linux-kernel - Re: [PATCH] mm: Update mask post pxd_clear

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Message-ID: <Z9NDkFzSj-vnvGOy@casper.infradead.org>
Date: Thu, 13 Mar 2025 20:44:00 +0000
From: Matthew Wilcox <willy@...radead.org>
To: Dev Jain <dev.jain@....com>
Cc: jroedel@...e.de, akpm@...ux-foundation.org, ryan.roberts@....com,
	david@...hat.com, hch@....de, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] mm: Update mask post pxd_clear_bad()

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?