Commit d6eb1413 authored by Gerd Hoffmann's avatar Gerd Hoffmann
Browse files

bitmap: add bitmap_copy_and_clear_atomic 



Signed-off-by: default avatarGerd Hoffmann <kraxel@redhat.com>
Message-id: 20170421091632.30900-2-kraxel@redhat.com
Signed-off-by: default avatarGerd Hoffmann <kraxel@redhat.com>
parent a27450ec

include/qemu/bitmap.h

+2 −0
Original line number Diff line number Diff line
@@ -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,

util/bitmap.c

+11 −0
Original line number Diff line number Diff line
@@ -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))



/**