Re: [PATCH] mm: pagewalk: fix unused variable warning

[John Hubbard]

On 1/7/20 12:45 PM, Arnd Bergmann wrote:
> One of the pagewalk patches introduced a harmless warning:
> 
> mm/hmm.c: In function 'hmm_vma_walk_pud':
> mm/hmm.c:478:9: error: unused variable 'pmdp' [-Werror=unused-variable]
>   pmd_t *pmdp;
>          ^~~~
> mm/hmm.c:477:30: error: unused variable 'next' [-Werror=unused-variable]
>   unsigned long addr = start, next;
>                               ^~~~
> 
> Remove both of the now-unused variables.
> 
> Fixes: cb4d03d5fb4c ("mm: pagewalk: add p4d_entry() and pgd_entry()")
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> ---
>  mm/hmm.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 

Reviewed-by: John Hubbard <jhubbard@xxxxxxxxxx>


thanks,
-- 
John Hubbard
NVIDIA

> diff --git a/mm/hmm.c b/mm/hmm.c
> index a71295e99968..72e5a6d9a417 100644
> --- a/mm/hmm.c
> +++ b/mm/hmm.c
> @@ -474,8 +474,7 @@ static int hmm_vma_walk_pud(pud_t *pudp, unsigned long start, unsigned long end,
>  {
>  	struct hmm_vma_walk *hmm_vma_walk = walk->private;
>  	struct hmm_range *range = hmm_vma_walk->range;
> -	unsigned long addr = start, next;
> -	pmd_t *pmdp;
> +	unsigned long addr = start;
>  	pud_t pud;
>  	int ret = 0;
>  	spinlock_t *ptl = pud_trans_huge_lock(pudp, walk->vma);
>