Messages in this thread Patch in this message | | | Date | Sun, 08 Feb 2009 00:49:58 -0500 | From | Steven Rostedt <> | Subject | [PATCH 3/8] ring-buffer: allow tracing_off to be used in core kernel code |
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From: Steven Rostedt <srostedt@redhat.com>
tracing_off() is the fastest way to stop recording to the ring buffers. This may be used in places like panic and die, just before the ftrace_dump is called.
This patch adds the appropriate CPP conditionals to make it a stub function when the ring buffer is not configured it.
Signed-off-by: Steven Rostedt <srostedt@redhat.com> --- include/linux/ring_buffer.h | 9 +++++++++ 1 files changed, 9 insertions(+), 0 deletions(-)
diff --git a/include/linux/ring_buffer.h b/include/linux/ring_buffer.h index b3b3596..ac94c06 100644 --- a/include/linux/ring_buffer.h +++ b/include/linux/ring_buffer.h @@ -124,9 +124,18 @@ unsigned long ring_buffer_overrun_cpu(struct ring_buffer *buffer, int cpu); u64 ring_buffer_time_stamp(int cpu); void ring_buffer_normalize_time_stamp(int cpu, u64 *ts); +/* + * The below functions are fine to use outside the tracing facility. + */ +#ifdef CONFIG_RING_BUFFER void tracing_on(void); void tracing_off(void); void tracing_off_permanent(void); +#else +static inline void tracing_on(void) { } +static inline void tracing_off(void) { } +static inline void tracing_off_permanent(void) { } +#endif void *ring_buffer_alloc_read_page(struct ring_buffer *buffer); void ring_buffer_free_read_page(struct ring_buffer *buffer, void *data); -- 1.5.6.5 --
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