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Message-Id: <A619C874-E6B9-4D07-82B9-ABBCDB39DFC2@linux.dev>
Date: Thu, 29 Aug 2024 16:13:44 +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 v2 08/14] mm: copy_pte_range() use
pte_offset_map_rw_nolock()
> On Aug 22, 2024, at 15:13, Qi Zheng <zhengqi.arch@...edance.com> wrote:
>
> In copy_pte_range(), we may modify the src_pte entry after holding the
> src_ptl, so convert it to using pte_offset_map_rw_nolock(). But since we
> already hold the write lock of mmap_lock, 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>
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