diff options
| author | Fenghua Yu <[email protected]> | 2013-11-16 12:37:01 -0800 |
|---|---|---|
| committer | H. Peter Anvin <[email protected]> | 2013-11-16 18:00:58 -0800 |
| commit | f4cb1cc18f364d761d5614eb6293cccc6647f259 (patch) | |
| tree | af6be6a073d887171d49401ba9dddaed9a537a99 /tools/perf/util/trace-event-scripting.c | |
| parent | 1213959d4ad2f523290d0d7c94f712edef63852c (diff) | |
x86-64, copy_user: Remove zero byte check before copy user buffer.
Operation of rep movsb instruction handles zero byte copy. As pointed out by
Linus, there is no need to check zero size in kernel. Removing this redundant
check saves a few cycles in copy user functions.
Reported-by: Linus Torvalds <[email protected]>
Signed-off-by: Fenghua Yu <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: H. Peter Anvin <[email protected]>
Diffstat (limited to 'tools/perf/util/trace-event-scripting.c')
0 files changed, 0 insertions, 0 deletions