linux-kernel - Re: [PATCH v4 1/2] mm/uffd: UFFD_FEATURE_WP

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Date:   Fri, 24 Mar 2023 11:21:22 -0400
From:   Peter Xu <peterx@...hat.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     Nadav Amit <nadav.amit@...il.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Paul Gofman <pgofman@...eweavers.com>,
        Muhammad Usama Anjum <usama.anjum@...labora.com>,
        David Hildenbrand <david@...hat.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v4 1/2] mm/uffd: UFFD_FEATURE_WP_UNPOPULATED

On Thu, Mar 09, 2023 at 05:37:10PM -0500, Peter Xu wrote:
> This is a new feature that controls how uffd-wp handles none ptes.  When
> it's set, the kernel will handle anonymous memory the same way as file
> memory, by allowing the user to wr-protect unpopulated ptes.

[...]

Hi, Andrew,

Could you add a fixup to this patch as attached?  It contains two comment
changes suggested by David, and also a oneliner fix to khugepaged (to bail
out anon thp collapsing when seeing pte markers).  The latter one was
something I spot only later on.

Thanks,

-- 
Peter Xu

View attachment "0001-fixup-mm-uffd-UFFD_FEATURE_WP_UNPOPULATED.patch" of type "text/plain" (2293 bytes)