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

[Muchun Song]

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

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