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bitmap: add bitmap_copy_and_clear_atomic

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Backports commit d6eb1413920affb7be3df9982682dd183a805dd7 from qemu
This commit is contained in:
Gerd Hoffmann 2018-03-02 15:08:38 -05:00 committed by Lioncash
parent b8b70dfcd2
commit 108354cc4a
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GPG key ID: 4E3C3CC1031BA9C7
2 changed files with 13 additions and 0 deletions
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2
qemu/include/qemu/bitmap.h
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@ -67,6 +67,8 @@ void bitmap_set(unsigned long *map, long i, long len);
void bitmap_set_atomic(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); void bitmap_clear(unsigned long *map, long start, long nr);
bool bitmap_test_and_clear_atomic(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);
static inline unsigned long *bitmap_zero_extend(unsigned long *old, static inline unsigned long *bitmap_zero_extend(unsigned long *old,
long old_nbits, long new_nbits) long old_nbits, long new_nbits)

11
qemu/util/bitmap.c
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@ -137,3 +137,14 @@ bool bitmap_test_and_clear_atomic(unsigned long *map, long start, long nr)
return dirty != 0; 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;
}
}