From: Muchun Song <muchun.song@linux.dev>
To: Qi Zheng <zhengqi.arch@bytedance.com>
Cc: david@redhat.com, hughd@google.com, willy@infradead.org,
vbabka@kernel.org, akpm@linux-foundation.org, rppt@kernel.org,
vishal.moola@gmail.com, peterx@redhat.com, ryan.roberts@arm.com,
christophe.leroy2@cs-soprasteria.com,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-arm-kernel@lists.infradead.org,
linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH v5 10/13] mm: page_vma_mapped_walk: map_pte() use pte_offset_map_rw_nolock()
Date: Thu, 26 Sep 2024 15:08:38 +0800 [thread overview]
Message-ID: <2C926DC1-AE51-42CD-8351-62A130D0BC4A@linux.dev> (raw)
In-Reply-To: <2620a48f34c9f19864ab0169cdbf253d31a8fcaa.1727332572.git.zhengqi.arch@bytedance.com>
> On Sep 26, 2024, at 14:46, Qi Zheng <zhengqi.arch@bytedance.com> wrote:
>
> In the caller of map_pte(), we may modify the pvmw->pte after acquiring
> the pvmw->ptl, so convert it to using pte_offset_map_rw_nolock(). At
> this time, the pte_same() check is not performed after the pvmw->ptl held,
> so we should get pmdval and do pmd_same() check to ensure the stability of
> pvmw->pmd.
>
> Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com>
Reviewed-by: Muchun Song <muchun.song@linux.dev>
Thanks.
next prev parent reply other threads:[~2024-09-26 7:09 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-09-26 6:46 [PATCH v5 00/13] introduce pte_offset_map_{ro|rw}_nolock() Qi Zheng
2024-09-26 6:46 ` [PATCH v5 01/13] mm: pgtable: " Qi Zheng
2024-09-26 6:46 ` [PATCH v5 02/13] powerpc: assert_pte_locked() use pte_offset_map_ro_nolock() Qi Zheng
2024-09-26 6:46 ` [PATCH v5 03/13] mm: filemap: filemap_fault_recheck_pte_none() " Qi Zheng
2024-09-26 6:46 ` [PATCH v5 04/13] mm: khugepaged: __collapse_huge_page_swapin() " Qi Zheng
2024-09-26 6:46 ` [PATCH v5 05/13] arm: adjust_pte() use pte_offset_map_rw_nolock() Qi Zheng
2024-09-26 6:46 ` [PATCH v5 06/13] mm: handle_pte_fault() " Qi Zheng
2024-09-26 6:46 ` [PATCH v5 07/13] mm: khugepaged: collapse_pte_mapped_thp() " Qi Zheng
2024-09-26 7:07 ` Muchun Song
2024-09-26 6:46 ` [PATCH v5 08/13] mm: copy_pte_range() " Qi Zheng
2024-09-26 6:46 ` [PATCH v5 09/13] mm: mremap: move_ptes() " Qi Zheng
2024-09-26 6:46 ` [PATCH v5 10/13] mm: page_vma_mapped_walk: map_pte() " Qi Zheng
2024-09-26 7:08 ` Muchun Song [this message]
2024-09-26 6:46 ` [PATCH v5 11/13] mm: userfaultfd: move_pages_pte() " Qi Zheng
2024-09-26 6:46 ` [PATCH v5 12/13] mm: multi-gen LRU: walk_pte_range() " Qi Zheng
2024-09-26 6:46 ` [PATCH v5 13/13] mm: pgtable: remove pte_offset_map_nolock() Qi Zheng
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