From patchwork Fri Jul 28 08:06:13 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Xu X-Patchwork-Id: 794722 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=2001:4830:134:3::11; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3xJhNY4Dw8z9s4q for ; Fri, 28 Jul 2017 18:10:21 +1000 (AEST) Received: from localhost ([::1]:46662 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1db0Lj-000339-5l for incoming@patchwork.ozlabs.org; Fri, 28 Jul 2017 04:10:19 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:46590) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1db0IY-0000Xw-OH for qemu-devel@nongnu.org; Fri, 28 Jul 2017 04:07:03 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1db0IX-0000tB-7j for qemu-devel@nongnu.org; Fri, 28 Jul 2017 04:07:02 -0400 Received: from mx1.redhat.com ([209.132.183.28]:55232) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1db0IX-0000sq-16 for qemu-devel@nongnu.org; Fri, 28 Jul 2017 04:07:01 -0400 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id E0E47F8021; Fri, 28 Jul 2017 08:06:59 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com E0E47F8021 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=fail smtp.mailfrom=peterx@redhat.com Received: from pxdev.xzpeter.org.com (dhcp-15-224.nay.redhat.com [10.66.15.224]) by smtp.corp.redhat.com (Postfix) with ESMTP id B5086600C2; Fri, 28 Jul 2017 08:06:57 +0000 (UTC) From: Peter Xu To: qemu-devel@nongnu.org Date: Fri, 28 Jul 2017 16:06:13 +0800 Message-Id: <1501229198-30588-5-git-send-email-peterx@redhat.com> In-Reply-To: <1501229198-30588-1-git-send-email-peterx@redhat.com> References: <1501229198-30588-1-git-send-email-peterx@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Fri, 28 Jul 2017 08:07:00 +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] [RFC 04/29] bitmap: introduce bitmap_invert() 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: Laurent Vivier , Andrea Arcangeli , Juan Quintela , Alexey Perevalov , peterx@redhat.com, "Dr . David Alan Gilbert" Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" It is used to invert the whole bitmap. Signed-off-by: Peter Xu --- include/qemu/bitmap.h | 10 ++++++++++ util/bitmap.c | 13 +++++++++++++ 2 files changed, 23 insertions(+) diff --git a/include/qemu/bitmap.h b/include/qemu/bitmap.h index c318da1..460d899 100644 --- a/include/qemu/bitmap.h +++ b/include/qemu/bitmap.h @@ -82,6 +82,7 @@ int slow_bitmap_andnot(unsigned long *dst, const unsigned long *bitmap1, const unsigned long *bitmap2, long bits); int slow_bitmap_intersects(const unsigned long *bitmap1, const unsigned long *bitmap2, long bits); +void slow_bitmap_invert(unsigned long *bitmap, long nbits); static inline unsigned long *bitmap_try_new(long nbits) { @@ -216,6 +217,15 @@ static inline int bitmap_intersects(const unsigned long *src1, } } +static inline void bitmap_invert(unsigned long *bitmap, long nbits) +{ + if (small_nbits(nbits)) { + *bitmap ^= BITMAP_LAST_WORD_MASK(nbits); + } else { + slow_bitmap_invert(bitmap, nbits); + } +} + 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); diff --git a/util/bitmap.c b/util/bitmap.c index efced9a..9b7408c 100644 --- a/util/bitmap.c +++ b/util/bitmap.c @@ -355,3 +355,16 @@ int slow_bitmap_intersects(const unsigned long *bitmap1, } return 0; } + +void slow_bitmap_invert(unsigned long *bitmap, long nbits) +{ + long k, lim = nbits/BITS_PER_LONG; + + for (k = 0; k < lim; k++) { + bitmap[k] ^= ULONG_MAX; + } + + if (nbits % BITS_PER_LONG) { + bitmap[k] ^= BITMAP_LAST_WORD_MASK(nbits); + } +}