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| author |   Steven Rostedt <srostedt@redhat.com> | 2009-05-01 20:26:54 -0400 |
|---|---|---|
| committer |   Steven Rostedt <rostedt@goodmis.org> | 2009-05-05 17:22:02 -0400 |
| commit | 41ede23eded40832c955d98d4b71bc244809abb3 (patch) | |
| tree | 044d968ac2d5784a80b46ba2ea04e639ac3e501b | |
| parent | ring-buffer: have read page swap increment counter with page entries (diff) | |
| download | linux-dev-41ede23eded40832c955d98d4b71bc244809abb3.tar.xz linux-dev-41ede23eded40832c955d98d4b71bc244809abb3.zip | |
ring-buffer: disable writers when resetting buffers
As a precaution, it is best to disable writing to the ring buffers
when reseting them.
[ Impact: prevent weird things if write happens during reset ]
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
| -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 9e42a742a3f9..7876df00695f 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -2650,6 +2650,8 @@ void ring_buffer_reset_cpu(struct ring_buffer *buffer, int cpu) if (!cpumask_test_cpu(cpu, buffer->cpumask)) return; + atomic_inc(&cpu_buffer->record_disabled); + spin_lock_irqsave(&cpu_buffer->reader_lock, flags); __raw_spin_lock(&cpu_buffer->lock); @@ -2659,6 +2661,8 @@ void ring_buffer_reset_cpu(struct ring_buffer *buffer, int cpu) __raw_spin_unlock(&cpu_buffer->lock); spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags); + + atomic_dec(&cpu_buffer->record_disabled); } EXPORT_SYMBOL_GPL(ring_buffer_reset_cpu); |