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| author | Leonard Crestez <leonard.crestez@nxp.com> | 2019-07-24 15:53:24 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-08-25 10:52:51 +0200 |
| commit | 821bc0255862bc176620eff4ceece03b5be2141f (patch) | |
| tree | 0ad948622d2ffa20eefa2c1a9da4557259b4c071 /kernel | |
| parent | cef88692293d07f1fa090e3c497b849dfcc1e4f4 (diff) | |
| download | linux-stable-821bc0255862bc176620eff4ceece03b5be2141f.tar.gz linux-stable-821bc0255862bc176620eff4ceece03b5be2141f.tar.bz2 linux-stable-821bc0255862bc176620eff4ceece03b5be2141f.zip | |
perf/core: Fix creating kernel counters for PMUs that override event->cpu
[ Upstream commit 4ce54af8b33d3e21ca935fc1b89b58cbba956051 ]
Some hardware PMU drivers will override perf_event.cpu inside their
event_init callback. This causes a lockdep splat when initialized through
the kernel API:
WARNING: CPU: 0 PID: 250 at kernel/events/core.c:2917 ctx_sched_out+0x78/0x208
pc : ctx_sched_out+0x78/0x208
Call trace:
ctx_sched_out+0x78/0x208
__perf_install_in_context+0x160/0x248
remote_function+0x58/0x68
generic_exec_single+0x100/0x180
smp_call_function_single+0x174/0x1b8
perf_install_in_context+0x178/0x188
perf_event_create_kernel_counter+0x118/0x160
Fix this by calling perf_install_in_context with event->cpu, just like
perf_event_open
Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Frank Li <Frank.li@nxp.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will@kernel.org>
Link: https://lkml.kernel.org/r/c4ebe0503623066896d7046def4d6b1e06e0eb2e.1563972056.git.leonard.crestez@nxp.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/events/core.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c index 41fe80e3380f..a7014f854e67 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -8757,7 +8757,7 @@ perf_event_create_kernel_counter(struct perf_event_attr *attr, int cpu, goto err_free; } - perf_install_in_context(ctx, event, cpu); + perf_install_in_context(ctx, event, event->cpu); perf_unpin_context(ctx); mutex_unlock(&ctx->mutex); |