linux-kernel - Re: [PATCH 3/6] mm/gup: make __gup_longterm

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Date:   Thu, 3 Dec 2020 00:03:10 -0800
From:   John Hubbard <jhubbard@...dia.com>
To:     Pavel Tatashin <pasha.tatashin@...een.com>,
        <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
        <akpm@...ux-foundation.org>, <vbabka@...e.cz>, <mhocko@...e.com>,
        <david@...hat.com>, <osalvador@...e.de>,
        <dan.j.williams@...el.com>, <sashal@...nel.org>,
        <tyhicks@...ux.microsoft.com>, <iamjoonsoo.kim@....com>,
        <mike.kravetz@...cle.com>, <rostedt@...dmis.org>,
        <mingo@...hat.com>, <jgg@...pe.ca>, <peterz@...radead.org>,
        <mgorman@...e.de>, <willy@...radead.org>, <rientjes@...gle.com>
Subject: Re: [PATCH 3/6] mm/gup: make __gup_longterm_locked common

On 12/1/20 9:23 PM, Pavel Tatashin wrote:
> __gup_longterm_locked() has CMA || FS_DAX version and a common stub
> version. In the preparation of prohibiting longterm pinning of pages from
> movable zone make the CMA || FS_DAX version common, and delete the stub
> version.
> 
> Signed-off-by: Pavel Tatashin <pasha.tatashin@...een.com>
> ---
>   mm/gup.c | 13 -------------
>   1 file changed, 13 deletions(-)
> 
> diff --git a/mm/gup.c b/mm/gup.c
> index 3a76c005a3e2..0e2de888a8b0 100644
> --- a/mm/gup.c
> +++ b/mm/gup.c
> @@ -1567,7 +1567,6 @@ struct page *get_dump_page(unsigned long addr)
>   }
>   #endif /* CONFIG_ELF_CORE */
>   
> -#if defined(CONFIG_FS_DAX) || defined (CONFIG_CMA)
>   #ifdef CONFIG_FS_DAX
>   static bool check_dax_vmas(struct vm_area_struct **vmas, long nr_pages)
>   {
> @@ -1757,18 +1756,6 @@ static long __gup_longterm_locked(struct mm_struct *mm,
>   		kfree(vmas_tmp);
>   	return rc;
>   }
> -#else /* !CONFIG_FS_DAX && !CONFIG_CMA */
> -static __always_inline long __gup_longterm_locked(struct mm_struct *mm,
> -						  unsigned long start,
> -						  unsigned long nr_pages,
> -						  struct page **pages,
> -						  struct vm_area_struct **vmas,
> -						  unsigned int flags)
> -{
> -	return __get_user_pages_locked(mm, start, nr_pages, pages, vmas,
> -				       NULL, flags);
> -}
> -#endif /* CONFIG_FS_DAX || CONFIG_CMA */
>   
>   static bool is_valid_gup_flags(unsigned int gup_flags)
>   {
> 

At last some simplification here, yea!

Reviewed-by: John Hubbard <jhubbard@...dia.com>

thanks,
-- 
John Hubbard
NVIDIA