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Commit d8b891a2 authored by Steven Rostedt's avatar Steven Rostedt
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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: default avatarSteven Rostedt <srostedt@redhat.com>
parent 78d904b4

include/linux/ring_buffer.h

+9 −0
Original line number Diff line number Diff line
@@ -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);