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| author | Wei Yang | 2016-03-05 14:47:08 +0100 |
|---|---|---|
| committer | Michael Tokarev | 2016-10-08 10:25:29 +0200 |
| commit | cb57fb37051b11d04f1ddce736b0ec3f936e978e (patch) | |
| tree | 83b9551dfd911cc2d13a1e5a6f4526be06c79727 /include | |
| parent | build-sys: fix find-in-path (diff) | |
| download | qemu-cb57fb37051b11d04f1ddce736b0ec3f936e978e.tar.gz qemu-cb57fb37051b11d04f1ddce736b0ec3f936e978e.tar.xz qemu-cb57fb37051b11d04f1ddce736b0ec3f936e978e.zip | |
bitmap: refine and move BITMAP_{FIRST/LAST}_WORD_MASK
According to linux kernel commit <89c1e79eb30> ("linux/bitmap.h: improve
BITMAP_{LAST,FIRST}_WORD_MASK"), these two macro could be improved.
This patch takes this change and also move them all in header file.
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Diffstat (limited to 'include')
| -rw-r--r-- | include/qemu/bitmap.h | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/include/qemu/bitmap.h b/include/qemu/bitmap.h index 7247f14788..63ea2d0b1e 100644 --- a/include/qemu/bitmap.h +++ b/include/qemu/bitmap.h @@ -57,11 +57,8 @@ * find_next_bit(addr, nbits, bit) Position next set bit in *addr >= bit */ -#define BITMAP_LAST_WORD_MASK(nbits) \ - ( \ - ((nbits) % BITS_PER_LONG) ? \ - (1UL<<((nbits) % BITS_PER_LONG))-1 : ~0UL \ - ) +#define BITMAP_FIRST_WORD_MASK(start) (~0UL << ((start) & (BITS_PER_LONG - 1))) +#define BITMAP_LAST_WORD_MASK(nbits) (~0UL >> (-(nbits) & (BITS_PER_LONG - 1))) #define DECLARE_BITMAP(name,bits) \ unsigned long name[BITS_TO_LONGS(bits)] |