Re: [PATCH v9 06/15] kpageflags: Use is_page_hwpoison() to set KPF_HWPOISON

["David Hildenbrand (Arm)" <david@kernel.org>]

On 8/5/26 23:05, Matthew Wilcox (Oracle) wrote:
> Instead of knowing how hugetlb handles hwpoison, just ask
> is_page_hwpoison().  This gives us the flexibility to change how hwpoison
> is handled without updating this function in the future.
> 
> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
> Reviewed-by: Jane Chu <jane.chu@oracle.com>
> Reviewed-by: Gregory Price (Meta) <gourry@gourry.net>
> ---
>  fs/proc/page.c | 8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)
> 
> diff --git a/fs/proc/page.c b/fs/proc/page.c
> index 7d9387143435..323e4c049f69 100644
> --- a/fs/proc/page.c
> +++ b/fs/proc/page.c
> @@ -233,12 +233,8 @@ u64 stable_page_flags(const struct page *page)
>  	u |= kpf_copy_bit(k, KPF_UNEVICTABLE,	PG_unevictable);
>  	u |= kpf_copy_bit(k, KPF_MLOCKED,	PG_mlocked);
>  
> -#ifdef CONFIG_MEMORY_FAILURE
> -	if (u & (1 << KPF_HUGE))
> -		u |= kpf_copy_bit(k, KPF_HWPOISON,	PG_hwpoison);
> -	else
> -		u |= kpf_copy_bit(ps.page_snapshot.flags.f, KPF_HWPOISON, PG_hwpoison);
> -#endif
> +	if (is_page_hwpoison(page))
> +		u |= 1 << KPF_HWPOISON;

snapshot_page() takes a snapshot of the folio and the page. If you look at
"page", you start going to the live version again.

-- 
Cheers,

David