From nobody Sun Feb 8 21:47:29 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1551811232902511.6559851947768; Tue, 5 Mar 2019 10:40:32 -0800 (PST) Received: from localhost ([127.0.0.1]:47597 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1h1EzO-0003Ud-Ql for importer@patchew.org; Tue, 05 Mar 2019 13:40:30 -0500 Received: from eggs.gnu.org ([209.51.188.92]:49992) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1h1EcH-0001Ew-Ek for qemu-devel@nongnu.org; Tue, 05 Mar 2019 13:16:38 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1h1EcG-0001zn-I9 for qemu-devel@nongnu.org; Tue, 05 Mar 2019 13:16:37 -0500 Received: from mx1.redhat.com ([209.132.183.28]:37390) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1h1EcG-0001yu-Aw for qemu-devel@nongnu.org; Tue, 05 Mar 2019 13:16:36 -0500 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 79CB3308125E; Tue, 5 Mar 2019 18:16:35 +0000 (UTC) Received: from dgilbert-t580.localhost (ovpn-117-124.ams2.redhat.com [10.36.117.124]) by smtp.corp.redhat.com (Postfix) with ESMTP id EF6BB1001DC5; Tue, 5 Mar 2019 18:16:33 +0000 (UTC) From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, quintela@redhat.com, peterx@redhat.com, marcel.apfelbaum@gmail.com, wei.w.wang@intel.com, yury-kotov@yandex-team.ru, chen.zhang@intel.com Date: Tue, 5 Mar 2019 18:15:54 +0000 Message-Id: <20190305181602.9051-14-dgilbert@redhat.com> In-Reply-To: <20190305181602.9051-1-dgilbert@redhat.com> References: <20190305181602.9051-1-dgilbert@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.49]); Tue, 05 Mar 2019 18:16:35 +0000 (UTC) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PULL 13/21] bitmap: bitmap_count_one_with_offset 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: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Type: text/plain; charset="utf-8" From: Wei Wang Count the number of 1s in a bitmap starting from an offset. Signed-off-by: Wei Wang CC: Dr. David Alan Gilbert CC: Juan Quintela CC: Michael S. Tsirkin Reviewed-by: Dr. David Alan Gilbert Message-Id: <1544516693-5395-3-git-send-email-wei.w.wang@intel.com> Signed-off-by: Dr. David Alan Gilbert --- include/qemu/bitmap.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/include/qemu/bitmap.h b/include/qemu/bitmap.h index 679f1bdce4..5c313346b9 100644 --- a/include/qemu/bitmap.h +++ b/include/qemu/bitmap.h @@ -232,6 +232,19 @@ static inline long bitmap_count_one(const unsigned lon= g *bitmap, long nbits) } } =20 +static inline long bitmap_count_one_with_offset(const unsigned long *bitma= p, + long offset, long nbits) +{ + long aligned_offset =3D QEMU_ALIGN_DOWN(offset, BITS_PER_LONG); + long redundant_bits =3D offset - aligned_offset; + long bits_to_count =3D nbits + redundant_bits; + const unsigned long *bitmap_start =3D bitmap + + aligned_offset / BITS_PER_LONG; + + return bitmap_count_one(bitmap_start, bits_to_count) - + bitmap_count_one(bitmap_start, redundant_bits); +} + 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); --=20 2.20.1