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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>
This commit is contained in:
Wei Yang 2016-03-05 13:47:08 +00:00 committed by Michael Tokarev
parent 88071589e8
commit cb57fb3705
2 changed files with 2 additions and 7 deletions
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7
include/qemu/bitmap.h
View File

@ -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)]

2
util/bitmap.c
View File

@ -157,8 +157,6 @@ int slow_bitmap_andnot(unsigned long *dst, const unsigned long *bitmap1,
return result != 0;
}
#define BITMAP_FIRST_WORD_MASK(start) (~0UL << ((start) % BITS_PER_LONG))
void bitmap_set(unsigned long *map, long start, long nr)
{
unsigned long *p = map + BIT_WORD(start);