From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 718F8C433E2 for ; Sun, 28 Mar 2021 06:32:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 498E061981 for ; Sun, 28 Mar 2021 06:32:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231187AbhC1Gbz (ORCPT ); Sun, 28 Mar 2021 02:31:55 -0400 Received: from mail.kernel.org ([198.145.29.99]:56816 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230493AbhC1Gbc (ORCPT ); Sun, 28 Mar 2021 02:31:32 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 1BAC76191A; Sun, 28 Mar 2021 06:31:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1616913092; bh=QzKnPWoBnPHqdJHKCVpbj1BpTP2hO0zRu8JrhjYU+j0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oCRMri96fe/VV+ky4tT+TYgNgYdWWJzEgeXfW1Tvd/axc2XqcW9wem1Jg6EWGepv2 QjpcK6XDPVTYzlAGc9cBpGJNs76gqhECTTGkJoQEDk+3zXn3vooA/aHijGpPJOqIjA KaNg4iVmEpWEVc+v+reBWXGLdp/9vX3UPt6ESFnyGi8C3C85wjhdaSIOc2rHkvEjGU q/dKoB5wnBsLvoh7s8j/ZofobGS9h+hH0KO9HHec613wxtdvFuKWgCppj0bO1HPk6w BYMnDjrYcXcZ5Cd+KQpevDg06rlgh2/Yp6Q3kReMZDAa8puVTZfEmFJKn+m05xwAZ0 BuEJgjqjL8urw== From: guoren@kernel.org To: guoren@kernel.org Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-csky@vger.kernel.org, linux-arch@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-xtensa@linux-xtensa.org, openrisc@lists.librecores.org, sparclinux@vger.kernel.org, Guo Ren , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras Subject: [PATCH v5 4/7] powerpc/qspinlock: Add ARCH_USE_QUEUED_SPINLOCKS_XCHG32 Date: Sun, 28 Mar 2021 06:30:25 +0000 Message-Id: <1616913028-83376-5-git-send-email-guoren@kernel.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1616913028-83376-1-git-send-email-guoren@kernel.org> References: <1616913028-83376-1-git-send-email-guoren@kernel.org> Precedence: bulk List-ID: X-Mailing-List: linux-csky@vger.kernel.org From: Guo Ren We don't have native hw xchg16 instruction, so let qspinlock generic code to deal with it. Using the full-word atomic xchg instructions implement xchg16 has the semantic risk for atomic operations. This patch cancels the dependency of on qspinlock generic code on architecture's xchg16. Signed-off-by: Guo Ren Cc: Michael Ellerman Cc: Benjamin Herrenschmidt Cc: Paul Mackerras --- arch/powerpc/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 386ae12d8523..69ec4ade6521 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -151,6 +151,7 @@ config PPC select ARCH_USE_CMPXCHG_LOCKREF if PPC64 select ARCH_USE_QUEUED_RWLOCKS if PPC_QUEUED_SPINLOCKS select ARCH_USE_QUEUED_SPINLOCKS if PPC_QUEUED_SPINLOCKS + select ARCH_USE_QUEUED_SPINLOCKS_XCHG32 if PPC_QUEUED_SPINLOCKS select ARCH_WANT_IPC_PARSE_VERSION select ARCH_WANT_IRQS_OFF_ACTIVATE_MM select ARCH_WANT_LD_ORPHAN_WARN -- 2.17.1