Re: [PATCH] mm: use proper PTE accessor in move_ptes()

[Alexander Gordeev <agordeev@linux.ibm.com>]

On Thu, Jul 30, 2026 at 03:08:04PM +0200, David Hildenbrand (Arm) wrote:
> On 7/30/26 15:07, David Hildenbrand (Arm) wrote:
> > On 7/20/26 16:16, Alexander Gordeev wrote:
> >> Follow the pattern established by commit c33c794828f2
> >> ("mm: ptep_get() conversion") and use the proper PTE
> >> accessor instead of a direct pointer dereference.
> >>
> >> Fixes: b36b701bbcd9 ("mm: expose abnormal new_pte during move_ptes")
> >> Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
> >> ---
> >>  mm/mremap.c | 2 +-
> >>  1 file changed, 1 insertion(+), 1 deletion(-)
> >>
> >> diff --git a/mm/mremap.c b/mm/mremap.c
> >> index 0dfe3de39ccc..e99b19a9850b 100644
> >> --- a/mm/mremap.c
> >> +++ b/mm/mremap.c
> >> @@ -264,7 +264,7 @@ static int move_ptes(struct pagetable_move_control *pmc,
> >>  
> >>  	for (; old_addr < old_end; old_ptep += nr_ptes, old_addr += nr_ptes * PAGE_SIZE,
> >>  		new_ptep += nr_ptes, new_addr += nr_ptes * PAGE_SIZE) {
> >> -		VM_WARN_ON_ONCE(!pte_none(*new_ptep));
> >> +		VM_WARN_ON_ONCE(!pte_none(ptep_get(new_ptep)));
> >>  
> >>  		nr_ptes = 1;
> >>  		max_nr_ptes = (old_end - old_addr) >> PAGE_SHIFT;
> > 
> > Acked-by: David Hildenbrand (Arm) <david@kernel.org>
> > 
> 
> Ah, but I think we should drop the Fixes: tag, or am I missing something?

No, you do not. I confused it with ptep_get_lockless(), so no bugfix
here. Should I send v2?

> -- 
> Cheers,
> 
> David

Thanks!