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overlay: Fix wraparound handling of perf ringbuffer

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Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2013-08-17 18:09:40 +01:00
parent cc45a9a3db
commit 3e430a8b01
1 changed files with 2 additions and 2 deletions
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4
overlay/gpu-perf.c
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@ -226,7 +226,7 @@ int gpu_perf_update(struct gpu_perf *gp)
rmb();
if (head < tail)
tail = head; /* XXX */
head += size;
data = (uint8_t *)mmap + gp->page_size;
while (head - tail >= sizeof (struct perf_event_header)) {
@ -262,7 +262,7 @@ int gpu_perf_update(struct gpu_perf *gp)
tail += header->size;
}
mmap->data_tail = tail;
mmap->data_tail = tail & mask;
}
free(buffer);