52 lines
1.7 KiB
Diff
52 lines
1.7 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Gerd Hoffmann <kraxel@redhat.com>
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Date: Fri, 21 Apr 2017 11:16:24 +0200
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Subject: [PATCH] bitmap: add bitmap_copy_and_clear_atomic
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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Message-id: 20170421091632.30900-2-kraxel@redhat.com
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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---
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include/qemu/bitmap.h | 2 ++
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util/bitmap.c | 11 +++++++++++
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2 files changed, 13 insertions(+)
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diff --git a/include/qemu/bitmap.h b/include/qemu/bitmap.h
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index 63ea2d0b1e..c318da12d7 100644
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--- a/include/qemu/bitmap.h
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+++ b/include/qemu/bitmap.h
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@@ -220,6 +220,8 @@ void bitmap_set(unsigned long *map, long i, long len);
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void bitmap_set_atomic(unsigned long *map, long i, long len);
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void bitmap_clear(unsigned long *map, long start, long nr);
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bool bitmap_test_and_clear_atomic(unsigned long *map, long start, long nr);
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+void bitmap_copy_and_clear_atomic(unsigned long *dst, unsigned long *src,
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+ long nr);
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unsigned long bitmap_find_next_zero_area(unsigned long *map,
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unsigned long size,
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unsigned long start,
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diff --git a/util/bitmap.c b/util/bitmap.c
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index c1a84ca5e3..efced9a7d8 100644
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--- a/util/bitmap.c
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+++ b/util/bitmap.c
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@@ -287,6 +287,17 @@ bool bitmap_test_and_clear_atomic(unsigned long *map, long start, long nr)
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return dirty != 0;
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}
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+void bitmap_copy_and_clear_atomic(unsigned long *dst, unsigned long *src,
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+ long nr)
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+{
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+ while (nr > 0) {
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+ *dst = atomic_xchg(src, 0);
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+ dst++;
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+ src++;
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+ nr -= BITS_PER_LONG;
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+ }
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+}
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+
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#define ALIGN_MASK(x,mask) (((x)+(mask))&~(mask))
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/**
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--
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2.11.0
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