19 Feb, 2010
1 commit
-
Make remaining netlink policies as const.
Fixup coding style where needed.Signed-off-by: Alexey Dobriyan
Signed-off-by: David S. Miller
17 Feb, 2010
2 commits
-
This patch fixes following sparse warnings:
include/linux/kfifo.h:127:25: warning: Using plain integer as NULL pointer
kernel/kfifo.c:83:21: warning: Using plain integer as NULL pointerSigned-off-by: Anton Vorontsov
Acked-by: Stefani Seibold
Signed-off-by: Greg Kroah-Hartman -
After kfifo rework it's no longer possible to reliably know if kfifo is
usable, since after kfifo_free(), kfifo_initialized() would still return
true. The correct behaviour is needed for at least FHCI USB driver.This patch fixes the issue by resetting the kfifo to zero values (the
same approach is used in kfifo_alloc() if allocation failed).Signed-off-by: Anton Vorontsov
Acked-by: Stefani Seibold
Signed-off-by: Greg Kroah-Hartman
16 Feb, 2010
3 commits
-
…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:
hrtimer, softirq: Fix hrtimer->softirq trampoline -
…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/kprobes: Fix probe parsing
tracing: Fix circular dead lock in stack trace -
…/git/tip/linux-2.6-tip
* 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
perf top: Fix help text alignment
perf: Fix hypervisor sample reporting
perf: Make bp_len type to u64 generic across the arch
14 Feb, 2010
1 commit
-
Trying to add a probe like:
echo p:myprobe 0x10000 > /sys/kernel/debug/tracing/kprobe_events
will fail since the wrong pointer is passed to strict_strtoul
when trying to convert the address to an unsigned long.Signed-off-by: Heiko Carstens
Acked-by: Masami Hiramatsu
Cc: Frederic Weisbecker
Cc: Steven Rostedt
LKML-Reference:
Signed-off-by: Ingo Molnar
10 Feb, 2010
1 commit
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Export getboottime and monotonic_to_bootbased in order to let them
could be used by following patch.Cc: stable@kernel.org
Signed-off-by: Jason Wang
Signed-off-by: Marcelo Tosatti
05 Feb, 2010
1 commit
-
…/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: Handle futex value corruption gracefully
futex: Handle user space corruption gracefully
futex_lock_pi() key refcnt fix
softlockup: Add sched_clock_tick() to avoid kernel warning on kgdb resume
04 Feb, 2010
2 commits
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Change 'bp_len' type to __u64 to make it work across archs as
the s390 architecture watch point length can be upto 2^64.reference:
http://lkml.org/lkml/2010/1/25/212This is an ABI change that is not backward compatible with
the previous hardware breakpoint info layout integrated in this
development cycle, a rebuilt of perf tools is necessary for
versions based on 2.6.33-rc1 - 2.6.33-rc6 to work with a
kernel based on this patch.Signed-off-by: Mahesh Salgaonkar
Acked-by: Peter Zijlstra
Cc: Ananth N Mavinakayanahalli
Cc: "K. Prasad"
Cc: Maneesh Soni
Cc: Heiko Carstens
Cc: Martin
LKML-Reference:
Signed-off-by: Frederic Weisbecker -
hrtimers callbacks are always done from hardirq context, either the
jiffy tick interrupt or the hrtimer device interrupt.[ there is currently one exception that can still call a hrtimer
callback from softirq, but even in that case this will still
work correctly. ]Reported-by: Wei Yongjun
Signed-off-by: Peter Zijlstra
Cc: Yury Polyanskiy
Tested-by: Wei Yongjun
Acked-by: David S. Miller
LKML-Reference:
Signed-off-by: Thomas Gleixner
03 Feb, 2010
7 commits
-
The WARN_ON in lookup_pi_state which complains about a mismatch
between pi_state->owner->pid and the pid which we retrieved from the
user space futex is completely bogus.The code just emits the warning and then continues despite the fact
that it detected an inconsistent state of the futex. A conveniant way
for user space to spam the syslog.Replace the WARN_ON by a consistency check. If the values do not match
return -EINVAL and let user space deal with the mess it created.This also fixes the missing task_pid_vnr() when we compare the
pi_state->owner pid with the futex value.Reported-by: Jermome Marchand
Signed-off-by: Thomas Gleixner
Acked-by: Darren Hart
Acked-by: Peter Zijlstra
Cc: -
If the owner of a PI futex dies we fix up the pi_state and set
pi_state->owner to NULL. When a malicious or just sloppy programmed
user space application sets the futex value to 0 e.g. by calling
pthread_mutex_init(), then the futex can be acquired again. A new
waiter manages to enqueue itself on the pi_state w/o damage, but on
unlock the kernel dereferences pi_state->owner and oopses.Prevent this by checking pi_state->owner in the unlock path. If
pi_state->owner is not current we know that user space manipulated the
futex value. Ignore the mess and return -EINVAL.This catches the above case and also the case where a task hijacks the
futex by setting the tid value and then tries to unlock it.Reported-by: Jermome Marchand
Signed-off-by: Thomas Gleixner
Acked-by: Darren Hart
Acked-by: Peter Zijlstra
Cc: -
This fixes a futex key reference count bug in futex_lock_pi(),
where a key's reference count is incremented twice but decremented
only once, causing the backing object to not be released.If the futex is created in a temporary file in an ext3 file system,
this bug causes the file's inode to become an "undead" orphan,
which causes an oops from a BUG_ON() in ext3_put_super() when the
file system is unmounted. glibc's test suite is known to trigger this,
see .The bug is a regression from 2.6.28-git3, namely Peter Zijlstra's
38d47c1b7075bd7ec3881141bb3629da58f88dab "[PATCH] futex: rely on
get_user_pages() for shared futexes". That commit made get_futex_key()
also increment the reference count of the futex key, and updated its
callers to decrement the key's reference count before returning.
Unfortunately the normal exit path in futex_lock_pi() wasn't corrected:
the reference count is incremented by get_futex_key() and queue_lock(),
but the normal exit path only decrements once, via unqueue_me_pi().
The fix is to put_futex_key() after unqueue_me_pi(), since 2.6.31
this is easily done by 'goto out_put_key' rather than 'goto out'.Signed-off-by: Mikael Pettersson
Acked-by: Peter Zijlstra
Acked-by: Darren Hart
Signed-off-by: Thomas Gleixner
Cc: -
…s/security-testing-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6:
kernel/cred.c: use kmem_cache_free -
In cgroup_create(), if alloc_css_id() returns failure, the errno is not
propagated to userspace, so mkdir will fail silently.To trigger this bug, we mount blkio (or memory subsystem), and create more
then 65534 cgroups. (The number of cgroups is limited to 65535 if a
subsystem has use_id == 1)# mount -t cgroup -o blkio xxx /mnt
# for ((i = 0; i < 65534; i++)); do mkdir /mnt/$i; done
# mkdir /mnt/65534
(should return ENOSPC)
#Signed-off-by: Li Zefan
Acked-by: Serge Hallyn
Acked-by: Paul Menage
Acked-by: KAMEZAWA Hiroyuki
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Fix kfifo kernel-doc warnings:
Warning(kernel/kfifo.c:361): No description found for parameter 'total'
Warning(kernel/kfifo.c:402): bad line: @ @lenout: pointer to output variable with copied data
Warning(kernel/kfifo.c:412): No description found for parameter 'lenout'Signed-off-by: Randy Dunlap
Cc: Stefani Seibold
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Free memory allocated using kmem_cache_zalloc using kmem_cache_free rather
than kfree.The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)//
@@
expression x,E,c;
@@x = \(kmem_cache_alloc\|kmem_cache_zalloc\|kmem_cache_alloc_node\)(c,...)
... when != x = E
when != &x
?-kfree(x)
+kmem_cache_free(c,x)
//Signed-off-by: Julia Lawall
Acked-by: David Howells
Cc: James Morris
Cc: Steve Dickson
Cc:
Signed-off-by: Andrew Morton
Signed-off-by: James Morris
02 Feb, 2010
5 commits
-
When we cat /tracing/stack_trace, we may cause circular lock:
sys_read()
t_start()
arch_spin_lock(&max_stack_lock);t_show()
seq_printf(), vsnprintf() .... /* they are all trace-able,
when they are traced, max_stack_lock may be required again. */The following script can trigger this circular dead lock very easy:
#!/bin/bashecho 1 > /proc/sys/kernel/stack_tracer_enabled
mount -t debugfs xxx /mnt > /dev/null 2>&1
(
# make check_stack() zealous to require max_stack_lock
for ((; ;))
{
echo 1 > /mnt/tracing/stack_max_size
}
) &for ((; ;))
{
cat /mnt/tracing/stack_trace > /dev/null
}To fix this bug, we increase the percpu trace_active before
require the lock.Reported-by: Li Zefan
Signed-off-by: Lai Jiangshan
LKML-Reference:
Signed-off-by: Steven Rostedt -
…/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:
lockdep: Fix check_usage_backwards() error message -
…/git/tip/linux-2.6-tip
* 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
perf, hw_breakpoint, kgdb: Do not take mutex for kernel debugger
x86, hw_breakpoints, kgdb: Fix kgdb to use hw_breakpoint API
hw_breakpoints: Release the bp slot if arch_validate_hwbkpt_settings() fails.
perf: Ignore perf.data.old
perf report: Fix segmentation fault when running with '-g none' -
…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: Correct printk whitespace in warning from cpu down task check
sched: Fix incorrect sanity check
sched: Fix fork vs hotplug vs cpuset namespaces -
…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:
clocksource: Prevent potential kgdb dead lock
01 Feb, 2010
1 commit
-
When CONFIG_HAVE_UNSTABLE_SCHED_CLOCK is set, sched_clock() gets
the time from hardware such as the TSC on x86. In this
configuration kgdb will report a softlock warning message on
resuming or detaching from a debug session.Sequence of events in the problem case:
1) "cpu sched clock" and "hardware time" are at 100 sec prior
to a call to kgdb_handle_exception()2) Debugger waits in kgdb_handle_exception() for 80 sec and on
exit the following is called ... touch_softlockup_watchdog() -->
__raw_get_cpu_var(touch_timestamp) = 0;3) "cpu sched clock" = 100s (it was not updated, because the
interrupt was disabled in kgdb) but the "hardware time" = 180 sec4) The first timer interrupt after resuming from
kgdb_handle_exception updates the watchdog from the "cpu sched clock"update_process_times() { ... run_local_timers() -->
softlockup_tick() --> check (touch_timestamp == 0) (it is "YES"
here, we have set "touch_timestamp = 0" at kgdb) -->
__touch_softlockup_watchdog() ***(A)--> reset "touch_timestamp"
to "get_timestamp()" (Here, the "touch_timestamp" will still be
set to 100s.) ...scheduler_tick() ***(B)--> sched_clock_tick() (update "cpu sched
clock" to "hardware time" = 180s) ... }5) The Second timer interrupt handler appears to have a large
jump and trips the softlockup warning.update_process_times() { ... run_local_timers() -->
softlockup_tick() --> "cpu sched clock" - "touch_timestamp" =
180s-100s > 60s --> printk "soft lockup error messages" ... }note: ***(A) reset "touch_timestamp" to
"get_timestamp(this_cpu)"Why is "touch_timestamp" 100 sec, instead of 180 sec?
When CONFIG_HAVE_UNSTABLE_SCHED_CLOCK is set, the call trace of
get_timestamp() is:get_timestamp(this_cpu)
-->cpu_clock(this_cpu)
-->sched_clock_cpu(this_cpu)
-->__update_sched_clock(sched_clock_data, now)The __update_sched_clock() function uses the GTOD tick value to
create a window to normalize the "now" values. So if "now"
value is too big for sched_clock_data, it will be ignored.The fix is to invoke sched_clock_tick() to update "cpu sched
clock" in order to recover from this state. This is done by
introducing the function touch_softlockup_watchdog_sync(). This
allows kgdb to request that the sched clock is updated when the
watchdog thread runs the first time after a resume from kgdb.[yong.zhang0@gmail.com: Use per cpu instead of an array]
Signed-off-by: Jason Wessel
Signed-off-by: Dongdong Deng
Cc: kgdb-bugreport@lists.sourceforge.net
Cc: peterz@infradead.org
LKML-Reference:
Signed-off-by: Ingo Molnar
30 Jan, 2010
2 commits
-
This patch fixes the regression in functionality where the
kernel debugger and the perf API do not nicely share hw
breakpoint reservations.The kernel debugger cannot use any mutex_lock() calls because it
can start the kernel running from an invalid context.A mutex free version of the reservation API needed to get
created for the kernel debugger to safely update hw breakpoint
reservations.The possibility for a breakpoint reservation to be concurrently
processed at the time that kgdb interrupts the system is
improbable. Should this corner case occur the end user is
warned, and the kernel debugger will prohibit updating the
hardware breakpoint reservations.Any time the kernel debugger reserves a hardware breakpoint it
will be a system wide reservation.Signed-off-by: Jason Wessel
Acked-by: Frederic Weisbecker
Cc: kgdb-bugreport@lists.sourceforge.net
Cc: K.Prasad
Cc: Peter Zijlstra
Cc: Alan Stern
Cc: torvalds@linux-foundation.org
LKML-Reference:
Signed-off-by: Ingo Molnar -
In the 2.6.33 kernel, the hw_breakpoint API is now used for the
performance event counters. The hw_breakpoint_handler() now
consumes the hw breakpoints that were previously set by kgdb
arch specific code. In order for kgdb to work in conjunction
with this core API change, kgdb must use some of the low level
functions of the hw_breakpoint API to install, uninstall, and
deal with hw breakpoint reservations.The kgdb core required a change to call kgdb_disable_hw_debug
anytime a slave cpu enters kgdb_wait() in order to keep all the
hw breakpoints in sync as well as to prevent hitting a hw
breakpoint while kgdb is active.During the architecture specific initialization of kgdb, it will
pre-allocate 4 disabled (struct perf event **) structures. Kgdb
will use these to manage the capabilities for the 4 hw
breakpoint registers, per cpu. Right now the hw_breakpoint API
does not have a way to ask how many breakpoints are available,
on each CPU so it is possible that the install of a breakpoint
might fail when kgdb restores the system to the run state. The
intent of this patch is to first get the basic functionality of
hw breakpoints working and leave it to the person debugging the
kernel to understand what hw breakpoints are in use and what
restrictions have been imposed as a result. Breakpoint
constraints will be dealt with in a future patch.While atomic, the x86 specific kgdb code will call
arch_uninstall_hw_breakpoint() and arch_install_hw_breakpoint()
to manage the cpu specific hw breakpoints.The net result of these changes allow kgdb to use the same pool
of hw_breakpoints that are used by the perf event API, but
neither knows about future reservations for the available hw
breakpoint slots.Signed-off-by: Jason Wessel
Acked-by: Frederic Weisbecker
Cc: kgdb-bugreport@lists.sourceforge.net
Cc: K.Prasad
Cc: Peter Zijlstra
Cc: Alan Stern
Cc: torvalds@linux-foundation.org
LKML-Reference:
Signed-off-by: Ingo Molnar
28 Jan, 2010
3 commits
-
On a given architecture, when hardware breakpoint registration fails
due to un-supported access type (read/write/execute), we lose the bp
slot since register_perf_hw_breakpoint() does not release the bp slot
on failure.
Hence, any subsequent hardware breakpoint registration starts failing
with 'no space left on device' error.This patch introduces error handling in register_perf_hw_breakpoint()
function and releases bp slot on error.Signed-off-by: Mahesh Salgaonkar
Cc: Ananth N Mavinakayanahalli
Cc: K. Prasad
Cc: Maneesh Soni
LKML-Reference:
Signed-off-by: Frederic Weisbecker -
Due to an incorrect line break the output currently contains tabs.
Also remove trailing space.The actual output that logcheck sent me looked like this:
Task events/1 (pid = 10) is on cpu 1^I^I^I^I(state = 1, flags = 84208040)After this patch it becomes:
Task events/1 (pid = 10) is on cpu 1 (state = 1, flags = 84208040)Signed-off-by: Frans Pop
Signed-off-by: Peter Zijlstra
LKML-Reference:
Signed-off-by: Ingo Molnar -
We moved to migrate on wakeup, which means that sleeping tasks could
still be present on offline cpus. Amend the check to only test running
tasks.Reported-by: Heiko Carstens
Signed-off-by: Peter Zijlstra
Signed-off-by: Ingo Molnar
27 Jan, 2010
4 commits
-
Lockdep has found the real bug, but the output doesn't look right to me:
> =========================================================
> [ INFO: possible irq lock inversion dependency detected ]
> 2.6.33-rc5 #77
> ---------------------------------------------------------
> emacs/1609 just changed the state of lock:
> (&(&tty->ctrl_lock)->rlock){+.....}, at: [] tty_fasync+0xe8/0x190
> but this lock took another, HARDIRQ-unsafe lock in the past:
> (&(&sighand->siglock)->rlock){-.....}"HARDIRQ-unsafe" and "this lock took another" looks wrong, afaics.
> ... key at: [] __key.46539+0x0/0x8
> ... acquired at:
> [] __lock_acquire+0x1056/0x15a0
> [] lock_acquire+0x9f/0x120
> [] _raw_spin_lock_irqsave+0x52/0x90
> [] __proc_set_tty+0x3e/0x150
> [] tty_open+0x51d/0x5e0The stack-trace shows that this lock (ctrl_lock) was taken under
->siglock (which is hopefully irq-safe).This is a clear typo in check_usage_backwards() where we tell the print a
fancy routine we're forwards.Signed-off-by: Oleg Nesterov
Signed-off-by: Peter Zijlstra
LKML-Reference:
Signed-off-by: Ingo Molnar -
Update the graph tracer examples to cover the new frame pointer semantics
(in terms of passing it along). Move the HAVE_FUNCTION_GRAPH_FP_TEST docs
out of the Kconfig, into the right place, and expand on the details.Signed-off-by: Mike Frysinger
LKML-Reference:
Signed-off-by: Steven Rostedt -
If the iterator comes to an empty page for some reason, or if
the page is emptied by a consuming read. The iterator code currently
does not check if the iterator is pass the contents, and may
return a false entry.This patch adds a check to the ring buffer iterator to test if the
current page has been completely read and sets the iterator to the
next page if necessary.Signed-off-by: Steven Rostedt
-
Usually reads of the ring buffer is performed by a single task.
There are two types of reads from the ring buffer.One is a consuming read which will consume the entry that was read
and the next read will be the entry that follows.The other is an iterator that will let the user read the contents of
the ring buffer without modifying it. When an iterator is allocated,
writes to the ring buffer are disabled to protect the iterator.The problem exists when consuming reads happen while an iterator is
allocated. Specifically, the kind of read that swaps out an entire
page (used by splice) and replaces it with a new read. If the iterator
is on the page that is swapped out, then the next read may read
from this swapped out page and return garbage.This patch adds a check when reading the iterator to make sure that
the iterator contents are still valid. If a consuming read has taken
place, the iterator is reset.Signed-off-by: Steven Rostedt
26 Jan, 2010
2 commits
-
commit 0f8e8ef7 (clocksource: Simplify clocksource watchdog resume
logic) introduced a potential kgdb dead lock. When the kernel is
stopped by kgdb inside code which holds watchdog_lock then kgdb dead
locks in clocksource_resume_watchdog().clocksource_resume_watchdog() is called from kbdg via
clocksource_touch_watchdog() to avoid that the clock source watchdog
marks TSC unstable after the kernel has been stopped.Solve this by replacing spin_lock with a spin_trylock and just return
in case the lock is held. Not resetting the watchdog might result in
TSC becoming marked unstable, but that's an acceptable penalty for
using kgdb.The timekeeping is anyway easily screwed up by kgdb when the system
uses either jiffies or a clock source which wraps in short intervals
(e.g. pm_timer wraps about every 4.6s), so we really do not have to
worry about that occasional TSC marked unstable side effect.The second caller of clocksource_resume_watchdog() is
clocksource_resume(). The trylock is safe here as well because the
system is UP at this point, interrupts are disabled and nothing else
can hold watchdog_lock().Reported-by: Jason Wessel
LKML-Reference:
Cc: kgdb-bugreport@lists.sourceforge.net
Cc: Martin Schwidefsky
Cc: John Stultz
Cc: Andrew Morton
Signed-off-by: Thomas Gleixner -
If the contents of the ftrace ring buffer gets corrupted and the trace
file is read, it could create a kernel oops (usualy just killing the user
task thread). This is caused by the checking of the pid in the buffer.
If the pid is negative, it still references the cmdline cache array,
which could point to an invalid address.The simple fix is to test for negative PIDs.
Signed-off-by: Steven Rostedt
25 Jan, 2010
2 commits
-
…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:
clockevent: Don't remove broadcast device when cpu is dead -
* git://git.infradead.org/~dwmw2/mtd-2.6.33:
mtd: tests: fix read, speed and stress tests on NOR flash
mtd: Really add ARM pismo support
kmsg_dump: Dump on crash_kexec as well
22 Jan, 2010
2 commits
-
There are a number of issues:
1) TASK_WAKING vs cgroup_clone (cpusets)
copy_process():
sched_fork()
child->state = TASK_WAKING; /* waiting for wake_up_new_task() */
if (current->nsproxy != p->nsproxy)
ns_cgroup_clone()
cgroup_clone()
mutex_lock(inode->i_mutex)
mutex_lock(cgroup_mutex)
cgroup_attach_task()
ss->can_attach()
ss->attach() [ -> cpuset_attach() ]
cpuset_attach_task()
set_cpus_allowed_ptr();
while (child->state == TASK_WAKING)
cpu_relax();
will deadlock the system.2) cgroup_clone (cpusets) vs copy_process
So even if the above would work we still have:
copy_process():
if (current->nsproxy != p->nsproxy)
ns_cgroup_clone()
cgroup_clone()
mutex_lock(inode->i_mutex)
mutex_lock(cgroup_mutex)
cgroup_attach_task()
ss->can_attach()
ss->attach() [ -> cpuset_attach() ]
cpuset_attach_task()
set_cpus_allowed_ptr();
...p->cpus_allowed = current->cpus_allowed
over-writing the modified cpus_allowed.
3) fork() vs hotplug
if we unplug the child's cpu after the sanity check when the child
gets attached to the task_list but before wake_up_new_task() shit
will meet with fan.Solve all these issues by moving fork cpu selection into
wake_up_new_task().Reported-by: Serge E. Hallyn
Tested-by: Serge E. Hallyn
Signed-off-by: Peter Zijlstra
LKML-Reference:
Signed-off-by: Thomas Gleixner -
…/git/tip/linux-2.6-tip
* 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
perf: x86: Add support for the ANY bit
perf: Change the is_software_event() definition
perf: Honour event state for aux stream data
perf: Fix perf_event_do_pending() fallback callsite
perf kmem: Print usage help for unknown commands
perf kmem: Increase "Hit" column length
hw-breakpoints, perf: Fix broken mmiotrace due to dr6 by reference change
perf timechart: Use tid not pid for COMM change
21 Jan, 2010
1 commit
-
Anton reported that perf record kept receiving events even after calling
ioctl(PERF_EVENT_IOC_DISABLE). It turns out that FORK,COMM and MMAP
events didn't respect the disabled state and kept flowing in.Reported-by: Anton Blanchard
Signed-off-by: Peter Zijlstra
Tested-by: Anton Blanchard
LKML-Reference:
CC: stable@kernel.org
Signed-off-by: Ingo Molnar