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| author | Ingo Molnar <mingo@kernel.org> | 2012-07-31 17:05:27 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2012-07-31 17:05:27 +0200 |
| commit | 1f815faec46e83bc96039797151846b60875bb06 (patch) | |
| tree | 41a874f8090e3f69c8a9f13e3c85dd7a371e569b /kernel/trace/ring_buffer.c | |
| parent | b44d50dcacea0d485ca2ff9140f8cc28ee22f28d (diff) | |
| parent | e2b34e311be3a57c9abcb927e37a57e38913714c (diff) | |
| download | linux-stable-1f815faec46e83bc96039797151846b60875bb06.tar.gz linux-stable-1f815faec46e83bc96039797151846b60875bb06.tar.bz2 linux-stable-1f815faec46e83bc96039797151846b60875bb06.zip | |
Merge branch 'linus' into timers/urgent
Merge in Linus's branch which already has timers/core merged.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/trace/ring_buffer.c')
| -rw-r--r-- | kernel/trace/ring_buffer.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c index f765465bffe4..49491fa7daa2 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -3239,6 +3239,10 @@ rb_get_reader_page(struct ring_buffer_per_cpu *cpu_buffer) if (cpu_buffer->commit_page == cpu_buffer->reader_page) goto out; + /* Don't bother swapping if the ring buffer is empty */ + if (rb_num_of_entries(cpu_buffer) == 0) + goto out; + /* * Reset the reader page to size zero. */ |