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authorMatthew Wilcox <mawilcox@microsoft.com>2017-07-11 01:51:35 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2017-07-11 02:32:34 +0300
commit2c6deb01525ac11cc03c44fe31e3f45ce2cadaf9 (patch)
tree3ec33e9980028a7d01f54772b0a7ce60db55c39c /arch/arm/boot/compressed
parent2a98dc028f911a7c59c87d11d4eed6626be1605b (diff)
downloadlinux-2c6deb01525ac11cc03c44fe31e3f45ce2cadaf9.tar.xz
bitmap: use memcmp optimisation in more situations
Commit 7dd968163f7c ("bitmap: bitmap_equal memcmp optimization") was rather more restrictive than necessary; we can use memcmp() to implement bitmap_equal() as long as the number of bits can be proved to be a multiple of 8. And architectures other than s390 may be able to make good use of this optimisation. [arnd@arndb.de: fix build: add a memcmp() declaration] Link: http://lkml.kernel.org/r/20170630153908.3439707-1-arnd@arndb.de Link: http://lkml.kernel.org/r/20170628153221.11322-5-willy@infradead.org Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/arm/boot/compressed')
-rw-r--r--arch/arm/boot/compressed/decompress.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm/boot/compressed/decompress.c b/arch/arm/boot/compressed/decompress.c
index ea7832702a8f..f3a4bedd1afc 100644
--- a/arch/arm/boot/compressed/decompress.c
+++ b/arch/arm/boot/compressed/decompress.c
@@ -33,6 +33,7 @@ extern void error(char *);
/* Not needed, but used in some headers pulled in by decompressors */
extern char * strstr(const char * s1, const char *s2);
extern size_t strlen(const char *s);
+extern int memcmp(const void *cs, const void *ct, size_t count);
#ifdef CONFIG_KERNEL_GZIP
#include "../../../../lib/decompress_inflate.c"