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Received: from willy by casper.infradead.org with local (Exim 4.98 #2 (Red Hat Linux)) id 1tspPM-00000004DM9-2cZm; Thu, 13 Mar 2025 20:44:00 +0000 Date: Thu, 13 Mar 2025 20:44:00 +0000 From: Matthew Wilcox To: Dev Jain Cc: jroedel@suse.de, akpm@linux-foundation.org, ryan.roberts@arm.com, david@redhat.com, hch@lst.de, linux-mm@kvack.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: Re: [PATCH] mm: Update mask post pxd_clear_bad() Message-ID: References: <20250313181414.78512-1-dev.jain@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250313181414.78512-1-dev.jain@arm.com> X-Stat-Signature: 3e88p91t4frwwy9e9pp5zf5dss3wz64k X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 53E5B4000E X-Rspam-User: X-HE-Tag: 1741898646-651534 X-HE-Meta: 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 z4ZJxUeQ XardPowMXlIUMXPxepmUpflwhrnQ1AEte1eHAjrChpbUWpzp1HFznv0VcVbelCB8y/YqPapNdnMScCgLodZS5CAJCl/hE0GYQgrR/eljcWKQirpiuc2gjMASusCndHonDug1tO2LM/UNRSzYUBxvCjcVDJonUoRAawAkoax+P9H8b+nVhWTiswhYGNMQn4tkvo+UfSCAV1PAJHWFv/A/v3PdaFbZylh056haqLjWqqSvN9eDGgbiZpVhgpBVdecCethl7n7g8hvSdyJ/YzRX9V0+Qrg== X-Bogosity: Ham, tests=bogofilter, spamicity=0.007411, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Mar 13, 2025 at 11:44:14PM +0530, Dev Jain wrote: > Since pxd_clear_bad() is an operation changing the state of the page tables, > we should call arch_sync_kernel_mappings() post this. Could you explain why? What effect does not calling arch_sync_kernel_mappings() have in this case?