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Jiri Olsa c8af898923 perf: Fix events installation during moving group 
commit 9fc81d8742 upstream.

We allow PMU driver to change the cpu on which the event
should be installed to. This happened in patch:

  e2d37cd213 ("perf: Allow the PMU driver to choose the CPU on which to install events")

This patch also forces all the group members to follow
the currently opened events cpu if the group happened
to be moved.

This and the change of event->cpu in perf_install_in_context()
function introduced in:

  0cda4c0231 ("perf: Introduce perf_pmu_migrate_context()")

forces group members to change their event->cpu,
if the currently-opened-event's PMU changed the cpu
and there is a group move.

Above behaviour causes problem for breakpoint events,
which uses event->cpu to touch cpu specific data for
breakpoints accounting. By changing event->cpu, some
breakpoints slots were wrongly accounted for given
cpu.

Vinces's perf fuzzer hit this issue and caused following
WARN on my setup:

   WARNING: CPU: 0 PID: 20214 at arch/x86/kernel/hw_breakpoint.c:119 arch_install_hw_breakpoint+0x142/0x150()
   Can't find any breakpoint slot
   [...]

This patch changes the group moving code to keep the event's
original cpu.

Reported-by: Vince Weaver <vince@deater.net>
Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Vince Weaver <vince@deater.net>
Cc: Yan, Zheng <zheng.z.yan@intel.com>
Link: http://lkml.kernel.org/r/1418243031-20367-3-git-send-email-jolsa@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2015-01-16 06:59:34 -08:00
..
cpu sched/preempt: Fix up missed PREEMPT_NEED_RESCHED folding 2014-01-13 17:38:55 +01:00
debug mm: per-thread vma caching 2014-10-09 12:21:29 -07:00
events perf: Fix events installation during moving group 2015-01-16 06:59:34 -08:00
gcov gcov: reuse kbasename helper 2013-11-13 12:09:34 +09:00
irq genirq: Sanitize spurious interrupt detection of threaded irqs 2014-06-30 20:12:00 -07:00
locking rtmutex: Plug slow unlock race 2014-06-30 20:11:58 -07:00
power PM / Sleep: fix recovery during resuming from hibernation 2014-11-14 09:00:10 -08:00
printk printk: rename printk_sched to printk_deferred 2014-08-07 14:52:37 -07:00
rcu rcu: Use rcu_gp_kthread_wake() to wake up grace period kthreads 2014-11-21 09:23:05 -08:00
sched sched/deadline: Avoid double-accounting in case of missed deadlines 2015-01-16 06:59:33 -08:00
time alarmtimer: Lock k_itimer during timer callback 2014-10-05 14:52:22 -07:00
trace tracing/syscalls: Ignore numbers outside NR_syscalls' range 2014-11-14 08:59:42 -08:00
.gitignore Ignore generated file kernel/x509_certificate_list 2013-12-10 18:21:34 +00:00
Kconfig.freezer
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Kconfig.hz kernel: remove CONFIG_USE_GENERIC_SMP_HELPERS 2013-11-15 09:32:22 +09:00
Kconfig.locks locking/mutex: Disable optimistic spinning on some architectures 2014-07-28 08:06:03 -07:00
Kconfig.preempt
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Makefile KEYS: Remove files generated when SYSTEM_TRUSTED_KEYRING=y 2013-12-13 15:59:11 +00:00
acct.c
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async.c
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audit.c audit: AUDIT_FEATURE_CHANGE message format missing delimiting space 2014-11-21 09:23:01 -08:00
audit.h audit: Use struct net not pid_t to remember the network namespce to reply in 2014-02-28 04:04:33 -08:00
audit_tree.c audit: keep inode pinned 2014-11-21 09:23:01 -08:00
audit_watch.c inotify: Fix reporting of cookies for inotify events 2014-02-18 11:17:17 +01:00
auditfilter.c audit: restore AUDIT_LOGINUID unset ABI 2015-01-08 10:00:50 -08:00
auditsc.c audit: remove superfluous new- prefix in AUDIT_LOGIN messages 2014-07-09 11:18:28 -07:00
backtracetest.c
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bounds.c mm: do not allocate page->ptl dynamically, if spinlock_t fits to long 2013-12-20 12:25:45 -08:00
capability.c CAPABILITIES: remove undefined caps from all processes 2014-09-17 09:19:09 -07:00
cgroup.c cgroup: fix unbalanced locking 2014-10-05 14:52:17 -07:00
cgroup_freezer.c cgroup: replace cftype->read_seq_string() with cftype->seq_show() 2013-12-05 12:28:04 -05:00
compat.c
…
configs.c
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context_tracking.c context_tracking: Wrap static key check into more intuitive function name 2013-12-02 20:43:14 +01:00
cpu.c sched: Fix hotplug vs. set_cpus_allowed_ptr() 2014-06-11 11:54:11 -07:00
cpu_pm.c
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cpuset.c mm: optimize put_mems_allowed() usage 2014-10-09 12:21:28 -07:00
crash_dump.c
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cred.c
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delayacct.c
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dma.c
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elfcore.c
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exec_domain.c
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exit.c exit: call disassociate_ctty() before exit_task_namespaces() 2014-04-26 17:19:07 -07:00
extable.c kernel/extable: fix address-checks for core_kernel and init areas 2013-11-28 09:49:41 -08:00
fork.c mm: per-thread vma caching 2014-10-09 12:21:29 -07:00
freezer.c freezer: Do not freeze tasks killed by OOM killer 2014-11-14 09:00:01 -08:00
futex.c futex: Ensure get_futex_key_refs() always implies a barrier 2014-10-30 09:38:24 -07:00
futex_compat.c
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groups.c userns: Don't allow setgroups until a gid mapping has been setablished 2015-01-08 10:00:50 -08:00
hrtimer.c hrtimer: Set expiry time before switch_hrtimer_base() 2014-06-07 10:28:12 -07:00
hung_task.c hung_task: Display every hung task warning 2014-01-25 12:13:33 +01:00
irq_work.c
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itimer.c
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jump_label.c
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kallsyms.c
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kcmp.c kcmp: fix standard comparison bug 2014-10-05 14:52:20 -07:00
kexec.c powerpc, kexec: Fix "Processor X is stuck" issue during kexec from ST mode 2014-06-07 10:28:28 -07:00
kmod.c execve: use 'struct filename *' for executable name passing 2014-02-05 12:54:53 -08:00
kprobes.c kprobes: use KSYM_NAME_LEN to size identifier buffers 2013-11-13 12:09:26 +09:00
ksysfs.c kdump: fix exported size of vmcoreinfo note 2014-01-23 16:37:03 -08:00
kthread.c kthread: fix return value of kthread_create() upon SIGKILL. 2014-06-30 20:11:53 -07:00
latencytop.c
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module-internal.h
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module.c modules, lock around setting of MODULE_STATE_UNFORMED 2014-11-14 08:59:52 -08:00
module_signing.c
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notifier.c
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nsproxy.c
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padata.c padata: Fix wrong usage of rcu_dereference() 2013-12-05 21:28:42 +08:00
panic.c panic: Make panic_timeout configurable 2013-11-26 12:12:26 +01:00
params.c params: improve standard definitions 2013-12-04 14:09:46 +10:30
pid.c exit: pidns: alloc_pid() leaks pid_namespace if child_reaper is exiting 2015-01-08 10:00:50 -08:00
pid_namespace.c pid_namespace: pidns_get() should check task_active_pid_ns() != NULL 2014-04-26 17:19:04 -07:00
posix-cpu-timers.c posix-timers: Convert abuses of BUG_ON to WARN_ON 2013-12-09 16:56:29 +01:00
posix-timers.c posix-timers: Fix stack info leak in timer_create() 2014-11-14 09:00:10 -08:00
profile.c mm: fix GFP_THISNODE callers and clarify 2014-03-10 17:26:19 -07:00
ptrace.c exec/ptrace: fix get_dumpable() incorrect tests 2013-11-13 12:09:33 +09:00
range.c
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reboot.c kexec: migrate to reboot cpu 2013-12-18 19:04:50 -08:00
relay.c
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res_counter.c
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resource.c
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seccomp.c
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signal.c kernel/signal.c: change do_signal_stop/do_sigaction to use while_each_thread() 2014-01-23 16:37:02 -08:00
smp.c kernel/smp.c:on_each_cpu_cond(): fix warning in fallback path 2014-09-17 09:19:09 -07:00
smpboot.c
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smpboot.h
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softirq.c Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-01-31 09:02:51 -08:00
stacktrace.c
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stop_machine.c stop_machine: Fix^2 race between stop_two_cpus() and stop_cpus() 2014-03-11 11:33:47 +01:00
sys.c kernel/sys.c: k_getrusage() can use while_each_thread() 2014-01-23 16:37:02 -08:00
sys_ni.c
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sysctl.c mm, pcp: allow restoring percpu_pagelist_fraction default 2014-07-09 11:18:26 -07:00
sysctl_binary.c kernel/sysctl_binary.c: use scnprintf() instead of snprintf() 2013-11-13 12:09:33 +09:00
system_certificates.S KEYS: correct alignment of system_certificate_list content in assembly file 2013-12-10 18:25:28 +00:00
system_keyring.c KEYS: correct alignment of system_certificate_list content in assembly file 2013-12-10 18:25:28 +00:00
task_work.c
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taskstats.c genetlink: only pass array to genl_register_family_with_ops() 2013-11-19 16:39:05 -05:00
test_kprobes.c
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time.c jiffies: Fix timeval conversion to jiffies 2014-10-09 12:21:27 -07:00
timeconst.bc
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timer.c timer: Prevent overflow in apply_slack 2014-06-07 10:28:09 -07:00
tracepoint.c tracepoint: Do not waste memory on mods with no tracepoints 2014-05-31 13:20:28 -07:00
tsacct.c
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uid16.c groups: Consolidate the setgroups permission checks 2015-01-08 10:00:49 -08:00
up.c kernel: provide a __smp_call_function_single stub for !CONFIG_SMP 2013-11-15 09:32:22 +09:00
user-return-notifier.c
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user.c userns: Add a knob to disable setgroups on a per user namespace basis 2015-01-08 10:00:50 -08:00
user_namespace.c userns: Allow setting gid_maps without privilege when setgroups is disabled 2015-01-08 10:00:50 -08:00
utsname.c
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utsname_sysctl.c
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watchdog.c kernel/watchdog.c: remove preemption restrictions when restarting lockup detector 2014-07-06 18:57:27 -07:00
workqueue.c workqueue: zero cpumask of wq_numa_possible_cpumask on init 2014-07-17 16:21:03 -07:00
workqueue_internal.h
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