Message ID | 20230118154450.73842-2-andrzej.hajda@intel.com (mailing list archive) |
---|---|
State | Handled Elsewhere |
Headers | show
Return-Path: <linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org> X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org (client-ip=112.213.38.117; helo=lists.ozlabs.org; envelope-from=linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org; receiver=<UNKNOWN>) Authentication-Results: legolas.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.a=rsa-sha256 header.s=Intel header.b=kRzthRqp; dkim-atps=neutral Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-384)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4Nxqqq03VLz23gM for <incoming@patchwork.ozlabs.org>; Thu, 19 Jan 2023 02:46:31 +1100 (AEDT) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4Nxqqp6FYjz3fBs for <incoming@patchwork.ozlabs.org>; Thu, 19 Jan 2023 02:46:30 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.a=rsa-sha256 header.s=Intel header.b=kRzthRqp; dkim-atps=neutral X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=intel.com (client-ip=192.55.52.93; helo=mga11.intel.com; envelope-from=andrzej.hajda@intel.com; receiver=<UNKNOWN>) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.a=rsa-sha256 header.s=Intel header.b=kRzthRqp; dkim-atps=neutral Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4NxqpS5Zpcz3cfP for <linuxppc-dev@lists.ozlabs.org>; Thu, 19 Jan 2023 02:45:20 +1100 (AEDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1674056721; x=1705592721; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=Z8X5newU9XL5BwcTC700iSbaht4sEux85LO6OUO0+Oc=; b=kRzthRqpaSUCB9rLpii3U1Tz8nmImHWHhiPazVlNMZzfgFHAJ0gpx1GJ kd/vB2z4CJN4EJcVPwTfwty2eZz7T4JWUKlZa/2V3R4qnM5zXXLTR+dnF 7Sn3QZn4GdLlCqkUx4+hnF7j09F01wsPEHKaYlJqLu27FKldBSWwkEI9Q TaV4elDY8KeZs90ooUkuiAHc8Gdz6PE0aZ1TbuS2tka8Y9XSUAWS4x/B9 eFn+i39vke+FzD04LmBD6kVu1F4+Tm0HbYzZpiXlGylpAHcO0phLZwdqF L8XRg+jGXIqxIwcOYtUI/3R1VIasW56MXEc4gZHAW4GyIR9YAxLLoWvsN A==; X-IronPort-AV: E=McAfee;i="6500,9779,10594"; a="322701232" X-IronPort-AV: E=Sophos;i="5.97,226,1669104000"; d="scan'208";a="322701232" Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Jan 2023 07:45:20 -0800 X-IronPort-AV: E=McAfee;i="6500,9779,10594"; a="661759280" X-IronPort-AV: E=Sophos;i="5.97,226,1669104000"; d="scan'208";a="661759280" Received: from lab-ah.igk.intel.com ([10.102.42.211]) by fmsmga007-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Jan 2023 07:45:14 -0800 From: Andrzej Hajda <andrzej.hajda@intel.com> To: linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-xtensa@linux-xtensa.org, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH v5 2/7] linux/include: add non-atomic version of xchg Date: Wed, 18 Jan 2023 16:44:45 +0100 Message-Id: <20230118154450.73842-2-andrzej.hajda@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230118154450.73842-1-andrzej.hajda@intel.com> References: <20230118153529.57695-1-andrzej.hajda@intel.com> <20230118154450.73842-1-andrzej.hajda@intel.com> MIME-Version: 1.0 Organization: Intel Technology Poland sp. z o.o. - ul. Slowackiego 173, 80-298 Gdansk - KRS 101882 - NIP 957-07-52-316 Content-Transfer-Encoding: 8bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List <linuxppc-dev.lists.ozlabs.org> List-Unsubscribe: <https://lists.ozlabs.org/options/linuxppc-dev>, <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=unsubscribe> List-Archive: <http://lists.ozlabs.org/pipermail/linuxppc-dev/> List-Post: <mailto:linuxppc-dev@lists.ozlabs.org> List-Help: <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=help> List-Subscribe: <https://lists.ozlabs.org/listinfo/linuxppc-dev>, <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=subscribe> Cc: Mark Rutland <mark.rutland@arm.com>, Arnd Bergmann <arnd@arndb.de>, Peter Zijlstra <peterz@infradead.org>, Boqun Feng <boqun.feng@gmail.com>, Andrzej Hajda <andrzej.hajda@intel.com>, Rodrigo Vivi <rodrigo.vivi@intel.com>, Andrew Morton <akpm@linux-foundation.org>, Andy Shevchenko <andriy.shevchenko@linux.intel.com> Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" <linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org> |
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Introduce __xchg, non-atomic xchg
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expand
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diff --git a/include/linux/non-atomic/xchg.h b/include/linux/non-atomic/xchg.h new file mode 100644 index 00000000000000..f7fa5dd746f37d --- /dev/null +++ b/include/linux/non-atomic/xchg.h @@ -0,0 +1,19 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_NON_ATOMIC_XCHG_H +#define _LINUX_NON_ATOMIC_XCHG_H + +/** + * __xchg - set variable pointed by @ptr to @val, return old value + * @ptr: pointer to affected variable + * @val: value to be written + * + * This is non-atomic variant of xchg. + */ +#define __xchg(ptr, val) ({ \ + __auto_type __ptr = ptr; \ + __auto_type __t = *__ptr; \ + *__ptr = (val); \ + __t; \ +}) + +#endif