Re: [PATCH v2 01/13] mm/memory-failure: simplify put_ref_page()

[Kefeng Wang <wangkefeng.wang@huawei.com>]

On 2024/6/6 14:32, Miaohe Lin wrote:
> Remove unneeded page != NULL check. pfn_to_page() won't return NULL.
> No functional change intended.
> 
> Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
> ---
>   mm/memory-failure.c | 6 +-----
>   1 file changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/mm/memory-failure.c b/mm/memory-failure.c
> index f679b579d45d..2e6038c73119 100644
> --- a/mm/memory-failure.c
> +++ b/mm/memory-failure.c
> @@ -2120,14 +2120,10 @@ static inline unsigned long folio_free_raw_hwp(struct folio *folio, bool flag)
>   /* Drop the extra refcount in case we come from madvise() */
>   static void put_ref_page(unsigned long pfn, int flags)

Since all calllers have a valid page，better to pass the page instead of 
pfn?

>   {
> -	struct page *page;
> -
>   	if (!(flags & MF_COUNT_INCREASED))
>   		return;
>   
> -	page = pfn_to_page(pfn);
> -	if (page)
> -		put_page(page);
> +	put_page(pfn_to_page(pfn));
>   }
>   
>   static int memory_failure_dev_pagemap(unsigned long pfn, int flags,