diff mbox series

[03/12] tools: sync BITMAP_LAST_WORD_MASK() macro with the kernel

Message ID 20210321215457.588554-4-yury.norov@gmail.com (mailing list archive)
State New, archived
Headers show
Series lib/find_bit: fast path for small bitmaps | expand

Commit Message

Yury Norov March 21, 2021, 9:54 p.m. UTC 
Kernel version generates better code.

Signed-off-by: Yury Norov <yury.norov@gmail.com>
---
 tools/include/linux/bitmap.h | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)
diff mbox series

Patch

diff --git a/tools/include/linux/bitmap.h b/tools/include/linux/bitmap.h
index 7cbd23e56d48..4aabc23ec747 100644
--- a/tools/include/linux/bitmap.h
+++ b/tools/include/linux/bitmap.h
@@ -20,12 +20,7 @@  int __bitmap_equal(const unsigned long *bitmap1,
 void bitmap_clear(unsigned long *map, unsigned int start, int len);
 
 #define BITMAP_FIRST_WORD_MASK(start) (~0UL << ((start) & (BITS_PER_LONG - 1)))
-
-#define BITMAP_LAST_WORD_MASK(nbits)					\
-(									\
-	((nbits) % BITS_PER_LONG) ?					\
-		(1UL<<((nbits) % BITS_PER_LONG))-1 : ~0UL		\
-)
+#define BITMAP_LAST_WORD_MASK(nbits) (~0UL >> (-(nbits) & (BITS_PER_LONG - 1)))
 
 #define small_const_nbits(nbits) \
 	(__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG)