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authorYury Norov <ynorov@caviumnetworks.com>2018-06-08 03:10:41 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-06-08 03:34:39 +0300
commitca1250bbd4e0b852cafbc94d4d2610171107b252 (patch)
tree38d893c0658fb8db474ffe68934db200b412695a
parent0455c74788fd5aad4399f00e3fbbb7e87450ca58 (diff)
downloadlinux-ca1250bbd4e0b852cafbc94d4d2610171107b252.tar.xz
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>
-rw-r--r--lib/bitmap.c5
1 files changed, 1 insertions, 4 deletions
diff --git a/lib/bitmap.c b/lib/bitmap.c
index a42eff7e8c48..58f9750e49c6 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -64,12 +64,9 @@ EXPORT_SYMBOL(__bitmap_equal);
void __bitmap_complement(unsigned long *dst, const unsigned long *src, unsigned int bits)
{
- unsigned int k, lim = bits/BITS_PER_LONG;
+ unsigned int k, lim = BITS_TO_LONGS(bits);
for (k = 0; k < lim; ++k)
dst[k] = ~src[k];
-
- if (bits % BITS_PER_LONG)
- dst[k] = ~src[k];
}
EXPORT_SYMBOL(__bitmap_complement);