling mistake
ahci: disable 64bit DMA by default on SB600s -
…/git/tip/linux-2.6-tip
* 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
futex: fix requeue_pi key imbalance
futex: Fix typo in FUTEX_WAIT/WAKE_BITSET_PRIVATE definitions
rcu: Place root rcu_node structure in separate lockdep class
rcu: Make hot-unplugged CPU relinquish its own RCU callbacks
rcu: Move rcu_barrier() to rcutree
futex: Move exit_pi_state() call to release_mm()
futex: Nullify robust lists after cleanup
futex: Fix locking imbalance
panic: Fix panic message visibility by calling bust_spinlocks(0) before dying
rcu: Replace the rcu_barrier enum with pointer to call_rcu*() function
rcu: Clean up code based on review feedback from Josh Triplett, part 4
rcu: Clean up code based on review feedback from Josh Triplett, part 3
rcu: Fix rcu_lock_map build failure on CONFIG_PROVE_LOCKING=y
rcu: Clean up code to address Ingo's checkpatch feedback
rcu: Clean up code based on review feedback from Josh Triplett, part 2
rcu: Clean up code based on review feedback from Josh Triplett -
…l/git/tip/linux-2.6-tip
* 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
sched: Set correct normal_prio and prio values in sched_fork() -
…git/tip/linux-2.6-tip
* 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
x86, pci: Correct spelling in a comment
x86: Simplify bound checks in the MTRR code
x86: EDAC: carve out AMD MCE decoding logic
initcalls: Add early_initcall() for modules
x86: EDAC: MCE: Fix MCE decoding callback logic -
…nel/git/tip/linux-2.6-tip
* 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
tracing: user local buffer variable for trace branch tracer
tracing: fix warning on kernel/trace/trace_branch.c andtrace_hw_branches.c
ftrace: check for failure for all conversions
tracing: correct module boundaries for ftrace_release
tracing: fix transposed numbers of lock_depth and preempt_count
trace: Fix missing assignment in trace_ctxwake_*
tracing: Use free_percpu instead of kfree
tracing: Check total refcount before releasing bufs in profile_enable failure -
…/linux/kernel/git/tip/linux-2.6-tip
* 'sparc-perf-events-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
mm, perf_event: Make vmalloc_user() align base kernel virtual address to SHMLBA
perf_event: Provide vmalloc() based mmap() backing -
…el/git/tip/linux-2.6-tip
* 'perf-fixes-for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
perf_events: Make ABI definitions available to userspace
perf tools: elf_sym__is_function() should accept "zero" sized functions
tracing/syscalls: Use long for syscall ret format and field definitions
perf trace: Update eval_flag() flags array to match interrupt.h
perf trace: Remove unused code in builtin-trace.c
perf: Propagate term signal to child -
…el/git/tip/linux-2.6-tip
* 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
x86, timers: Check for pending timers after (device) interrupts
NOHZ: update idle state also when NOHZ is inactive -
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6:
ALSA: ice1724: increase SPDIF and independent stereo buffer sizes
ALSA: opl3: circular locking in the snd_opl3_note_on() and snd_opl3_note_off()
ALSA: ICE1712/24 - Change the Multi Track Peak control (level meters) from MIXER to PCM type
ALSA: hda - Fix yet another auto-mic bug in ALC268
ASoC: WM8350 capture PGA mutes are inverted
ASoC: Remove absent SYNC and TDM DAI format options from i.MX SSI
sound: via82xx: move DXS volume controls to PCM interface
ALSA: hda - Don't pick up invalid HP pins in alc_subsystem_id()
ALSA: hda - Add a workaround for ASUS A7K
ALSA: hda - Fix invalid initializations for ALC861 auto mode
ASoC: wm8940: Fix check on error code form snd_soc_codec_set_cache_io
ASoC: Fix SND_SOC_DAPM_LINE handling -
* 'drm-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6: (24 commits)
drm/radeon/kms: fix vline register for second head.
drm/r600: avoid assigning vb twice in blit code
drm/radeon: use list_for_each_entry instead of list_for_each
drm/radeon/kms: Fix AGP support for R600/RV770 family (v2)
drm/radeon/kms: Fallback to non AGP when acceleration fails to initialize (v2)
drm/radeon/kms: Fix RS600/RV515/R520/RS690 IRQ
drm/radeon: Fix setting of bits
drm/ttm: fix refcounting in ttm global code.
drm/fb: add more correct 8/16/24/32 bpp fb support.
drm/fb: add setcmap and fix 8-bit support.
drm/radeon/kms: respect single crtc cards, only create one crtc. (v2)
drm: Delete the DRM_DEBUG_KMS in drm_mode_cursor_ioctl
drm/radeon/kms: add support for "Surround View"
drm/radeon/kms: Fix irq handling on AVIVO hw
drm/radeon/kms: R600/RV770 remove dead code and print message for wrong BIOS
drm/radeon/kms: Fix R600/RV770 disable acceleration path
drm/radeon/kms: Fix R600/RV770 startup path & reset
drm/radeon/kms: Fix R600 write back buffer
drm/radeon/kms: Remove old init path as no hw use it anymore
drm/radeon/kms: Convert RS600 to new init path
... -
…/git/tmlind/linux-omap-2.6
* 'omap-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap-2.6:
omapfb: Blizzard: constify register address tables
omapfb: Blizzard: fix pointer to be const
omapfb: Condition mutex acquisition
omap: iovmm: Add missing mutex_unlock
omap: iovmm: Fix incorrect spelling
omap: SRAM: flush the right address after memcpy in omap_sram_push
omap: Lock DPLL5 at boot
omap: Fix incorrect 730 vs 850 detection
OMAP3: PM: introduce a new powerdomain walk helper
OMAP3: PM: Enable GPIO module-level wakeups
OMAP3: PM: USBHOST: clear wakeup events on both hosts
OMAP3: PM: PRCM interrupt: only handle selected PRCM interrupts
OMAP3: PM: PRCM interrupt: check MPUGRPSEL register
OMAP3: PM: Prevent hang in prcm_interrupt_handler -
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/bp/bp:
amd64_edac: beef up DRAM error injection
amd64_edac: fix DRAM base and limit extraction
amd64_edac: fix chip select handling
amd64_edac: simple fix to allow reporting of CECC errors
amd64_edac: fix K8 intlv_sel check
amd64_edac: fix interleave enable tests
amd64_edac: fix DRAM base and limit address extraction
amd64_edac: fix driver instance lookup table allocation -
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: (40 commits)
ethoc: limit the number of buffers to 128
ethoc: use system memory as buffer
ethoc: align received packet to make IP header at word boundary
ethoc: fix buffer address mapping
ethoc: fix typo to compute number of tx descriptors
au1000_eth: Duplicate test of RX_OVERLEN bit in update_rx_stats()
netxen: Fix Unlikely(x) > y
pasemi_mac: ethtool get settings fix
add maintainer for network drop monitor kernel service
tg3: Fix phylib locking strategy
rndis_host: support ETHTOOL_GPERMADDR
ipv4: arp_notify address list bug
gigaset: add kerneldoc comments
gigaset: correct debugging output selection
gigaset: improve error recovery
gigaset: fix device ERROR response handling
gigaset: announce if built with debugging
gigaset: handle isoc frame errors more gracefully
gigaset: linearize skb
gigaset: fix reject/hangup handling
... -
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/ide-2.6:
Revert "Revert "ide: try to use PIO Mode 0 during probe if possible""
sis5513: fix PIO setup for ATAPI devices
08 Oct, 2009
18 commits
-
Now that range timers and deferred timers are common, I found a
problem with these using the "perf timechart" tool. Frans Pop also
reported high scheduler latencies via LatencyTop, when using
iwlagn.It turns out that on x86, these two 'opportunistic' timers only get
checked when another "real" timer happens. These opportunistic
timers have the objective to save power by hitchhiking on other
wakeups, as to avoid CPU wakeups by themselves as much as possible.The change in this patch runs this check not only at timer
interrupts, but at all (device) interrupts. The effect is that:1) the deferred timers/range timers get delayed less
2) the range timers cause less wakeups by themselves because
the percentage of hitchhiking on existing wakeup events goes up.I've verified the working of the patch using "perf timechart", the
original exposed bug is gone with this patch. Frans also reported
success - the latencies are now down in the expected ~10 msec
range.Signed-off-by: Arjan van de Ven
Tested-by: Frans Pop
Cc: Linus Torvalds
Cc: Peter Zijlstra
Cc: Mike Galbraith
LKML-Reference:
Signed-off-by: Ingo Molnar -
When a vmalloc'd area is mmap'd into userspace, some kind of
co-ordination is necessary for this to work on platforms with cpu
D-caches which can have aliases.Otherwise kernel side writes won't be seen properly in userspace
and vice versa.If the kernel side mapping and the user side one have the same
alignment, modulo SHMLBA, this can work as long as VM_SHARED is
shared of VMA and for all current users this is true. VM_SHARED
will force SHMLBA alignment of the user side mmap on platforms with
D-cache aliasing matters.The bulk of this patch is just making it so that a specific
alignment can be passed down into __get_vm_area_node(). All
existing callers pass in '1' which preserves existing behavior.
vmalloc_user() gives SHMLBA for the alignment.As a side effect this should get the video media drivers and other
vmalloc_user() users into more working shape on such systems.Signed-off-by: David S. Miller
Acked-by: Peter Zijlstra
Cc: Jens Axboe
Cc: Nick Piggin
Signed-off-by: Andrew Morton
LKML-Reference:
Signed-off-by: Ingo Molnar -
* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/kyle/parisc-2.6:
agp: parisc-agp.c - use correct page_mask function
parisc: Fix linker script breakage.
parisc: convert to asm-generic/hardirq.h
parisc: Make THREAD_SIZE available to assembly files and linker scripts.
parisc: correct use of SHF_ALLOC
parisc: rename parisc's vmalloc_start to parisc_vmalloc_start
parisc: add me to Maintainers
parisc: includecheck fix: signal.c
parisc: HAVE_ARCH_TRACEHOOK
parisc: add skeleton syscall.h
parisc: stop using task->ptrace for {single,block}step flags
parisc: split syscall_trace into two halves
parisc: add missing TI_TASK macro in syscall.S
parisc: tracehook_signal_handler
parisc: tracehook_report_syscall -
In module unload, lis3lv02d core driver sysfs clean up was not called.
Signed-off-by: Samu Onkalo
Acked-by: Daniel Mack
Cc: Éric Piel
Cc: "Trisal, Kalhan"
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The PC Card 8.0 specification (vol. 4, section 3.2.10) says the
TPLLV1_INFO field of the CISTPL_VERS_1 tuple must contain 4 strings. Some
cards don't have all 4 so just parse as many as we can.[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: David Vrabel
Tested-by: Jonathan Cameron
Tested-by: Bing Zhao
Cc: Roel Kluin
Cc:
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
For hwpoison stress testing. The debugfs mount point is assumed to be
/debug/.Signed-off-by: Wu Fengguang
Cc: Andi Kleen
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Signed-off-by: Wu Fengguang
Cc: Andi Kleen
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Signed-off-by: Wu Fengguang
Cc: Andi Kleen
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Refactor the code to be more modular and easier to reuse.
Signed-off-by: Wu Fengguang
Cc: Andi Kleen
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This helps merge duplicate code (now and future) and outstand the main
logic.Signed-off-by: Wu Fengguang
Cc: Andi Kleen
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Signed-off-by: Wu Fengguang
Cc: Andi Kleen
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
It indicates to the system admin that processes mapping such pages may be
eating less physical memory than the reported numbers by legacy tools.Signed-off-by: Wu Fengguang
Cc: Hugh Dickins
Cc: Izik Eidus
Acked-by: Chris Wright
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This flag indicates a hardware detected memory corruption on the page.
Any future access of the page data may bring down the machine.Signed-off-by: Wu Fengguang
Cc: Andi Kleen
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Update documentation of cgroups tasks and procs files
Document the cgroup.procs file.
Clarify the semantics of the cgroup.procs and tasks files. Although the
current cgroup.procs interface returns a sorted and uniqified list of
pids, potential future performance enhancements could result in those
properties being removed - explicitly document this aspect of the API.There are no existing users of cgroup.procs, so compatibility isn't an
issue. There are users of the "tasks" file, but none that would appear to
break in the event of the sorted property being broken. The standard
"libcpuset" explicitly sorts the results of reading from the tasks file,
and "libcg" and other users don't appear to care about ordering.Signed-off-by: Paul Menage
Reviewed-by: Li Zefan
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
fix the following 'make includecheck' warning:
drivers/video/da8xx-fb.c: linux/device.h is included more than once.
Signed-off-by: Jaswinder Singh Rajput
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
fix the following 'make includecheck' warning:
drivers/video/msm/mddi.c: linux/delay.h is included more than once.
Signed-off-by: Jaswinder Singh Rajput
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
fix the following 'make includecheck' warning:
fs/proc/kcore.c: linux/mm.h is included more than once.
Signed-off-by: Jaswinder Singh Rajput
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
fix the following 'make includecheck' warning:
mm/vmalloc.c: linux/highmem.h is included more than once.
Signed-off-by: Jaswinder Singh Rajput
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
