Received: by 2002:a05:6a10:1d13:0:0:0:0 with SMTP id pp19csp1319888pxb; Fri, 27 Aug 2021 06:24:51 -0700 (PDT) X-Google-Smtp-Source: ABdhPJw9GDgrlwPRKUHiV+ipMHmDD+fZqZTxXqroT5LVUEUxsSUvV56WY8WmNZWLiQO9G4U3wQSj X-Received: by 2002:a17:906:c085:: with SMTP id f5mr10158506ejz.250.1630070691354; Fri, 27 Aug 2021 06:24:51 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1630070691; cv=none; d=google.com; s=arc-20160816; b=qBtTNsNz5LB6knW73SSf+1xb1ApP/w12r6MFO0A7Bd/70XaV84a1YWBv5C7/FXeGVX hCV2uGzGjz3LGrC5qOaPpgPLjdKfUO4Yy9PvrO8lQ9XCKRPg8mOVsPmjGgPgtncAg/rw DCOyyKk54XnUHuTgJKO9f1Q4Xm51temN8S1k3jsDmrdwchuNjMunuPRTxuQCn/4weh4u uHxlEDWlb0HJGDXw4gf60hiRwiOIBf09oUukJwX/gs1SludRoEQ5R1hCLJsZPFMz5DXd 9Nw+YfQxziLZ+PttbWAdBvcqmz44FesphkuzxnAGiQhxkNhbixBh98GcpVZVLAvY3qTG kn4Q== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version:date :message-id:subject:references:in-reply-to:cc:to:from; bh=oxv4obMlU8N/nFVlJIehsDYWn9m6qptRvC86ujJT4KA=; b=K6WsKw+KM71BPpL814SqaysVM+buOSJRDkLfbp1G25YNl7Go/iE0/5mTQbqsd2urnv frp3SROXg1SO1ofPDg4F+4VxJZDc4lQMFK5GnyGRTCwT+cqtXRZ5OoJIU4zWsnnMeFyq i8zkYAAXLG0JvHxUPmw1q9txcwLpoQ2bfgmiHuHb+t+fsbzahWQapbm5jWHYry5NVOfI 35CdaIXQuo15gcvcAEwOsVmLPJGaFb9ndE2PUrIHCH/be7N6d5bWbNkP3/scBapqZ+mG QJ4YJZwKuHuKSfu5dgteFC2HWLgJ1WBzlIrHTLWqJw6h4yiXt/fUMuGzXB+dwBNQbQYg FMJg== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id n15si7365521edy.328.2021.08.27.06.24.26; Fri, 27 Aug 2021 06:24:51 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S245186AbhH0NX0 (ORCPT + 99 others); Fri, 27 Aug 2021 09:23:26 -0400 Received: from ozlabs.org ([203.11.71.1]:57469 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S245314AbhH0NXE (ORCPT ); Fri, 27 Aug 2021 09:23:04 -0400 Received: from authenticated.ozlabs.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mail.ozlabs.org (Postfix) with ESMTPSA id 4Gx0kG1Lftz9sVw; Fri, 27 Aug 2021 23:22:14 +1000 (AEST) From: Michael Ellerman To: Michael Ellerman , Christophe Leroy , Paul Mackerras , Benjamin Herrenschmidt Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org In-Reply-To: References: Subject: Re: [PATCH v2] powerpc: Avoid link stack corruption in misc asm functions Message-Id: <163007015730.52768.16250473929486782356.b4-ty@ellerman.id.au> Date: Fri, 27 Aug 2021 23:15:57 +1000 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 On Tue, 24 Aug 2021 07:56:35 +0000 (UTC), Christophe Leroy wrote: > bl;mflr is used at several places to get code position. > > Use bcl 20,31,+4 instead of bl in order to preserve link stack. > > See commit c974809a26a1 ("powerpc/vdso: Avoid link stack corruption > in __get_datapage()") for details. > > [...] Applied to powerpc/next. [1/1] powerpc: Avoid link stack corruption in misc asm functions https://git.kernel.org/powerpc/c/33e1402435cb9f3021439a15935ea2dc69ec1844 cheers