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authorVasiliy Kulikov <segoon@openwall.com>2011-08-03 22:28:26 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2011-08-03 14:45:55 -1000
commit298507d4d2cff2248e84afcf646b697301294442 (patch)
tree15861e6610403c57cf4eca976dea4d59ac7a8e99 /.mailmap
parent33a30ed4bdccd95ed84a1a20c1fef8ac89788ce5 (diff)
shm: optimize exit_shm()
We may optimistically check .in_use == 0 without holding the rw_mutex: it's the common case, and if it's zero, there certainly won't be any segments associated with us. After taking the lock, the idr_for_each() will do the right thing, so we could now drop the re-check inside the lock without any real cost. But it won't hurt. Signed-off-by: Vasiliy Kulikov <segoon@openwall.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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