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authorAkinobu Mita <akinobu.mita@gmail.com>2012-03-23 15:02:14 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-03-23 16:58:35 -0700
commitf43804bf5f9ae1e60077c5f22aee5fdfe4f09837 (patch)
tree61e2dcaef0ab774d5cd68a89859f569d54fa7f78 /security
parenta403d930c58eb8448f81fa90c125ac36dc8ef89d (diff)
downloadlinux-f43804bf5f9ae1e60077c5f22aee5fdfe4f09837.tar.bz2
string: memchr_inv() speed improvements
- Generate a 64-bit pattern more efficiently memchr_inv needs to generate a 64-bit pattern filled with a target character. The operation can be done by more efficient way. - Don't call the slow check_bytes() if the memory area is 64-bit aligned memchr_inv compares contiguous 64-bit words with the 64-bit pattern as much as possible. The outside of the region is checked by check_bytes() that scans for each byte. Unfortunately, the first 64-bit word is unexpectedly scanned by check_bytes() even if the memory area is aligned to a 64-bit boundary. Both changes were originally suggested by Eric Dumazet. Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Suggested-by: Eric Dumazet <eric.dumazet@gmail.com> Cc: Brian Norris <computersforpeace@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'security')
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