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bitmap: add bitmap_copy_and_clear_atomic

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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 20170421091632.30900-2-kraxel@redhat.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2017-04-21 11:16:24 +02:00
parent a27450ec04
commit d6eb141392
2 changed files with 13 additions and 0 deletions
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2
include/qemu/bitmap.h
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@ -220,6 +220,8 @@ void bitmap_set(unsigned long *map, long i, long len);
void bitmap_set_atomic(unsigned long *map, long i, long len);
void bitmap_clear(unsigned long *map, long start, long nr);
bool bitmap_test_and_clear_atomic(unsigned long *map, long start, long nr);
void bitmap_copy_and_clear_atomic(unsigned long *dst, unsigned long *src,
long nr);
unsigned long bitmap_find_next_zero_area(unsigned long *map,
unsigned long size,
unsigned long start,

11
util/bitmap.c
View File

@ -287,6 +287,17 @@ bool bitmap_test_and_clear_atomic(unsigned long *map, long start, long nr)
return dirty != 0;
}
void bitmap_copy_and_clear_atomic(unsigned long *dst, unsigned long *src,
long nr)
{
while (nr > 0) {
*dst = atomic_xchg(src, 0);
dst++;
src++;
nr -= BITS_PER_LONG;
}
}
#define ALIGN_MASK(x,mask) (((x)+(mask))&~(mask))
/**