From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:43318) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gK0LZ-0002mQ-4H for qemu-devel@nongnu.org; Tue, 06 Nov 2018 07:20:41 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gK0LX-0001fE-88 for qemu-devel@nongnu.org; Tue, 06 Nov 2018 07:20:41 -0500 Received: from mail-pf1-x444.google.com ([2607:f8b0:4864:20::444]:43086) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1gK0LW-0001cT-3U for qemu-devel@nongnu.org; Tue, 06 Nov 2018 07:20:38 -0500 Received: by mail-pf1-x444.google.com with SMTP id g7-v6so3773271pfo.10 for ; Tue, 06 Nov 2018 04:20:37 -0800 (PST) From: guangrong.xiao@gmail.com Date: Tue, 6 Nov 2018 20:20:21 +0800 Message-Id: <20181106122025.3487-2-xiaoguangrong@tencent.com> In-Reply-To: <20181106122025.3487-1-xiaoguangrong@tencent.com> References: <20181106122025.3487-1-xiaoguangrong@tencent.com> Subject: [Qemu-devel] [PATCH v2 1/5] bitops: introduce change_bit_atomic List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: pbonzini@redhat.com, mst@redhat.com, mtosatti@redhat.com Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org, dgilbert@redhat.com, peterx@redhat.com, wei.w.wang@intel.com, jiang.biao2@zte.com.cn, eblake@redhat.com, quintela@redhat.com, cota@braap.org, Xiao Guangrong From: Xiao Guangrong It will be used by threaded workqueue Signed-off-by: Xiao Guangrong --- include/qemu/bitops.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/include/qemu/bitops.h b/include/qemu/bitops.h index 3f0926cf40..c522958852 100644 --- a/include/qemu/bitops.h +++ b/include/qemu/bitops.h @@ -79,6 +79,19 @@ static inline void change_bit(long nr, unsigned long *addr) *p ^= mask; } +/** + * change_bit_atomic - Toggle a bit in memory atomically + * @nr: Bit to change + * @addr: Address to start counting from + */ +static inline void change_bit_atomic(long nr, unsigned long *addr) +{ + unsigned long mask = BIT_MASK(nr); + unsigned long *p = addr + BIT_WORD(nr); + + atomic_xor(p, mask); +} + /** * test_and_set_bit - Set a bit and return its old value * @nr: Bit to set -- 2.14.5