Re: [PATCH v5 10/13] mm: page_vma_mapped_walk: map_pte() use pte_offset_map_rw_nolock()

[Muchun Song]

> On Sep 26, 2024, at 14:46, Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx> 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@xxxxxxxxxxxxx>

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

Thanks.