debian/patches/extra/0006-bitmap-add-bitmap_copy_and_clear_atomic.patch

   1 From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
   2 From: Gerd Hoffmann <kraxel@redhat.com>
   3 Date: Fri, 21 Apr 2017 11:16:24 +0200
   4 Subject: [PATCH] bitmap: add bitmap_copy_and_clear_atomic
   5
   6 Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
   7 Message-id: 20170421091632.30900-2-kraxel@redhat.com
   8 Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
   9 ---
  10  include/qemu/bitmap.h |  2 ++
  11  util/bitmap.c         | 11 +++++++++++
  12  2 files changed, 13 insertions(+)
  13
  14 diff --git a/include/qemu/bitmap.h b/include/qemu/bitmap.h
  15 index 63ea2d0b1e..c318da12d7 100644
  16 --- a/include/qemu/bitmap.h
  17 +++ b/include/qemu/bitmap.h
  18 @@ -220,6 +220,8 @@ void bitmap_set(unsigned long *map, long i, long len);
  19  void bitmap_set_atomic(unsigned long *map, long i, long len);
  20  void bitmap_clear(unsigned long *map, long start, long nr);
  21  bool bitmap_test_and_clear_atomic(unsigned long *map, long start, long nr);
  22 +void bitmap_copy_and_clear_atomic(unsigned long *dst, unsigned long *src,
  23 +                                  long nr);
  24  unsigned long bitmap_find_next_zero_area(unsigned long *map,
  25                                           unsigned long size,
  26                                           unsigned long start,
  27 diff --git a/util/bitmap.c b/util/bitmap.c
  28 index c1a84ca5e3..efced9a7d8 100644
  29 --- a/util/bitmap.c
  30 +++ b/util/bitmap.c
  31 @@ -287,6 +287,17 @@ bool bitmap_test_and_clear_atomic(unsigned long *map, long start, long nr)
  32      return dirty != 0;
  33  }
  34
  35 +void bitmap_copy_and_clear_atomic(unsigned long *dst, unsigned long *src,
  36 +                                  long nr)
  37 +{
  38 +    while (nr > 0) {
  39 +        *dst = atomic_xchg(src, 0);
  40 +        dst++;
  41 +        src++;
  42 +        nr -= BITS_PER_LONG;
  43 +    }
  44 +}
  45 +
  46  #define ALIGN_MASK(x,mask)      (((x)+(mask))&~(mask))
  47
  48  /**
  49 --
  50 2.11.0
  51