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=-19.1 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=unavailable 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 3FBFDC47082 for ; Mon, 31 May 2021 15:47:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1BF3A61263 for ; Mon, 31 May 2021 15:47:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232637AbhEaPst (ORCPT ); Mon, 31 May 2021 11:48:49 -0400 Received: from mail.kernel.org ([198.145.29.99]:56128 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233712AbhEaO11 (ORCPT ); Mon, 31 May 2021 10:27:27 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 0C6AA61607; Mon, 31 May 2021 13:47:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1622468850; bh=eThF42QgHM2ceyuUbfHXSeQsf1W1pocY7rix57lF/sE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oc8WP5GslnIZ4qHriGAg5OYTUjyJomUBTVJVE+D01tR1wcfa+CD5VHxIL8DmD/TT9 zZ5tmTHJL27JgWq/hZE6YCjZxqNJPmbQyrIMBzscoIo7A5o90x11mZC/TQbIIMLzVX YE79krSE5DBVqQCdUSXAkfeUP33Ho5aZA5NeJxII= 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 5.4 125/177] openrisc: Define memory barrier mb Date: Mon, 31 May 2021 15:14:42 +0200 Message-Id: <20210531130652.245455529@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210531130647.887605866@linuxfoundation.org> References: <20210531130647.887605866@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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 */ -- 2.30.2