can't find file to patch at input line 111 Perhaps you used the wrong -p or --strip option? The text leading up to this was: -------------------------- |From patchwork Wed Jul 14 23:04:26 2021 |Content-Type: text/plain; charset="utf-8" |MIME-Version: 1.0 |Content-Transfer-Encoding: 7bit |X-Patchwork-Submitter: Vineet Gupta |X-Patchwork-Id: 44344 |Return-Path: |X-Original-To: patchwork@sourceware.org |Delivered-To: patchwork@sourceware.org |Received: from server2.sourceware.org (localhost [IPv6:::1]) | by sourceware.org (Postfix) with ESMTP id A1C61398CC24 | for ; Wed, 14 Jul 2021 23:04:56 +0000 (GMT) |DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org A1C61398CC24 |DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; | s=default; t=1626303896; | bh=r8EQTXupnuGz1xvanXLg9BByZrLzNr0/G8hgndos3p0=; | h=To:Subject:Date:List-Id:List-Unsubscribe:List-Archive:List-Post: | List-Help:List-Subscribe:From:Reply-To:Cc:From; | b=DhcHcoifT30yFPymt50rF2p74CtkRpnNZh+XzOHb75VGbwhzK0Zt4E8fYFWIIZ61N | aOMg6t2YBTILSxwMFyPkWMTMvJ6MfhoLhePAjwzVDBhBUB5roVmKzrlvLMEYccInB/ | k5UwmxbSQwUJtrM9M7aJQOO7gDoHP3u6+2UoPyGY= |X-Original-To: libc-alpha@sourceware.org |Delivered-To: libc-alpha@sourceware.org |Received: from smtprelay-out1.synopsys.com (smtprelay-out1.synopsys.com | [149.117.87.133]) | by sourceware.org (Postfix) with ESMTPS id BA5123857821 | for ; Wed, 14 Jul 2021 23:04:34 +0000 (GMT) |DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org BA5123857821 |Received: from mailhost.synopsys.com (sv1-mailhost2.synopsys.com | [10.205.2.132]) | (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) | (Client CN "mailhost.synopsys.com", Issuer "SNPSica2" (verified OK)) | by smtprelay-out1.synopsys.com (Postfix) with ESMTPS id B01EEC0BBE; | Wed, 14 Jul 2021 23:04:32 +0000 (UTC) |Received: from vineetg-Latitude-7400.internal.synopsys.com | (snps-fugpbdpduq.internal.synopsys.com [10.202.17.37]) | (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) | (Client did not present a certificate) | by mailhost.synopsys.com (Postfix) with ESMTPSA id 42A88A0251; | Wed, 14 Jul 2021 23:04:30 +0000 (UTC) |X-SNPS-Relay: synopsys.com |To: linux-kernel@vger.kernel.org |Subject: [PATCH] ARC: fp: set FPU_STATUS.FWE to enable FPU_STATUS update on | context switch |Date: Wed, 14 Jul 2021 16:04:26 -0700 |Message-Id: <20210714230426.7141-1-vgupta@synopsys.com> |X-Mailer: git-send-email 2.25.1 |MIME-Version: 1.0 |X-Spam-Status: No, score=-11.2 required=5.0 tests=BAYES_00, DKIM_SIGNED, | DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, RCVD_IN_MSPIKE_H4, | RCVD_IN_MSPIKE_WL, SPF_HELO_NONE, SPF_NONE, | TXREP autolearn=ham autolearn_force=no version=3.4.4 |X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on | server2.sourceware.org |X-BeenThere: libc-alpha@sourceware.org |X-Mailman-Version: 2.1.29 |Precedence: list |List-Id: Libc-alpha mailing list |List-Unsubscribe: , | |List-Archive: |List-Post: |List-Help: |List-Subscribe: , | |X-Patchwork-Original-From: Vineet Gupta via Libc-alpha | |From: Vineet Gupta |Reply-To: Vineet Gupta |Cc: Vineet Gupta , | linux-snps-arc@lists.infradead.org, libc-alpha@sourceware.org, | stable@vger.kernel.org |Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org |Sender: "Libc-alpha" | | |FPU_STATUS register contains FP exception flags bits which are updated |as side-effect of FP instructions but can also be manually wiggled such |as by glibc C99 functions fe{raise,clear,test}except() etc. |To effect the update, the programming model requires OR'ing FWE |bit(231). This bit is write-only and RAZ, meaning it is effectively |auto-cleared after a write and thus needs to be set everytime which |is how glibc implements this. | |However there's another usecase of FPU_STATUS update, at the time of |Linux task switch when incoming task value needs to be programmed into |the register. This was added as part of f45ba2bd6da0dc ("ARCv2: |fpu: preserve userspace fpu state") which however missing the OR'ing |with FWE bit, meaning the new value is not effectively being written at |all, which is what this patch fixes. This was not caught in interm glibc |testing as the race window which relies on a specific exception bit to be |set/clear is really small and will end up causing extremely hard to |reproduce/debug issues. | |Fortunately this was caught by glibc's math/test-fenv-tls test which |repeatedly set/clear exception flags in a big loop, concurrently in main |program and also in a thread. | |Fixes: https://github.com/foss-for-synopsys-dwc-arc-processors/linux/issues/54 |Fixes: f45ba2bd6da0dc ("ARCv2: fpu: preserve userspace fpu state") |Cc: stable@vger.kernel.org #5.6+ |Signed-off-by: Vineet Gupta |--- | arch/arc/kernel/fpu.c | 9 ++++++--- | 1 file changed, 6 insertions(+), 3 deletions(-) | |diff --git a/arch/arc/kernel/fpu.c b/arch/arc/kernel/fpu.c |index c67c0f0f5f77..ec640219d989 100644 |--- a/arch/arc/kernel/fpu.c |+++ b/arch/arc/kernel/fpu.c -------------------------- File to patch: Skip this patch? [y] Skipping patch. 1 out of 1 hunk ignored