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Fri, 21 Apr 2017 09:16:38 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 5AC56CDF96 Authentication-Results: ext-mx10.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx10.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=kraxel@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com 5AC56CDF96 Received: from nilsson.home.kraxel.org (ovpn-116-18.ams2.redhat.com [10.36.116.18]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1FFA077FFE; Fri, 21 Apr 2017 09:16:36 +0000 (UTC) Received: by nilsson.home.kraxel.org (Postfix, from userid 500) id B00DE81080; Fri, 21 Apr 2017 11:16:33 +0200 (CEST) From: Gerd Hoffmann To: qemu-devel@nongnu.org Date: Fri, 21 Apr 2017 11:16:24 +0200 Message-Id: <20170421091632.30900-2-kraxel@redhat.com> In-Reply-To: <20170421091632.30900-1-kraxel@redhat.com> References: <20170421091632.30900-1-kraxel@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Fri, 21 Apr 2017 09:16:38 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH 1/9] bitmap: add bitmap_copy_and_clear_atomic X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Gerd Hoffmann Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP Signed-off-by: Gerd Hoffmann --- include/qemu/bitmap.h | 2 ++ util/bitmap.c | 11 +++++++++++ 2 files changed, 13 insertions(+) diff --git a/include/qemu/bitmap.h b/include/qemu/bitmap.h index 63ea2d0b1e..c318da12d7 100644 --- a/include/qemu/bitmap.h +++ b/include/qemu/bitmap.h @@ -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, diff --git a/util/bitmap.c b/util/bitmap.c index c1a84ca5e3..efced9a7d8 100644 --- a/util/bitmap.c +++ b/util/bitmap.c @@ -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)) /**