diff options
| author | Ingo Molnar <mingo@kernel.org> | 2012-05-24 09:06:24 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2012-05-24 09:06:24 +0200 |
| commit | 9ba0541453b3a57797701b9fbc0fd8d0be173050 (patch) | |
| tree | 29cc15e3d9b05d78f8adb8516baf6c1a3d7626a9 | |
| parent | f9369910a6225b8d4892c3f20ae740a711cd5ace (diff) | |
| parent | 6a31e1f135d1abfb5137697f889c8cd5d72eb522 (diff) | |
Merge branch 'tip/perf/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace into perf/urgent
Pull an ftrace ring-buffer fix from Steve Rostedt:
* fix kernel crash when changing the size of the ring-buffer on
boxes where possible_cpus != online_cpus.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
| -rw-r--r-- | kernel/trace/ring_buffer.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c index 6420cda6233..1d0f6a8a0e5 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -1486,6 +1486,11 @@ int ring_buffer_resize(struct ring_buffer *buffer, unsigned long size, if (!buffer) return size; + /* Make sure the requested buffer exists */ + if (cpu_id != RING_BUFFER_ALL_CPUS && + !cpumask_test_cpu(cpu_id, buffer->cpumask)) + return size; + size = DIV_ROUND_UP(size, BUF_PAGE_SIZE); size *= BUF_PAGE_SIZE; |