linux-kernel - Re: [Patch v2 2/4] mm/page_alloc.c: bad_[reason|flags] is not necessary when PageHWPoison

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Message-ID: <20200120101720.GV18451@dhcp22.suse.cz>
Date:   Mon, 20 Jan 2020 11:17:20 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Wei Yang <richardw.yang@...ux.intel.com>
Cc:     akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, rientjes@...gle.com
Subject: Re: [Patch v2 2/4] mm/page_alloc.c: bad_[reason|flags] is not
 necessary when PageHWPoison

On Mon 20-01-20 11:04:13, Wei Yang wrote:
> Since function returns directly, bad_[reason|flags] is not used any
> where.
> 
> This is a following cleanup for commit e570f56cccd21 ("mm:
> check_new_page_bad() directly returns in __PG_HWPOISON case")
> 
> Signed-off-by: Wei Yang <richardw.yang@...ux.intel.com>
> Acked-by: David Rientjes <rientjes@...gle.com>

This is a left over from loong time ago. AFAICS bad_reason and flags hav
never been used.

Acked-by: Michal Hocko <mhocko@...e.com>

> ---
>  mm/page_alloc.c | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 0cf6218aaba7..a43b9d2482f2 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -2051,8 +2051,6 @@ static void check_new_page_bad(struct page *page)
>  	if (unlikely(page_ref_count(page) != 0))
>  		bad_reason = "nonzero _refcount";
>  	if (unlikely(page->flags & __PG_HWPOISON)) {
> -		bad_reason = "HWPoisoned (hardware-corrupted)";
> -		bad_flags = __PG_HWPOISON;
>  		/* Don't complain about hwpoisoned pages */
>  		page_mapcount_reset(page); /* remove PageBuddy */
>  		return;
> -- 
> 2.17.1

-- 
Michal Hocko
SUSE Labs