linux-kernel - Re: [PATCH v3 11/14] mm: userfaultfd: move_pages_pte() use pte_offset_map_rw

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Message-Id: <7FEBE447-2635-4BA9-83F1-89A3F0CB3BD6@linux.dev>
Date: Thu, 5 Sep 2024 20:20:30 +0800
From: Muchun Song <muchun.song@...ux.dev>
To: Qi Zheng <zhengqi.arch@...edance.com>
Cc: David Hildenbrand <david@...hat.com>,
 Hugh Dickins <hughd@...gle.com>,
 Matthew Wilcox <willy@...radead.org>,
 "Vlastimil Babka (SUSE)" <vbabka@...nel.org>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Mike Rapoport <rppt@...nel.org>,
 Vishal Moola <vishal.moola@...il.com>,
 Peter Xu <peterx@...hat.com>,
 Ryan Roberts <ryan.roberts@....com>,
 christophe.leroy2@...soprasteria.com,
 LKML <linux-kernel@...r.kernel.org>,
 Linux Memory Management List <linux-mm@...ck.org>,
 linux-arm-kernel@...ts.infradead.org,
 linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v3 11/14] mm: userfaultfd: move_pages_pte() use
 pte_offset_map_rw_nolock()



> On Sep 4, 2024, at 16:40, Qi Zheng <zhengqi.arch@...edance.com> wrote:
> 
> In move_pages_pte(), we may modify the dst_pte and src_pte after acquiring
> the ptl, so convert it to using pte_offset_map_rw_nolock(). But since we
> already do the pte_same() check, there is no need to get pmdval to do
> pmd_same() check, just pass a dummy variable to it.
> 
> Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>

Reviewed-by: Muchun Song <muchun.song@...ux.dev>

Thanks.