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=-12.9 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 BEFEFC433DF for ; Wed, 19 Aug 2020 02:19:48 +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 6D79F205CB for ; Wed, 19 Aug 2020 02:19:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=ellerman.id.au header.i=@ellerman.id.au header.b="eWILLNuc" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6D79F205CB 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 bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 4BWWh23V3wzDqgl for ; Wed, 19 Aug 2020 12:19:46 +1000 (AEST) Received: from ozlabs.org (bilbo.ozlabs.org [203.11.71.1]) (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 4BWWBW2D1jzDqsJ for ; Wed, 19 Aug 2020 11:57:39 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=ellerman.id.au Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=ellerman.id.au header.i=@ellerman.id.au header.a=rsa-sha256 header.s=201909 header.b=eWILLNuc; dkim-atps=neutral Received: by ozlabs.org (Postfix) id 4BWWBV6cZLz9sTh; Wed, 19 Aug 2020 11:57:38 +1000 (AEST) Received: by ozlabs.org (Postfix, from userid 1034) id 4BWWBV3GnYz9sPC; Wed, 19 Aug 2020 11:57:38 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ellerman.id.au; s=201909; t=1597802258; bh=cg3JR+bqlURCqAhQVg3WYomdlbqrlo9Tkf3uzP0k2LE=; h=From:To:Subject:Date:In-Reply-To:References:From; b=eWILLNucMDOyLY3RiNSD5sfIqrR6AbhrglC4Egdq2kUgAEX+Fw6F18IC7N5LdPVtO 4qNuOSVPwKtDprRBzbedxYlFIX93aoJmLU+NW6s+5wx/V3zJL+g2aUtQiwc8PWduVf 5yAaYva0T9TkhCtyCrl9u+9caUWy9aTSCdb0tdjeYy/Sftvsht3FkkkN3gBt9ZdfSt 6CTzNQVujoQZqpSOaH8lsv2Q9vtXAx84R4qzTq5gT/kcN9HoeaIi6SN1RaTr1L1U3P DGQSqR/bXz4CuxsXdiMZUX3Synr+DVtqPcrNR9bq4kn4r4HXY+zWPbEYPLECy/s3Zu s1ZnIGEoeGRNQ== From: Michael Ellerman To: linuxppc-dev@ozlabs.org Subject: [PATCH 8/9] selftests/powerpc: Don't touch VMX/VSX on older CPUs Date: Wed, 19 Aug 2020 11:57:26 +1000 Message-Id: <20200819015727.1977134-8-mpe@ellerman.id.au> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200819015727.1977134-1-mpe@ellerman.id.au> References: <20200819015727.1977134-1-mpe@ellerman.id.au> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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: , Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" If we're running on a CPU without VMX/VSX then don't touch them. This is fragile, the compiler could spill a VMX/VSX register and break the test anyway. But in practice it seems to work, ie. the test runs to completion on a system without VSX with this change. Signed-off-by: Michael Ellerman --- tools/testing/selftests/powerpc/benchmarks/context_switch.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/tools/testing/selftests/powerpc/benchmarks/context_switch.c b/tools/testing/selftests/powerpc/benchmarks/context_switch.c index d50cc05df495..96554e2794d1 100644 --- a/tools/testing/selftests/powerpc/benchmarks/context_switch.c +++ b/tools/testing/selftests/powerpc/benchmarks/context_switch.c @@ -481,6 +481,12 @@ int main(int argc, char *argv[]) else printf("futex"); + if (!have_hwcap(PPC_FEATURE_HAS_ALTIVEC)) + touch_altivec = 0; + + if (!have_hwcap(PPC_FEATURE_HAS_VSX)) + touch_vector = 0; + printf(" on cpus %d/%d touching FP:%s altivec:%s vector:%s vdso:%s\n", cpu1, cpu2, touch_fp ? "yes" : "no", touch_altivec ? "yes" : "no", touch_vector ? "yes" : "no", touch_vdso ? "yes" : "no"); -- 2.25.1