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=-8.8 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 4204EC43331 for ; Thu, 26 Mar 2020 12:11:42 +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 E85682073E for ; Thu, 26 Mar 2020 12:11:41 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E85682073E 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 48p3kM00hyzDqpL for ; Thu, 26 Mar 2020 23:11:39 +1100 (AEDT) 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 48p3cJ5vGpzDqsR for ; Thu, 26 Mar 2020 23:06:24 +1100 (AEDT) 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 48p3cH4SZ2z9sRY; Thu, 26 Mar 2020 23:06:23 +1100 (AEDT) X-powerpc-patch-notification: thanks X-powerpc-patch-commit: 915b7f6f9a5e232c138bb36743a1fdb0fcf2c432 In-Reply-To: <20200211033831.11165-2-gustavold@linux.ibm.com> To: Gustavo Luiz Duarte , linuxppc-dev@lists.ozlabs.org From: Michael Ellerman Subject: Re: [PATCH v3 2/3] selftests/powerpc: Add tm-signal-pagefault test Message-Id: <48p3cH4SZ2z9sRY@ozlabs.org> Date: Thu, 26 Mar 2020 23:06:23 +1100 (AEDT) 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, gromero@linux.ibm.com, Gustavo Luiz Duarte Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Tue, 2020-02-11 at 03:38:30 UTC, Gustavo Luiz Duarte wrote: > This test triggers a TM Bad Thing by raising a signal in transactional state > and forcing a pagefault to happen in kernelspace when the kernel signal > handling code first touches the user signal stack. > > This is inspired by the test tm-signal-context-force-tm but uses userfaultfd to > make the test deterministic. While this test always triggers the bug in one > run, I had to execute tm-signal-context-force-tm several times (the test runs > 5000 times each execution) to trigger the same bug. > > tm-signal-context-force-tm is kept instead of replaced because, while this test > is more reliable and triggers the same bug, tm-signal-context-force-tm has a > better coverage, in the sense that by running the test several times it might > trigger the pagefault and/or be preempted at different places. > > v3: skip test if userfaultfd is unavailable. > > Signed-off-by: Gustavo Luiz Duarte Applied to powerpc next, thanks. https://git.kernel.org/powerpc/c/915b7f6f9a5e232c138bb36743a1fdb0fcf2c432 cheers