Message ID | 20230518131013.3366406-23-guoren@kernel.org |
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State | New |
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[2620:137:e000::1:20]) by mx.google.com with ESMTP id g187-20020a636bc4000000b00528ca427963si1395033pgc.709.2023.05.18.06.36.09; Thu, 18 May 2023 06:36:24 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=U6EWjbah; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231704AbjERNQp (ORCPT <rfc822;pacteraone@gmail.com> + 99 others); Thu, 18 May 2023 09:16:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47168 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231687AbjERNQI (ORCPT <rfc822;linux-kernel@vger.kernel.org>); Thu, 18 May 2023 09:16:08 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 39F822105; Thu, 18 May 2023 06:15:41 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 0FC2C64F51; Thu, 18 May 2023 13:14:57 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 67B72C4339C; Thu, 18 May 2023 13:14:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1684415696; bh=lQTH6fQXqgDOV13+OOf/m8+ReoWieEMsKkpHvX1KsBk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=U6EWjbahGfHXvROjB2vQAPwqJYGK9YXMzzTxQLwkq71y9CcePnOM9o0N6RgIJxBAA iTUw77TFtCy266dawOWVsx7sYBg81q/acOunzlByttuu/7hUXMU6bAdWUJ7eOvEQgU 3It9oF8OK6aVWRyoLzt3nCb15zQ4TaRdM2/T7/NKOFw0Jcs8EDOLPfiSuZYUmrZnzE fbsFQvX+QYCwyd2VkmID9Zbj0EnVj2cHi1nzb1M6HAeGrGFDVk/Au69twErCk4x7+s JeniPBb8OhNwQRv4lKBbLI+UqzRKL20bsZWqfA8S6smJl087/UeJQBxf7ivFSyJJGH lfg8CnyC2mhlA== From: guoren@kernel.org To: arnd@arndb.de, guoren@kernel.org, palmer@rivosinc.com, tglx@linutronix.de, peterz@infradead.org, luto@kernel.org, conor.dooley@microchip.com, heiko@sntech.de, jszhang@kernel.org, chenhuacai@kernel.org, apatel@ventanamicro.com, atishp@atishpatra.org, mark.rutland@arm.com, bjorn@kernel.org, paul.walmsley@sifive.com, catalin.marinas@arm.com, will@kernel.org, rppt@kernel.org, anup@brainfault.org, shihua@iscas.ac.cn, jiawei@iscas.ac.cn, liweiwei@iscas.ac.cn, luxufan@iscas.ac.cn, chunyu@iscas.ac.cn, tsu.yubo@gmail.com, wefu@redhat.com, wangjunqiang@iscas.ac.cn, kito.cheng@sifive.com, andy.chiu@sifive.com, vincent.chen@sifive.com, greentime.hu@sifive.com, corbet@lwn.net, wuwei2016@iscas.ac.cn, jrtc27@jrtc27.com Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, Guo Ren <guoren@linux.alibaba.com> Subject: [RFC PATCH 22/22] riscv: s64ilp32: Temporary workaround solution to gcc problem Date: Thu, 18 May 2023 09:10:13 -0400 Message-Id: <20230518131013.3366406-23-guoren@kernel.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20230518131013.3366406-1-guoren@kernel.org> References: <20230518131013.3366406-1-guoren@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: <linux-kernel.vger.kernel.org> X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1766239223675472002?= X-GMAIL-MSGID: =?utf-8?q?1766239223675472002?= |
Series |
riscv: s64ilp32: Running 32-bit Linux kernel on 64-bit supervisor mode
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Commit Message
Guo Ren
May 18, 2023, 1:10 p.m. UTC
From: Guo Ren <guoren@linux.alibaba.com> There is an existing problem in 64ilp32 gcc that combines two pointers in one register. Liao is solving that problem. Before he finishes the job, we could prevent it with a simple noinline attribute, fortunately. struct path { struct vfsmount *mnt; struct dentry *dentry; } __randomize_layout; struct nameidata { struct path path; struct qstr last; struct path root; ... } __randomize_layout; struct nameidata *nd ... nd->path = nd->root; 6c88 ld a0,24(s1) ^^ // Wrong arg of mntget e088 sd a0,0(s1) // Need inserting "lw a0,0(s1)" here mntget(path->mnt); 2a6150ef jal c01ce946 <mntget> Any gcc helps are welcome :) Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Signed-off-by: Guo Ren <guoren@kernel.org> Cc: LiaoShihua <shihua@iscas.ac.cn> --- fs/namei.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/namei.c b/fs/namei.c index edfedfbccaef..22a2ef77e074 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -541,7 +541,7 @@ EXPORT_SYMBOL(inode_permission); * * Given a path increment the reference count to the dentry and the vfsmount. */ -void path_get(const struct path *path) +void noinline path_get(const struct path *path) { mntget(path->mnt); dget(path->dentry);