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ring-buffer: disable all cpu buffers when one finds a problem

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Currently the way RB_WARN_ON works, is to disable either the current
CPU buffer or all CPU buffers, depending on whether a ring_buffer or
ring_buffer_per_cpu struct was passed into the macro.

Most users of the RB_WARN_ON pass in the CPU buffer, so only the one
CPU buffer gets disabled but the rest are still active. This may
confuse users even though a warning is sent to the console.

This patch changes the macro to disable the entire buffer even if
the CPU buffer is passed in.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt 2009-09-03 19:53:46 -04:00 • committed by Steven Rostedt
parent a1863c212b
commit 077c5407cd
1 changed files with 13 additions and 8 deletions
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9
kernel/trace/ring_buffer.c
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@ -467,11 +467,16 @@ struct ring_buffer_iter {
}; };
/* buffer may be either ring_buffer or ring_buffer_per_cpu */ /* buffer may be either ring_buffer or ring_buffer_per_cpu */
#define RB_WARN_ON(buffer, cond) \ #define RB_WARN_ON(b, cond) \
({ \ ({ \
int _____ret = unlikely(cond); \ int _____ret = unlikely(cond); \
if (_____ret) { \ if (_____ret) { \
atomic_inc(&buffer->record_disabled); \ if (__same_type(*(b), struct ring_buffer_per_cpu)) { \
struct ring_buffer_per_cpu *__b = \
(void *)b; \
atomic_inc(&__b->buffer->record_disabled); \
} else \
atomic_inc(&b->record_disabled); \
WARN_ON(1); \ WARN_ON(1); \
} \ } \
_____ret; \ _____ret; \