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=-10.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 0BC9EC433E0 for ; Fri, 19 Mar 2021 12:34:40 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 5B43F64EE7 for ; Fri, 19 Mar 2021 12:34:39 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5B43F64EE7 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4F23Hd6gW0z3c6p for ; Fri, 19 Mar 2021 23:34:37 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=kernel.org (client-ip=198.145.29.99; helo=mail.kernel.org; envelope-from=cmarinas@kernel.org; receiver=) Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4F23HJ0bf6z30J9 for ; Fri, 19 Mar 2021 23:34:20 +1100 (AEDT) Received: by mail.kernel.org (Postfix) with ESMTPSA id 4C25964EB6; Fri, 19 Mar 2021 12:34:15 +0000 (UTC) Date: Fri, 19 Mar 2021 12:34:12 +0000 From: Catalin Marinas To: Anshuman Khandual Subject: Re: [PATCH V2] mm/memtest: Add ARCH_USE_MEMTEST Message-ID: <20210319123412.GB6832@arm.com> References: <1614573126-7740-1-git-send-email-anshuman.khandual@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1614573126-7740-1-git-send-email-anshuman.khandual@arm.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Chris Zankel , Thomas Bogendoerfer , linux-kernel@vger.kernel.org, Max Filippov , linux-xtensa@linux-xtensa.org, linuxppc-dev@lists.ozlabs.org, Russell King , linux-mips@vger.kernel.org, linux-mm@kvack.org, Ingo Molnar , Paul Mackerras , Thomas Gleixner , Will Deacon , linux-arm-kernel@lists.infradead.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Mon, Mar 01, 2021 at 10:02:06AM +0530, Anshuman Khandual wrote: > early_memtest() does not get called from all architectures. Hence enabling > CONFIG_MEMTEST and providing a valid memtest=[1..N] kernel command line > option might not trigger the memory pattern tests as would be expected in > normal circumstances. This situation is misleading. > > The change here prevents the above mentioned problem after introducing a > new config option ARCH_USE_MEMTEST that should be subscribed on platforms > that call early_memtest(), in order to enable the config CONFIG_MEMTEST. > Conversely CONFIG_MEMTEST cannot be enabled on platforms where it would > not be tested anyway. > > Cc: Russell King > Cc: Catalin Marinas > Cc: Will Deacon > Cc: Thomas Bogendoerfer > Cc: Michael Ellerman > Cc: Benjamin Herrenschmidt > Cc: Paul Mackerras > Cc: Thomas Gleixner > Cc: Ingo Molnar > Cc: Chris Zankel > Cc: Max Filippov > Cc: linux-arm-kernel@lists.infradead.org > Cc: linux-mips@vger.kernel.org > Cc: linuxppc-dev@lists.ozlabs.org > Cc: linux-xtensa@linux-xtensa.org > Cc: linux-mm@kvack.org > Cc: linux-kernel@vger.kernel.org > Reviewed-by: Max Filippov > Signed-off-by: Anshuman Khandual For arm64: Acked-by: Catalin Marinas