From patchwork Fri Oct 21 06:48:22 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Liang Li X-Patchwork-Id: 9388147 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 49669607D0 for ; Fri, 21 Oct 2016 07:05:55 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3659129D80 for ; Fri, 21 Oct 2016 07:05:55 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 278A929E4D; Fri, 21 Oct 2016 07:05:55 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id AF71D29D80 for ; Fri, 21 Oct 2016 07:05:54 +0000 (UTC) Received: from localhost ([::1]:59092 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bxTtq-0005AJ-1M for patchwork-qemu-devel@patchwork.kernel.org; Fri, 21 Oct 2016 03:05:54 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:42421) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bxTpG-0001pt-Fi for qemu-devel@nongnu.org; Fri, 21 Oct 2016 03:01:11 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bxTpA-0008UL-Vm for qemu-devel@nongnu.org; Fri, 21 Oct 2016 03:01:10 -0400 Received: from mga04.intel.com ([192.55.52.120]:30166) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1bxTpA-0008SE-N2 for qemu-devel@nongnu.org; Fri, 21 Oct 2016 03:01:04 -0400 Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga104.fm.intel.com with ESMTP; 21 Oct 2016 00:00:55 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos; i="5.31,375,1473145200"; d="scan'208"; a="1057010850" Received: from ll.sh.intel.com (HELO localhost) ([10.239.13.123]) by fmsmga001.fm.intel.com with ESMTP; 21 Oct 2016 00:00:53 -0700 From: Liang Li To: qemu-devel@nongnu.org Date: Fri, 21 Oct 2016 14:48:22 +0800 Message-Id: <1477032504-12745-5-git-send-email-liang.z.li@intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1477032504-12745-1-git-send-email-liang.z.li@intel.com> References: <1477032504-12745-1-git-send-email-liang.z.li@intel.com> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 192.55.52.120 Subject: [Qemu-devel] [PATCH qemu v3 4/6] bitmap: Add a new bitmap_move function 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: virtio-dev@lists.oasis-open.org, thuth@redhat.com, Liang Li , kvm@vger.kernel.org, quintela@redhat.com, mst@redhat.com, dgilbert@redhat.com, dave.hansen@intel.com, amit.shah@redhat.com, pbonzini@redhat.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP Sometimes, it is need to move a portion of bitmap to another place in a large bitmap, if overlap happens, the bitmap_copy can't not work correctly, we need a new function to do this work. Signed-off-by: Liang Li --- include/qemu/bitmap.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/include/qemu/bitmap.h b/include/qemu/bitmap.h index 63ea2d0..775d05e 100644 --- a/include/qemu/bitmap.h +++ b/include/qemu/bitmap.h @@ -37,6 +37,7 @@ * bitmap_set(dst, pos, nbits) Set specified bit area * bitmap_set_atomic(dst, pos, nbits) Set specified bit area with atomic ops * bitmap_clear(dst, pos, nbits) Clear specified bit area + * bitmap_move(dst, src, nbits) Move *src to *dst * bitmap_test_and_clear_atomic(dst, pos, nbits) Test and clear area * bitmap_find_next_zero_area(buf, len, pos, n, mask) Find bit free area */ @@ -129,6 +130,18 @@ static inline void bitmap_copy(unsigned long *dst, const unsigned long *src, } } +static inline void bitmap_move(unsigned long *dst, const unsigned long *src, + long nbits) +{ + if (small_nbits(nbits)) { + unsigned long tmp = *src; + *dst = tmp; + } else { + long len = BITS_TO_LONGS(nbits) * sizeof(unsigned long); + memmove(dst, src, len); + } +} + static inline int bitmap_and(unsigned long *dst, const unsigned long *src1, const unsigned long *src2, long nbits) {