From patchwork Mon May 31 13:14:24 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 451242 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=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, 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 C69D5C47082 for ; Mon, 31 May 2021 13:35:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A9DC96192F for ; Mon, 31 May 2021 13:35:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232475AbhEaNgg (ORCPT ); Mon, 31 May 2021 09:36:36 -0400 Received: from mail.kernel.org ([198.145.29.99]:40248 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232723AbhEaNeY (ORCPT ); Mon, 31 May 2021 09:34:24 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 13A3A61400; Mon, 31 May 2021 13:24:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1622467499; bh=eThF42QgHM2ceyuUbfHXSeQsf1W1pocY7rix57lF/sE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ktSBQkRxKPSoTABscIdKP+s+V/wCIBoe6YhhcsHjsO3adHXxuzGJcxXzWTwJC5VHI 2ZVWxymnrNbzxRKwBa67uCN330NGrMmJol+oMPC+bWGe0E6FThar+uEIGBIy0tvVP2 uy5bhjzjx7gHG2NSPjqgCnTenLj3JCBYChzRGroE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Peter Zijlstra , Stafford Horne , Sasha Levin Subject: [PATCH 4.19 088/116] openrisc: Define memory barrier mb Date: Mon, 31 May 2021 15:14:24 +0200 Message-Id: <20210531130643.128560431@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210531130640.131924542@linuxfoundation.org> References: <20210531130640.131924542@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Peter Zijlstra [ Upstream commit 8b549c18ae81dbc36fb11e4aa08b8378c599ca95 ] This came up in the discussion of the requirements of qspinlock on an architecture. OpenRISC uses qspinlock, but it was noticed that the memmory barrier was not defined. Peter defined it in the mail thread writing: As near as I can tell this should do. The arch spec only lists this one instruction and the text makes it sound like a completion barrier. This is correct so applying this patch. Signed-off-by: Peter Zijlstra [shorne@gmail.com:Turned the mail into a patch] Signed-off-by: Stafford Horne Signed-off-by: Sasha Levin --- arch/openrisc/include/asm/barrier.h | 9 +++++++++ 1 file changed, 9 insertions(+) create mode 100644 arch/openrisc/include/asm/barrier.h diff --git a/arch/openrisc/include/asm/barrier.h b/arch/openrisc/include/asm/barrier.h new file mode 100644 index 000000000000..7538294721be --- /dev/null +++ b/arch/openrisc/include/asm/barrier.h @@ -0,0 +1,9 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ASM_BARRIER_H +#define __ASM_BARRIER_H + +#define mb() asm volatile ("l.msync" ::: "memory") + +#include + +#endif /* __ASM_BARRIER_H */