lib/bitmap.c: micro-optimization for __bitmap_complement()
authorYury Norov <ynorov@caviumnetworks.com>
Fri, 8 Jun 2018 00:10:41 +0000 (17:10 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 8 Jun 2018 00:34:39 +0000 (17:34 -0700)
commitca1250bbd4e0b852cafbc94d4d2610171107b252
tree38d893c0658fb8db474ffe68934db200b412695a
parent0455c74788fd5aad4399f00e3fbbb7e87450ca58
lib/bitmap.c: micro-optimization for __bitmap_complement()

Use BITS_TO_LONGS() macro to avoid calculation of reminder (bits %
BITS_PER_LONG) On ARM64 it saves 5 instruction for function - 16 before
and 11 after.

Link: http://lkml.kernel.org/r/20180411145914.6011-1-ynorov@caviumnetworks.com
Signed-off-by: Yury Norov <ynorov@caviumnetworks.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Matthew Wilcox <mawilcox@microsoft.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
lib/bitmap.c