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[2001:4830:134:3::11]) by mx.google.com with ESMTPS id y5si2905064ywa.137.2016.10.27.08.23.48 for (version=TLS1 cipher=AES128-SHA bits=128/128); Thu, 27 Oct 2016 08:23:48 -0700 (PDT) Received-SPF: pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 2001:4830:134:3::11 as permitted sender) client-ip=2001:4830:134:3::11; Authentication-Results: mx.google.com; dkim=fail header.i=@linaro.org; spf=pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 2001:4830:134:3::11 as permitted sender) smtp.mailfrom=qemu-devel-bounces+patch=linaro.org@nongnu.org; dmarc=fail (p=NONE dis=NONE) header.from=linaro.org Received: from localhost ([::1]:42262 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bzmWx-0005su-AG for patch@linaro.org; Thu, 27 Oct 2016 11:23:47 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:42644) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bzmKs-0004kt-2A for qemu-devel@nongnu.org; Thu, 27 Oct 2016 11:11:22 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bzmKo-0007jr-G5 for qemu-devel@nongnu.org; Thu, 27 Oct 2016 11:11:18 -0400 Received: from mail-wm0-x22d.google.com ([2a00:1450:400c:c09::22d]:35296) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1bzmKo-0007iz-9F for qemu-devel@nongnu.org; Thu, 27 Oct 2016 11:11:14 -0400 Received: by mail-wm0-x22d.google.com with SMTP id e69so40999673wmg.0 for ; Thu, 27 Oct 2016 08:11:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=zfE0Cu8f8UDvR0O6n4F3IP8cRGLvbEOGxcLH5szwz8M=; b=QyiSStYn0qm78Ohj5Xz26pAHZHHq9wTEN37dP2vwvpNT5igbPU11J67We+Vxan7dUp qlu6mrH2k0MDp3kvAeLEO1jUgsaGgqUKph+87WOlkql8C2pP1HpKeFjKasod3aSBdXvP aOaELTv44rnsYhrM9GqThx7E4tUBR1nS6UZAU= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=zfE0Cu8f8UDvR0O6n4F3IP8cRGLvbEOGxcLH5szwz8M=; b=jxzcIHo3FvJewNd6hi6tpptZG190M8AtkhqsJfTI/vikKWqKwWjnQilZ0Y3BMIbsRL 1vwJEijpY9nNpLrT2W9n/+DsVsRoGkXcnEXNPzEOUKiXN209RDjeHXh0JSM40EzvhTX0 DH5Fz7t4AvEYiEWTJu0xF95p4i+Y4vcPLZdHfQ+k4EMbm2CV6L3GyjjZKjugsx8xnwb/ HIlI0P2rSFKXaRAve0SB69axIxYZKeS3696xrVM1qS2PDjeoPgPcf6XBymy+xd29PDdj iytOXIHTYQCjpVDMRsAVXIg6pKzuqbfaLSN04aec8JnkCjHjbXMyoDPFIXICTuqQZmE7 nAXA== X-Gm-Message-State: ABUngvehwWsyufK1H77dtVrgIvXnMYvb5DB5cMj40yYwEqIOmfH07X31VguR/mq5eS3Wn5uo X-Received: by 10.28.12.77 with SMTP id 74mr9572303wmm.115.1477581073247; Thu, 27 Oct 2016 08:11:13 -0700 (PDT) Received: from zen.linaro.local ([81.128.185.34]) by smtp.gmail.com with ESMTPSA id za1sm9024900wjb.8.2016.10.27.08.11.06 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 27 Oct 2016 08:11:11 -0700 (PDT) Received: from zen.linaroharston (localhost [127.0.0.1]) by zen.linaro.local (Postfix) with ESMTP id C8C353E03FF; Thu, 27 Oct 2016 16:11:00 +0100 (BST) From: =?UTF-8?q?Alex=20Benn=C3=A9e?= To: pbonzini@redhat.com Date: Thu, 27 Oct 2016 16:10:19 +0100 Message-Id: <20161027151030.20863-23-alex.bennee@linaro.org> X-Mailer: git-send-email 2.10.1 In-Reply-To: <20161027151030.20863-1-alex.bennee@linaro.org> References: <20161027151030.20863-1-alex.bennee@linaro.org> MIME-Version: 1.0 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 2a00:1450:400c:c09::22d Subject: [Qemu-devel] [PATCH v5 22/33] atomic: introduce cmpxchg_bool 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: mttcg@listserver.greensocs.com, peter.maydell@linaro.org, claudio.fontana@huawei.com, nikunj@linux.vnet.ibm.com, jan.kiszka@siemens.com, mark.burton@greensocs.com, a.rigo@virtualopensystems.com, qemu-devel@nongnu.org, cota@braap.org, serge.fdrv@gmail.com, bobby.prani@gmail.com, rth@twiddle.net, =?UTF-8?q?Alex=20Benn=C3=A9e?= , fred.konrad@greensocs.com Errors-To: qemu-devel-bounces+patch=linaro.org@nongnu.org Sender: "Qemu-devel" This allows for slightly neater code when checking for success of a cmpxchg operation. Signed-off-by: Alex Bennée --- v4 (base-patches) - brought forward from ARM enabling patches - remove the un-needed extra temps --- include/qemu/atomic.h | 9 +++++++++ 1 file changed, 9 insertions(+) -- 2.10.1 diff --git a/include/qemu/atomic.h b/include/qemu/atomic.h index 49cf55f..bd74b75 100644 --- a/include/qemu/atomic.h +++ b/include/qemu/atomic.h @@ -205,6 +205,14 @@ atomic_cmpxchg__nocheck(ptr, old, new); \ }) +#define atomic_bool_cmpxchg(ptr, old, new) \ + ({ \ + typeof(*ptr) _old = (old), _new = (new); \ + __atomic_compare_exchange(ptr, &_old, &_new, false, \ + __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST); \ + }) + + /* Provide shorter names for GCC atomic builtins, return old value */ #define atomic_fetch_inc(ptr) __atomic_fetch_add(ptr, 1, __ATOMIC_SEQ_CST) #define atomic_fetch_dec(ptr) __atomic_fetch_sub(ptr, 1, __ATOMIC_SEQ_CST) @@ -432,6 +440,7 @@ #define atomic_cmpxchg(ptr, old, new) __sync_val_compare_and_swap(ptr, old, new) #define atomic_cmpxchg__nocheck(ptr, old, new) atomic_cmpxchg(ptr, old, new) +#define atomic_bool_cmpxchg(ptr, old, new) __sync_bool_compare_and_swap(ptr, old, new) /* And even shorter names that return void. */ #define atomic_inc(ptr) ((void) __sync_fetch_and_add(ptr, 1))