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=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS 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 813FDC5B57E for ; Sun, 30 Jun 2019 08:54:31 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (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 3695320449 for ; Sun, 30 Jun 2019 08:54:31 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3695320449 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ellerman.id.au Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 45c47T52hczDr6Z for ; Sun, 30 Jun 2019 18:54:29 +1000 (AEST) Received: from ozlabs.org (bilbo.ozlabs.org [IPv6:2401:3900:2:1::2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 45c3lv2hLLzDqhl for ; Sun, 30 Jun 2019 18:37:31 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=ellerman.id.au Received: by ozlabs.org (Postfix, from userid 1034) id 45c3lv0rTwz9sND; Sun, 30 Jun 2019 18:37:30 +1000 (AEST) X-powerpc-patch-notification: thanks X-powerpc-patch-commit: 8d0f1e05ab16c4bd628ddaefd20b94ffb36d799c X-Patchwork-Hint: ignore In-Reply-To: <1560806698-26651-1-git-send-email-gromero@linux.vnet.ibm.com> To: Gustavo Romero , linuxppc-dev@lists.ozlabs.org From: Michael Ellerman Subject: Re: [PATCH] selftests/powerpc: Fix earlyclobber in tm-vmxcopy Message-Id: <45c3lv0rTwz9sND@ozlabs.org> Date: Sun, 30 Jun 2019 18:37:30 +1000 (AEST) 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: mikey@neuling.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Mon, 2019-06-17 at 21:24:58 UTC, Gustavo Romero wrote: > In some cases, compiler can allocate the same register for operand 'res' > and 'vecoutptr', resulting in segfault at 'stxvd2x 40,0,%[vecoutptr]' > because base register will contain 1, yielding a false-positive. > > This is because output 'res' must be marked as an earlyclobber operand so > it may not overlap an input operand ('vecoutptr'). > > Signed-off-by: Gustavo Romero > Reviewed-by: Segher Boessenkool Applied to powerpc next, thanks. https://git.kernel.org/powerpc/c/8d0f1e05ab16c4bd628ddaefd20b94ffb36d799c cheers