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ring-buffer: replace sizeof of event header with offsetof 

Impact: fix to possible alignment problems on some archs.

Some arch compilers include an NULL char array in the sizeof field.
Since the ring_buffer_event type includes one of these, it is better
to use the "offsetof" instead, to avoid strange bugs on these archs.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
This commit is contained in:
Steven Rostedt 2009-03-03 13:53:07 -05:00
parent ef7a4a1614
commit e3d6bf0a07
1 changed files with 1 additions and 1 deletions
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kernel/trace/ring_buffer.c
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@ -132,7 +132,7 @@ void ring_buffer_normalize_time_stamp(int cpu, u64 *ts)
} }
EXPORT_SYMBOL_GPL(ring_buffer_normalize_time_stamp); EXPORT_SYMBOL_GPL(ring_buffer_normalize_time_stamp);
#define RB_EVNT_HDR_SIZE (sizeof(struct ring_buffer_event)) #define RB_EVNT_HDR_SIZE (offsetof(struct ring_buffer_event, array))
#define RB_ALIGNMENT 4U #define RB_ALIGNMENT 4U
#define RB_MAX_SMALL_DATA 28 #define RB_MAX_SMALL_DATA 28