diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2010-03-13 14:40:50 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-03-13 14:40:50 -0800 |
| commit | 8655e7e3ddec60603c4f6c14cdf642e2ba198df8 (patch) | |
| tree | 711b6da2a665e26940c59b9db493c59d879f6cc6 /kernel/trace/ring_buffer.c | |
| parent | 461d208cfbd1f0af26027b2c35ded515e54b1ee6 (diff) | |
| parent | b6345879ccbd9b92864fbd7eb8ac48acdb4d6b15 (diff) | |
Merge branch 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
tracing: Do not record user stack trace from NMI context
tracing: Disable buffer switching when starting or stopping trace
tracing: Use same local variable when resetting the ring buffer
function-graph: Init curr_ret_stack with ret_stack
ring-buffer: Move disabled check into preempt disable section
function-graph: Add tracing_thresh support to function_graph tracer
tracing: Update the comm field in the right variable in update_max_tr
function-graph: Use comment notation for func names of dangling '}'
function-graph: Fix unused reference to ftrace_set_func()
tracing: Fix warning in s_next of trace file ops
tracing: Include irqflags headers from trace clock
Diffstat (limited to 'kernel/trace/ring_buffer.c')
| -rw-r--r-- | kernel/trace/ring_buffer.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c index a2f0fe95183..05a9f83b881 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -2233,12 +2233,12 @@ ring_buffer_lock_reserve(struct ring_buffer *buffer, unsigned long length) if (ring_buffer_flags != RB_BUFFERS_ON) return NULL; - if (atomic_read(&buffer->record_disabled)) - return NULL; - /* If we are tracing schedule, we don't want to recurse */ resched = ftrace_preempt_disable(); + if (atomic_read(&buffer->record_disabled)) + goto out_nocheck; + if (trace_recursive_lock()) goto out_nocheck; @@ -2470,11 +2470,11 @@ int ring_buffer_write(struct ring_buffer *buffer, if (ring_buffer_flags != RB_BUFFERS_ON) return -EBUSY; - if (atomic_read(&buffer->record_disabled)) - return -EBUSY; - resched = ftrace_preempt_disable(); + if (atomic_read(&buffer->record_disabled)) + goto out; + cpu = raw_smp_processor_id(); if (!cpumask_test_cpu(cpu, buffer->cpumask)) |