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author | Steven Rostedt <srostedt@redhat.com> | 2009-02-06 01:54:51 +0100 |
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committer | Steven Rostedt <srostedt@redhat.com> | 2009-02-08 02:01:18 +0100 |
commit | d8b891a2db13c8ed296158d6f8c4e335896d0cef (patch) | |
tree | fe6ce37bd30bf892d7f663f6eac73d8ebf12728f /include | |
parent | ring-buffer: add NMI protection for spinlocks (diff) | |
download | linux-d8b891a2db13c8ed296158d6f8c4e335896d0cef.tar.xz linux-d8b891a2db13c8ed296158d6f8c4e335896d0cef.zip |
ring-buffer: allow tracing_off to be used in core kernel code
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>
Diffstat (limited to 'include')
-rw-r--r-- | 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 b3b359660082..ac94c066f6e9 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); |