[PATCH v3 11/14] mm: userfaultfd: move_pages_pte() use pte_offset_map_rw_nolock()

[Muchun Song]

> On Sep 4, 2024, at 16:40, Qi Zheng <zhengqi.arch at bytedance.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 at bytedance.com>

Reviewed-by: Muchun Song <muchun.song at linux.dev>

Thanks.