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Merge branch 'tip/perf/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace into perf/urgent

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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>
This commit is contained in:
Ingo Molnar 2012-05-24 09:06:24 +02:00
commit 9ba0541453
1 changed files with 5 additions and 0 deletions
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5
kernel/trace/ring_buffer.c
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@ -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;