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Tue, 29 Sep 2020 14:43:21 +0000 Subject: Re: [PATCH] rcu,ftrace: Fix ftrace recursion To: Peter Zijlstra , Paul McKenney Cc: linux-kernel@vger.kernel.org, Steven Rostedt , Thomas Gleixner , Ingo Molnar References: <20200929113340.GN2628@hirez.programming.kicks-ass.net> From: Kim Phillips Message-ID: <459f3c42-4e18-0a71-fd84-122342bdb4fe@amd.com> Date: Tue, 29 Sep 2020 09:43:18 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 In-Reply-To: <20200929113340.GN2628@hirez.programming.kicks-ass.net> Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [165.204.77.11] X-ClientProxiedBy: SN2PR01CA0068.prod.exchangelabs.com (2603:10b6:800::36) To BN8PR12MB2946.namprd12.prod.outlook.com (2603:10b6:408:9d::13) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [10.252.17.193] (165.204.77.11) by SN2PR01CA0068.prod.exchangelabs.com (2603:10b6:800::36) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3412.20 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData: 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 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: f8eaef3e-ffd8-4f11-aeea-08d864860331 X-MS-Exchange-CrossTenant-AuthSource: BN8PR12MB2946.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 Sep 2020 14:43:21.7896 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: emj2L25QtfY2Q+xd4e0L3tqgl1lti8IdsDXMp3bqkTvc06N1tL+c78fdAgC6KmdoF3jqoGKKSoU92zLEOqRXlw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN6PR12MB1570 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 9/29/20 6:33 AM, Peter Zijlstra wrote: > > Kim reported that perf-ftrace made his box unhappy. It turns out that > commit: > > ff5c4f5cad33 ("rcu/tree: Mark the idle relevant functions noinstr") > > removed one too many notrace. Probably due to there not being a helpful > comment. > > Reinstate the notrace and add a comment to avoid loosing it again. > > Fixes: ff5c4f5cad33 ("rcu/tree: Mark the idle relevant functions noinstr") > Reported-by: Kim Phillips > Signed-off-by: Peter Zijlstra (Intel) > --- Tested-by: Kim Phillips Thanks, Kim