Re: [RFC PATCH 11/34] mm: vmscan: remove stack copy address of pud pass in wallk_pud_range()

[Usama Anjum <usama.anjum@arm.com>]

On 13/07/2026 2:55 pm, Yeoreum Yun wrote:
> We want to change how pXdp_get() works with generic compile-time folded
> page tables. To prepare for that, replace passing the address of a stack
> copy of a pXd to walk_pmd_range() with pud pointer directly so that
> the ignoring the value of folded entries.
> 
> There should be no functional change.
> 
> Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
> ---
>  mm/vmscan.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 986dde8e7429f..61470223d8213 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -3725,7 +3725,7 @@ static int walk_pud_range(p4d_t *p4d, unsigned long start, unsigned long end,
>  		if (!pud_present(val) || WARN_ON_ONCE(pud_leaf(val)))
>  			continue;
>  
> -		walk_pmd_range(&val, addr, next, args);
> +		walk_pmd_range(pud + i, addr, next, args);
While I was working on converting these page table types to hardware types, I
had this exact patch for this problem.

Reviewed-by: Muhammad Usama Anjum <usama.anjum@arm.com>

>  
>  		if (need_resched() || walk->batched >= MAX_LRU_BATCH) {
>  			end = (addr | ~PUD_MASK) + 1;