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Commit 9aabf810a6 ("mm/slub: optimize alloc/free fastpath by removing
preemption on/off") introduced an occasional hang for kernels built with
CONFIG_PREEMPT && !CONFIG_SMP.
The problem is the following loop the patch introduced to
slab_alloc_node and slab_free:
do {
tid = this_cpu_read(s->cpu_slab->tid);
c = raw_cpu_ptr(s->cpu_slab);
} while (IS_ENABLED(CONFIG_PREEMPT) && unlikely(tid != c->tid));
GCC 4.9 has been observed to hoist the load of c and c->tid above the
loop for !SMP kernels (as in this case raw_cpu_ptr(x) is compile-time
constant and does not force a reload). On arm64 the generated assembly
looks like:
ldr x4, [x0,#8]
loop:
ldr x1, [x0,#8]
cmp x1, x4
b.ne loop
If the thread is preempted between the load of c->tid (into x1) and tid
(into x4), and an allocation or free occurs in another thread (bumping
the cpu_slab's tid), the thread will be stuck in the loop until
s->cpu_slab->tid wraps, which may be forever in the absence of
allocations/frees on the same CPU.
This patch changes the loop condition to access c->tid with READ_ONCE.
This ensures that the value is reloaded even when the compiler would
otherwise assume it could cache the value, and also ensures that the
load will not be torn.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Steve Capper <steve.capper@linaro.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Commit c6a95dbee7 ("MAINTAINERS: add the RTC driver for the
Armada38x") typoed the pattern, fix it.
Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
walk_page_test() is purely pagewalk's internal stuff, and its positive
return values are not intended to be passed to the callers of pagewalk.
However, in the current code if the last vma in the do-while loop in
walk_page_range() happens to return a positive value, it leaks outside
walk_page_range(). So the user visible effect is invalid/unexpected
return value (according to the reporter, mbind() causes it.)
This patch fixes it simply by reinitializing the return value after
checked.
Another exposed interface, walk_page_vma(), already returns 0 for such
cases so no problem.
Fixes: fafaa4264e ("pagewalk: improve vma handling")
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Kazutomo Yoshii <kazutomo.yoshii@gmail.com>
Reported-by: Kazutomo Yoshii <kazutomo.yoshii@gmail.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
I have constantly stumbled upon "kernel BUG at mm/rmap.c:399!" after
upgrading to 3.19 and had no luck with 4.0-rc1 neither.
So, after looking into new logic introduced by commit 7a3ef208e6 ("mm:
prevent endless growth of anon_vma hierarchy"), I found chances are that
unlink_anon_vmas() is called without incrementing dst->anon_vma->degree
in anon_vma_clone() due to allocation failure. If dst->anon_vma is not
NULL in error path, its degree will be incorrectly decremented in
unlink_anon_vmas() and eventually underflow when exiting as a result of
another call to unlink_anon_vmas(). That's how "kernel BUG at
mm/rmap.c:399!" is triggered for me.
This patch fixes the underflow by dropping dst->anon_vma when allocation
fails. It's safe to do so regardless of original value of dst->anon_vma
because dst->anon_vma doesn't have valid meaning if anon_vma_clone()
fails. Besides, callers don't care dst->anon_vma in such case neither.
Also suggested by Michal Hocko, we can clean up vma_adjust() a bit as
anon_vma_clone() now does the work.
[akpm@linux-foundation.org: tweak comment]
Fixes: 7a3ef208e6 ("mm: prevent endless growth of anon_vma hierarchy")
Signed-off-by: Leon Yu <chianglungyu@gmail.com>
Signed-off-by: Konstantin Khlebnikov <koct9i@gmail.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: David Rientjes <rientjes@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
The Moorestown RTC driver implements suspend and resume callbacks and
assigns them to the suspend and resume fields of the device_driver
struct. These callbacks are never actually called by anything though.
Modify the driver to properly use dev_pm_ops so that the suspend and
resume functions are actually executed upon suspend/resume.
[akpm@linux-foundation.org: device_driver.name is const char *]
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Feng Tang <feng.tang@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
The coraid.com email address is defunct. The old aoe support area hosted
at coraid.com is no longer up. These changes update the email and website
to current ones.
Signed-off-by: Ed Cashin <ed.cashin@acm.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Pull block layer fixes from Jens Axboe:
"A small collection of fixes that has been gathered over the last few
weeks. This contains:
- A one-liner fix for NVMe, fixing a missing list_head init that
could makes us oops on hitting recovery at load time.
- Two small blk-mq fixes:
- Fixup a bad goto jump on error handling.
- Fix for oopsing if running out of reserved tags.
- A memory leak fix for NBD.
- Two small writeback fixes from Tejun, fixing a missing init to
INITIAL_JIFFIES, and a possible underflow introduced recently.
- A core merge fixup in sg gap detection, where rq->biotail was
indexed with the count of rq->bio"
* 'for-linus' of git://git.kernel.dk/linux-block:
writeback: fix possible underflow in write bandwidth calculation
NVMe: Initialize device list head before starting
Fix bug in blk_rq_merge_ok
blkmq: Fix NULL pointer deref when all reserved tags in
blk-mq: fix use of incorrect goto label in blk_mq_init_queue error path
nbd: fix possible memory leak
writeback: add missing INITIAL_JIFFIES init in global_update_bandwidth()
Return a negative error value like the rest of the entries in this function.
Cc: <stable@vger.kernel.org>
Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
[PM: tweaked subject line]
Signed-off-by: Paul Moore <pmoore@redhat.com>
After a suspend/resume cycle we missed to enable smt again, which leads
to all sorts of bugs, since the kernel assumes smt is enabled, while the
hardware thinks it is not.
Reported-and-tested-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Reported-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
- switch_mm() fix where init_mm.pgd ends up in the user TTBR0;
swapper_pg_dir is not suitable for user mappings
- this_cpu accessors fix for preemption safety
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Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Pull two arm64 fixes from Catalin Marinas:
- switch_mm() fix where init_mm.pgd ends up in the user TTBR0;
swapper_pg_dir is not suitable for user mappings
- this_cpu accessors fix for preemption safety
* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
arm64: percpu: Make this_cpu accessors pre-empt safe
arm64: Use the reserved TTBR0 if context switching to the init_mm
- Fix the MCE code to use CONFIG_KVM_BOOK3S_64_HANDLER
- Little endian fixes for post mobility device tree update
- Add PVR for POWER8NVL processor
- Fixes for hypervisor doorbell handling
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Merge tag 'powerpc-4.0-3' of git://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux
Pull powerpc fixes from Michael Ellerman:
- Fix the MCE code to use CONFIG_KVM_BOOK3S_64_HANDLER
- Little endian fixes for post mobility device tree update
- Add PVR for POWER8NVL processor
- Fixes for hypervisor doorbell handling
* tag 'powerpc-4.0-3' of git://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux:
powerpc/book3s: Fix the MCE code to use CONFIG_KVM_BOOK3S_64_HANDLER
powerpc/pseries: Little endian fixes for post mobility device tree update
powerpc: Add PVR for POWER8NVL processor
powerpc/powernv: Fixes for hypervisor doorbell handling
Pull libata fix from Tejun Heo:
"One patch to fix a regression from the recent switch to blk-mq tag
allocation which can cause oops on SAS-attached SATA drives"
* 'for-4.0-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata:
ata: Add a new flag to destinguish sas controller
- Use DMA'able addresses for DMA; rtsx_usb
- Use return value in the correct way; kempld-core
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Merge tag 'mfd-fixes-4.0' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd
Pull MFD fixes from Lee Jones:
- Use DMA'able addresses for DMA; rtsx_usb
- Use return value in the correct way; kempld-core
* tag 'mfd-fixes-4.0' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd:
mfd: kempld-core: Fix callback return value check
mfd: rtsx_usb: Prevent DMA from stack
Tvrtko noticed a new warning on boot:
WARNING: CPU: 1 PID: 353 at include/linux/kref.h:47 drm_framebuffer_reference+0x6c/0x80 [drm]()
Call Trace:
[<ffffffff8161f10c>] dump_stack+0x4f/0x7b
[<ffffffff81052caa>] warn_slowpath_common+0xaa/0xd0
[<ffffffff81052d8a>] warn_slowpath_null+0x1a/0x20
[<ffffffffa00d035c>] drm_framebuffer_reference+0x6c/0x80 [drm]
[<ffffffffa01c0df7>] update_state_fb.isra.54+0x47/0x50 [i915]
[<ffffffffa01ccd5c>] skylake_get_initial_plane_config+0x93c/0x950 [i915]
[<ffffffffa01e8721>] intel_modeset_init+0x1551/0x17c0 [i915]
[<ffffffffa02476e0>] i915_driver_load+0xed0/0x11e0 [i915]
[<ffffffff81627aa1>] ? _raw_spin_unlock_irqrestore+0x51/0x70
[<ffffffffa00ca8b7>] drm_dev_register+0x77/0x110 [drm]
[<ffffffffa00cda3b>] drm_get_pci_dev+0x11b/0x1f0 [drm]
[<ffffffff81098e3d>] ? trace_hardirqs_on+0xd/0x10
[<ffffffff81627aa1>] ? _raw_spin_unlock_irqrestore+0x51/0x70
[<ffffffffa0145276>] i915_pci_probe+0x56/0x60 [i915]
[<ffffffff813ad59c>] pci_device_probe+0x7c/0x100
[<ffffffff81466aad>] driver_probe_device+0x16d/0x380
We cannot take a reference at this point, not before
intel_framebuffer_init() and the underlying drm_framebuffer_init().
Introduced in:
commit 706dc7b549175e47f23e913b7f1e52874a7d0f56
Author: Matt Roper <matthew.d.roper@intel.com>
Date: Tue Feb 3 13:10:04 2015 -0800
drm/i915: Ensure plane->state->fb stays in sync with plane->fb
v2: Don't move update_state_fb(). It was moved around because I
originally put update_state_fb() in intel_alloc_plane_obj() before
finding a better place. (Matt)
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Reported-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
From drm-next:
(cherry picked from commit f55548b5af)
Signed-off-by: Dave Airlie <airlied@redhat.com>
A couple of driver specific fixes of the usual "important if you have
that device" kind together with a fix for a use after free bug that was
introduced into the trace code in some of the recent refactoring of the
message queue handling.
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Merge tag 'spi-v4.0-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi
Pull spi fixes from Mark Brown:
"A couple of driver specific fixes of the usual "important if you have
that device" kind together with a fix for a use after free bug that
was introduced into the trace code in some of the recent refactoring
of the message queue handling"
* tag 'spi-v4.0-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi:
spi: trigger trace event for message-done before mesg->complete
spi: dw-mid: clear BUSY flag fist and test other one
spi: qup: Fix cs-num DT property parsing
Two fixes here, one typo fix in the documentation and one fix for a
system hang with one of the Palmas chips caused by the use of an
incorrect offset being provided for one of the registers.
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Merge tag 'regulator-fix-v4.0-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator
Pull regulator fixes from Mark Brown:
"Two fixes here, one typo fix in the documentation and one fix for a
system hang with one of the Palmas chips caused by the use of an
incorrect offset being provided for one of the registers"
* tag 'regulator-fix-v4.0-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator:
regulator: Fix documentation for regmap in the config
regulator: palmas: Correct TPS659038 register definition for REGEN2
This patch fixes a bad interaction between the support that was added
for having regmaps without devices for early system controller
initialization and the trace support. There's a very good analysis of
the actual issue in the commit message for the change.
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Merge tag 'regmap-fix-v4.0-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap
Pull regmap fix from Mark Brown:
"This patch fixes a bad interaction between the support that was added
for having regmaps without devices for early system controller
initialization and the trace support.
There's a very good analysis of the actual issue in the commit message
for the change"
* tag 'regmap-fix-v4.0-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap:
regmap: introduce regmap_name to fix syscon regmap trace events
Without proper regulator support for individual boards, it is dangerous
to have overclocked/overvoltaged OPPs in the list. Cpufreq will increase
the frequency without the accompanying voltage increase, resulting in
an unstable system.
Remove them for now. We can revisit them with the new version of OPP
bindings, which support boost settings and frequency ranges, among
other things.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
The Olimex A10-Lime is known to be unstable when running at 1008MHz.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
We currently have a race: if we're preempted during syscall
exit, we can fail to process syscall return work that is queued
up while we're preempted in ret_from_sys_call after checking
ti.flags.
Fix it by disabling interrupts before checking ti.flags.
Reported-by: Stefan Seyfried <stefan.seyfried@googlemail.com>
Reported-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Acked-by: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Tejun Heo <tj@kernel.org>
Fixes: 96b6352c12 ("x86_64, entry: Remove the syscall exit audit")
Link: http://lkml.kernel.org/r/189320d42b4d671df78c10555976bb10af1ffc75.1427137498.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
this_cpu operations were implemented for arm64 in:
5284e1b arm64: xchg: Implement cmpxchg_double
f97fc81 arm64: percpu: Implement this_cpu operations
Unfortunately, it is possible for pre-emption to take place between
address generation and data access. This can lead to cases where data
is being manipulated by this_cpu for a different CPU than it was
called on. Which effectively breaks the spec.
This patch disables pre-emption for the this_cpu operations
guaranteeing that address generation and data manipulation take place
without a pre-emption in-between.
Fixes: 5284e1b4bc ("arm64: xchg: Implement cmpxchg_double")
Fixes: f97fc81079 ("arm64: percpu: Implement this_cpu operations")
Reported-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Steve Capper <steve.capper@linaro.org>
[catalin.marinas@arm.com: remove space after type cast]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
User visible:
- Improve support of compressed kernel modules (Jiri Olsa)
- Add --kallsyms option to 'perf diff' (David Ahern)
- Add pid/tid filtering to 'report' and 'script' commands (David Ahern)
- Add support for __print_array() in libtraceevent (Javi Merino)
- Save DSO loading errno to better report errors (Arnaldo Carvalho de Melo)
- Fix 'probe' to get ummapped symbol address on kernel (Masami Hiramatsu)
- Print big numbers using thousands' group in 'kmem' (Namhyung Kim)
- Remove (null) value of "Sort order" for perf mem report (Yunlong Song)
Infrastructure:
- Handle NULL comm name in libtracevent (Josef Bacik)
- Libtraceevent synchronization with trace-cmd repo (Steven Rostedt)
- Work around lack of sched_getcpu in glibc < 2.6. (Vinson Lee)
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Merge tag 'perf-core-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core
Pull perf/core improvements and fixes from Arnaldo Carvalho de Melo:
User visible changes:
- Improve support of compressed kernel modules (Jiri Olsa)
- Add --kallsyms option to 'perf diff' (David Ahern)
- Add pid/tid filtering to 'report' and 'script' commands (David Ahern)
- Add support for __print_array() in libtraceevent (Javi Merino)
- Save DSO loading errno to better report errors (Arnaldo Carvalho de Melo)
- Fix 'probe' to get ummapped symbol address on kernel (Masami Hiramatsu)
- Print big numbers using thousands' group in 'kmem' (Namhyung Kim)
- Remove (null) value of "Sort order" for perf mem report (Yunlong Song)
Infrastructure changes:
- Handle NULL comm name in libtracevent (Josef Bacik)
- Libtraceevent synchronization with trace-cmd repo (Steven Rostedt)
- Work around lack of sched_getcpu() in glibc < 2.6. (Vinson Lee)
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
The 'record' and 'top' tools already allow a user to specify a CSV of
pids and/or tids of tasks to collect data.
Add those options to the 'report' and 'script' analysis commands to only
consider samples related to the given pids/tids.
This is also inline with the existing comm option.
Signed-off-by: David Ahern <dsahern@gmail.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1427212361-7066-1-git-send-email-dsahern@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Since 6ea22486ba ("tracing: Add array printing helper") trace can
generate traces with variable element size arrays. Add support to
parse them.
Signed-off-by: Javi Merino <javi.merino@arm.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/1427195239-15730-1-git-send-email-javi.merino@arm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
valgrind showed that the filter token wasn't being freed properly in
process_filter().
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/20150324135923.817723903@goodmis.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
For debugging purposes, it may be helpful for the kbuffer library to flag
when crossing a sub buffer.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/20150324135923.650983637@goodmis.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
When a event PADDING is hit (a deleted event that is still in the ring
buffer), translate_data() sets the length of the padding and also updates
the data pointer which is passed back to the caller.
This is unneeded because the caller also updates the data pointer with
the passed back length. translate_data() should not update the pointer,
only set the length.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: stable@vger.kernel.org # 3.12+
Link: http://lkml.kernel.org/r/20150324135923.461431960@goodmis.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
When a plugin option is defined, by default it is a boolean (true or false).
If the option is something else, then it needs to set its "value" field to
a default string other than NULL (can be just "").
If the value is not set then the option is considered boolean, and the
updating of the option value will be handled accordingly.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/20150324135923.308372986@goodmis.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
There is a pevent_data_comm_from_pid() that returns the cmdline stored for
a given pid in order for users to map pids to comms, but there's no method
to convert a comm back to a pid. This is useful for filters that specify
a comm instead of a PID (it's faster than searching each individual event).
Add a way to retrieve a comm from a pid. Since there can be more than one
pid associated to a comm, it returns a data structure that lets the user
iterate over all the saved comms for a given pid.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/20150324135923.001103479@goodmis.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
The %z printf specifier was not handled making trace_printk()s in the
kernel that used this break on output.
Reported-by: Shawn Bohrer <shawn.bohrer@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Shawn Bohrer <shawn.bohrer@gmail.com>
Link: http://lkml.kernel.org/r/20150324135922.844361717@goodmis.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
The pevent->trace_clock should not be a direct pointer to what was
given. It should be copied and freed.
Note, valgrind pointed this out when a caller passed in a pointer that
needed to be freed and it never was. Ideally, pevent should copy it
(which this change does), and free the copy. It's up to the caller to
free the clock string passed in.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/20150324135922.695906738@goodmis.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
It is possible that a pid has no associated comm attached to it, although it
can still be passed to pevent_register_comm().
But if comm is NULL, it will cause strdup() to segfault. To prevent this
from happening, if comm is NULL use the default "<...>" name for the
pid.
Signed-off-by: Josef Bacik <jbacik@fb.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/20150324135922.549965495@goodmis.org
Link: http://lkml.kernel.org/p/1403799732-30308-1-git-send-email-jbacik@fb.com
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Before, when some problem happened while trying to load the kernel
symtab, 'perf top' would show:
┌─Warning:───────────────────────────┐
│The vmlinux file can't be used. │
│Kernel samples will not be resolved.│
│ │
│ │
│Press any key... │
└────────────────────────────────────┘
Now, it reports:
# perf top --vmlinux /dev/null
┌─Warning:───────────────────────────────────────────┐
│The /tmp/passwd file can't be used: Invalid ELF file│
│Kernel samples will not be resolved. │
│ │
│ │
│Press any key... │
└────────────────────────────────────────────────────┘
This is possible because we now register the reason for not being able
to load the symtab in the dso->load_errno member, and provide a
dso__strerror_load() routine to format this error into a strerror like
string with a short reason for the error while loading.
That can be just forwarding the dso__strerror_load() call to
strerror_r(), or, for a separate errno range providing a custom message.
Reported-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-u5rb5uq63xqhkfb8uv2lxd5u@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
To deal with forwarding the strerror_r (GNU) return we need to check if
the returned value is the buffer we passed or maybe some constant
(unknown error), simplify that action by using scnprintf, that will do
all the buflen size checks, trimming if needed.
Acked-by: Jiri Olsa <jolsa@redhat.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-d0ik6i5gjew56j0qphql28ou@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This patch fixes this build error with glibc < 2.6.
CC util/cloexec.o
cc1: warnings being treated as errors
util/cloexec.c: In function ‘perf_flag_probe’:
util/cloexec.c:24: error: implicit declaration of function
‘sched_getcpu’
util/cloexec.c:24: error: nested extern declaration of ‘sched_getcpu’
make: *** [util/cloexec.o] Error 1
Signed-off-by: Vinson Lee <vlee@twitter.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Yann Droneaud <ydroneaud@opteya.com>
Cc: stable@vger.kernel.org # 3.18+
Link: http://lkml.kernel.org/r/1427137761-16119-1-git-send-email-vlee@twopensource.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Like perf stat, this makes easy to read the numbers on stat like below:
# perf kmem stat
SUMMARY
=======
Total bytes requested: 9,770,900
Total bytes allocated: 9,782,712
Total bytes wasted on internal fragmentation: 11,812
Internal fragmentation: 0.120744%
Cross CPU allocations: 74/152,819
Suggested-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Joonsoo Kim <js1304@gmail.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1427092244-22764-2-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
The sequence of allocating the print_arg field, calling process_arg()
and verifying that the next event delimiter is repeated twice in
process_hex() and will also be used for process_int_array().
Factor it out to a function to avoid writing the same code again and
again.
Signed-off-by: Javi Merino <javi.merino@arm.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/1426875176-30244-2-git-send-email-javi.merino@arm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Fix to get correctly unmapped symbol address on kernel. This allows us
to probe on syscall symbols which are aliases of SyS_ functions with
using debuginfo.
Without this fix:
----
# ./perf probe -a sys_write
Failed to find debug information for address 3b0100
Probe point 'sys_write' not found.
Error: Failed to add events.
----
The address 0x3b0100 is a mapped address, and not usable
in debuginfo.
With this fix:
----
# ./perf probe -a sys_write
Added new event:
probe:sys_write (on sys_write)
You can now use it in all perf tools, such as:
perf record -e probe:sys_write -aR sleep 1
----
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/20150322114022.32639.19096.stgit@localhost.localdomain
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
When '--sort' is not set, 'perf mem report" will print a null pointer as
the output value of sort order, so fix it.
Example:
Before this patch:
$ perf mem report
# To display the perf.data header info, please use --header/--header-only options.
#
# Samples: 18 of event 'cpu/mem-loads/pp'
# Total weight : 188
# Sort order : (null)
#
...
After this patch:
$ perf mem report
# To display the perf.data header info, please use --header/--header-only options.
#
# Samples: 18 of event 'cpu/mem-loads/pp'
# Total weight : 188
# Sort order : local_weight,mem,sym,dso,symbol_daddr,dso_daddr,snoop,tlb,locked
#
...
Signed-off-by: Yunlong Song <yunlong.song@huawei.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1427082605-12881-1-git-send-email-yunlong.song@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Originally it was impossible to be dropping the last refcount in this
function since there was always one around still from the idr. But in
commit 83f45fc360
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Wed Aug 6 09:10:18 2014 +0200
drm: Don't grab an fb reference for the idr
we've switched to weak references, broke that assumption but forgot to
fix it up.
Since we still force-disable planes it's only possible to hit this
when racing multiple rmfb with fbdev restoring or similar evil things.
As long as userspace is nice it's impossible to hit the BUG_ON.
But the BUG_ON would most likely be hit from fbdev code, which usually
invovles the console_lock besides all modeset locks. So very likely
we'd never get the bug reports if this was hit in the wild, hence
better be safe than sorry and backport.
Spotted by Matt Roper while reviewing other patches.
[airlied: pull this back into 4.0 - the oops happens there]
Cc: stable@vger.kernel.org
Cc: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
KVM guest can fail to startup with following trace on host:
qemu-system-x86: page allocation failure: order:4, mode:0x40d0
Call Trace:
dump_stack+0x47/0x67
warn_alloc_failed+0xee/0x150
__alloc_pages_direct_compact+0x14a/0x150
__alloc_pages_nodemask+0x776/0xb80
alloc_kmem_pages+0x3a/0x110
kmalloc_order+0x13/0x50
kmemdup+0x1b/0x40
__kvm_set_memory_region+0x24a/0x9f0 [kvm]
kvm_set_ioapic+0x130/0x130 [kvm]
kvm_set_memory_region+0x21/0x40 [kvm]
kvm_vm_ioctl+0x43f/0x750 [kvm]
Failure happens when attempting to allocate pages for
'struct kvm_memslots', however it doesn't have to be
present in physically contiguous (kmalloc-ed) address
space, change allocation to kvm_kvzalloc() so that
it will be vmalloc-ed when its size is more then a page.
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
kvm_ioapic_update_eoi() wasn't called if directed EOI was enabled.
We need to do that for irq notifiers. (Like with edge interrupts.)
Fix it by skipping EOI broadcast only.
Bug: https://bugzilla.kernel.org/show_bug.cgi?id=82211
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Tested-by: Bandan Das <bsd@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Commit c4db59d31e ("fs: don't reassign dirty inodes to
default_backing_dev_info") exposed DM to a latent race in free_dev() vs
add_disk() in relation to management of the device's minor number.
Fix this by refactoring free_dev() to match cleanup order of the
alloc_dev() error path. Move cleanup of the gendisk, queue, and bdev
to _before_ the cleanup of the idr managed minor number.
Also, purely due to cleanup that fell out during the free_dev() audit:
- adjust dm_blk_close() to access the gendisk's private_data under
the _minor_lock spinlock.
- move __dm_destroy()'s dm_get_live_table() call out from under the
_minor_lock spinlock.
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1202449
Reported-by: Zdenek Kabelac <zkabelac@redhat.com>
Reported-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
The idle_task_exit() function may call switch_mm() with next ==
&init_mm. On arm64, init_mm.pgd cannot be used for user mappings, so
this patch simply sets the reserved TTBR0.
Cc: <stable@vger.kernel.org>
Reported-by: Jon Medhurst (Tixy) <tixy@linaro.org>
Tested-by: Jon Medhurst (Tixy) <tixy@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Pull networking fixes from David Miller:
1) Validate iov ranges before feeding them into iov_iter_init(), from
Al Viro.
2) We changed copy_from_msghdr_from_user() to zero out the msg_namelen
is a NULL pointer is given for the msg_name. Do the same in the
compat code too. From Catalin Marinas.
3) Fix partially initialized tuples in netfilter conntrack helper, from
Ian Wilson.
4) Missing continue; statement in nft_hash walker can lead to crashes,
from Herbert Xu.
5) tproxy_tg6_check looks for IP6T_INV_PROTO in ->flags instead of
->invflags, fix from Pablo Neira Ayuso.
6) Incorrect memory account of TCP FINs can result in negative socket
memory accounting values. Fix from Josh Hunt.
7) Don't allow virtual functions to enable VLAN promiscuous mode in
be2net driver, from Vasundhara Volam.
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net:
netfilter: nft_compat: set IP6T_F_PROTO flag if protocol is set
cx82310_eth: wait for firmware to become ready
net: validate the range we feed to iov_iter_init() in sys_sendto/sys_recvfrom
net: compat: Update get_compat_msghdr() to match copy_msghdr_from_user() behaviour
be2net: use PCI MMIO read instead of config read for errors
be2net: restrict MODIFY_EQ_DELAY cmd to a max of 8 EQs
be2net: Prevent VFs from enabling VLAN promiscuous mode
tcp: fix tcp fin memory accounting
ipv6: fix backtracking for throw routes
net: ethernet: pcnet32: Setup the SRAM and NOUFLO on Am79C97{3, 5}
ipv6: call ipv6_proxy_select_ident instead of ipv6_select_ident in udp6_ufo_fragment
netfilter: xt_TPROXY: fix invflags check in tproxy_tg6_check()
netfilter: restore rule tracing via nfnetlink_log
netfilter: nf_tables: allow to change chain policy without hook if it exists
netfilter: Fix potential crash in nft_hash walker
netfilter: Zero the tuple in nfnl_cthelper_parse_tuple()
