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=-5.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 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 63D21C32774 for ; Fri, 27 Sep 2019 09:25:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3DC9320673 for ; Fri, 27 Sep 2019 09:25:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726912AbfI0JZ6 (ORCPT ); Fri, 27 Sep 2019 05:25:58 -0400 Received: from foss.arm.com ([217.140.110.172]:46824 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725890AbfI0JZ6 (ORCPT ); Fri, 27 Sep 2019 05:25:58 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id D62DB28; Fri, 27 Sep 2019 02:25:57 -0700 (PDT) Received: from arrakis.emea.arm.com (arrakis.cambridge.arm.com [10.1.196.78]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id D46393F534; Fri, 27 Sep 2019 02:25:56 -0700 (PDT) Date: Fri, 27 Sep 2019 10:25:54 +0100 From: Catalin Marinas To: Vincenzo Frascino Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, ard.biesheuvel@linaro.org, ndesaulniers@google.com, will@kernel.org, tglx@linutronix.de Subject: Re: [PATCH v3 2/5] arm64: vdso32: Detect binutils support for dmb ishld Message-ID: <20190927092554.GB20642@arrakis.emea.arm.com> References: <20190926214342.34608-1-vincenzo.frascino@arm.com> <20190926214342.34608-3-vincenzo.frascino@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190926214342.34608-3-vincenzo.frascino@arm.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Sep 26, 2019 at 10:43:39PM +0100, Vincenzo Frascino wrote: > As reported by Will Deacon, older versions of binutils that do not > support certain types of memory barriers can cause build failure of the > vdso32 library. > > Add a compilation time mechanism that detects if binutils supports those > instructions and configure the kernel accordingly. > > Cc: Will Deacon > Cc: Catalin Marinas > Signed-off-by: Vincenzo Frascino Reviewed-by: Catalin Marinas