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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?Tl4A7wJneCaa4i0pkAyAA72UG0+OEGzvuvwm7SCqnucodfDKxvb2dZtkehKg?= =?us-ascii?Q?rfG9FetBUZtIy1iq9CtkK8TpSTbS9YgonJIcAEQzi5WK56K62thkYhPCc0gX?= =?us-ascii?Q?6FJw3ScThBxBXi1o1tOe+GCoIXLOflvfw8ToKWwj9QTGpFf7qwjRRwj5Z2kF?= =?us-ascii?Q?ysZutmYp2GavjPmkAG0R+yl4KwPMdRTBIRDfMzAwZjtqEYyXxQy58nizg3oC?= =?us-ascii?Q?ng0SyUQNFuFgbtWXRVyH+OLT4EyP5OYCmRDe3hEBmjfGm7N7EZ6L6TBtbWwA?= =?us-ascii?Q?OEB19/BnpyhX4cB9KcS/izYbavohOXnesdHazj5polC7s5sT+GCPpQANy17C?= =?us-ascii?Q?70vulZy2qgwGcWIimTa1r7U+D6bwtHItMxcXtCAN0ged0q/GQH5n65K5zyfG?= =?us-ascii?Q?/NLvB6MCeKujg0R6opF2UvwRfzS6bzqQdxWpHT3K6etb4ei5UKuGukZESWRV?= =?us-ascii?Q?++ac6kA0umy7nAJH78z+h3O0KYdz7XffUliDuUYukGZzXDvLKiCSi0l/cl6+?= =?us-ascii?Q?2aT3txhxtU7sn1JBAeOUIidF+Rkb9n+cKbtAZSzG3Z1N81axUE8tzBjO4FzU?= =?us-ascii?Q?IM5MtJN4yKCu8qXRTeWGx7sH7VKFWNLexfk45kPORLf3qbbydna63FaR9FSj?= =?us-ascii?Q?oRMVfAusgVeXcFgVGVQdwhBW6kGvkPbFYg7LjP9YWfu9aEhJDTAw5FFhtvZ4?= =?us-ascii?Q?A+qKFbKQ7haBy3X7XZ4rkd+++lyiuKZuQ82CIELpY+dx7lFoqOxgHlvoVvv7?= =?us-ascii?Q?cB4F9ERTnA59qPeyt/gEsXzGtut6+qg4jLTwYbD2+HxJyl6g2xjtCvJ9rkCN?= =?us-ascii?Q?fmwjhBS5wJtG4/T99DO6HHln1K/45tv5MLX90kmJpNHO6/Tywh5Gc/gWlKNI?= =?us-ascii?Q?z6qzxM8+zo1m0vtChm5UakqoowempNSOe//w4MeDmNU/yy5kvt9nLC90yalE?= =?us-ascii?Q?wzkTrjWhRDPsst5APCWZmBpHTG+t7aRCGVxUyrhvwVzMxu4gLRhl+0s283Pw?= =?us-ascii?Q?6vs/ZzQoSmJDoBCrbVMtwhnRDrSEisHFypqpuEVZSVzUwNTi3JexY81D9PUl?= =?us-ascii?Q?3IizYE1083evc9fivyLzZwo71Ysgo2ACztur8wXFrfv4sJDf3WEkS7xsCg1B?= =?us-ascii?Q?W3FVNJOSIfw9+iSmpKnuYx+BGwreYY8gB0/OPNmo7DmhOYonHMGR7/+bsEWo?= =?us-ascii?Q?CKHshVw9FeEwRI4MfrKfvSgjwSUTGOMrkHydJH1LgOFDyrZaE7dFa6sLVfQw?= =?us-ascii?Q?vuuKn4lKgxsZyOE4GmlbGEwEFFCFrZm3V0CVommIGC3zyYEroV1156QZg+xM?= =?us-ascii?Q?arsrWovLAI/zhYwUmfvGsSpAszDIOBLWoBv5B/huPV7FViZICHvOwXg4wJT9?= =?us-ascii?Q?Nur+duMaXwyKiQlAZ+8Miv0fYavh22zQEll1i3qdeCFGsFNtE/nNpR1rR6eN?= =?us-ascii?Q?6HIheVAPU92GDmER2gVeLlHXoN0pt4HAqxE0mU4NXP6LNtSkQ9QhlgXzMpUT?= =?us-ascii?Q?vLQi2Av0oXZIefkSQuqrdD8xvXQgWgmZ8AnpHrzNDiGW4QJXlLBje31a1hxu?= =?us-ascii?Q?8OiDzirVSIUqjOHYU0Pm662N4Tk98j6LHYlZ7aQy?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 296ad4dd-298e-4f03-37cd-08db5bf8dd9c X-MS-Exchange-CrossTenant-AuthSource: MN2PR12MB3181.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 May 2023 01:47:43.3322 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: o8nzlMl1N86IZpbrrpOE23VRaBtxSTgVMaTXhzqKgky2yc/PjvPLZPmIznMHUzOSmTQ3/JiAcmcxMvDwkw90uQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY8PR12MB7492 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The .invalidate_range() callback is called by mmu_notifier_invalidate_range() which is often called while holding the ptl spin-lock. Therefore any implementations of this callback must not sleep. This was originally documented when the call back was added in commit 0f0a327fa12c ("mmu_notifier: add the callback for mmu_notifier_invalidate_range()") but appears to have been inadvertently removed by commit 5ff7091f5a2c ("mm, mmu_notifier: annotate mmu notifiers with blockable invalidate callbacks"). Restore the comment to make it clear that .invalidate_range() callbacks may not sleep. Signed-off-by: Alistair Popple --- include/linux/mmu_notifier.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h index 64a3e05..447d757 100644 --- a/include/linux/mmu_notifier.h +++ b/include/linux/mmu_notifier.h @@ -200,6 +200,9 @@ struct mmu_notifier_ops { * external TLB range needs to be flushed. For more in depth * discussion on this see Documentation/mm/mmu_notifier.rst * + * The invalidate_range() function is called under the ptl + * spin-lock and not allowed to sleep. + * * Note that this function might be called with just a sub-range * of what was passed to invalidate_range_start()/end(), if * called between those functions. base-commit: 44c026a73be8038f03dbdeef028b642880cf1511 -- git-series 0.9.1 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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 37464C77B7E for ; Wed, 24 May 2023 01:48:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-Id:Date:Subject:Cc :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The .invalidate_range() callback is called by mmu_notifier_invalidate_range() which is often called while holding the ptl spin-lock. Therefore any implementations of this callback must not sleep. This was originally documented when the call back was added in commit 0f0a327fa12c ("mmu_notifier: add the callback for mmu_notifier_invalidate_range()") but appears to have been inadvertently removed by commit 5ff7091f5a2c ("mm, mmu_notifier: annotate mmu notifiers with blockable invalidate callbacks"). Restore the comment to make it clear that .invalidate_range() callbacks may not sleep. Signed-off-by: Alistair Popple --- include/linux/mmu_notifier.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h index 64a3e05..447d757 100644 --- a/include/linux/mmu_notifier.h +++ b/include/linux/mmu_notifier.h @@ -200,6 +200,9 @@ struct mmu_notifier_ops { * external TLB range needs to be flushed. For more in depth * discussion on this see Documentation/mm/mmu_notifier.rst * + * The invalidate_range() function is called under the ptl + * spin-lock and not allowed to sleep. + * * Note that this function might be called with just a sub-range * of what was passed to invalidate_range_start()/end(), if * called between those functions. base-commit: 44c026a73be8038f03dbdeef028b642880cf1511 -- git-series 0.9.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel