Re: [PATCH v2 08/14] mm: copy_pte_range() use pte_offset_map_rw_nolock()

From: Muchun Song
Date: Thu Aug 29 2024 - 04:14:32 EST




> On Aug 22, 2024, at 15:13, Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx> 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@xxxxxxxxxxxxx>

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