linux-kernel - Re: [PATCH 15/16] mm/page_alloc: remove obsolete gfpflags_normal

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Date:   Thu, 15 Sep 2022 09:48:04 +0200
From:   Oscar Salvador <osalvador@...e.de>
To:     Miaohe Lin <linmiaohe@...wei.com>
Cc:     akpm@...ux-foundation.org, david@...hat.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 15/16] mm/page_alloc: remove obsolete
 gfpflags_normal_context()

On Fri, Sep 09, 2022 at 05:24:50PM +0800, Miaohe Lin wrote:
> Since commit dacb5d8875cc ("tcp: fix page frag corruption on page
> fault"), there's no caller of gfpflags_normal_context(). Remove it
> as this helper is strictly tied to the sk page frag usage and there
> won't be other user in the future.
> 
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>

Reviewed-by: Oscar Salvador <osalvador@...e.de>

> ---
>  include/linux/gfp.h | 23 -----------------------
>  1 file changed, 23 deletions(-)
> 
> diff --git a/include/linux/gfp.h b/include/linux/gfp.h
> index ea6cb9399152..ef4aea3b356e 100644
> --- a/include/linux/gfp.h
> +++ b/include/linux/gfp.h
> @@ -36,29 +36,6 @@ static inline bool gfpflags_allow_blocking(const gfp_t gfp_flags)
>  	return !!(gfp_flags & __GFP_DIRECT_RECLAIM);
>  }
>  
> -/**
> - * gfpflags_normal_context - is gfp_flags a normal sleepable context?
> - * @gfp_flags: gfp_flags to test
> - *
> - * Test whether @gfp_flags indicates that the allocation is from the
> - * %current context and allowed to sleep.
> - *
> - * An allocation being allowed to block doesn't mean it owns the %current
> - * context.  When direct reclaim path tries to allocate memory, the
> - * allocation context is nested inside whatever %current was doing at the
> - * time of the original allocation.  The nested allocation may be allowed
> - * to block but modifying anything %current owns can corrupt the outer
> - * context's expectations.
> - *
> - * %true result from this function indicates that the allocation context
> - * can sleep and use anything that's associated with %current.
> - */
> -static inline bool gfpflags_normal_context(const gfp_t gfp_flags)
> -{
> -	return (gfp_flags & (__GFP_DIRECT_RECLAIM | __GFP_MEMALLOC)) ==
> -		__GFP_DIRECT_RECLAIM;
> -}
> -
>  #ifdef CONFIG_HIGHMEM
>  #define OPT_ZONE_HIGHMEM ZONE_HIGHMEM
>  #else
> -- 
> 2.23.0
> 

-- 
Oscar Salvador
SUSE Labs