linux-kernel - Re: [PATCH 11/14] mm/hmm: move hmm_pfns

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Date:   Mon, 19 Mar 2018 16:12:10 -0700
From:   John Hubbard <jhubbard@...dia.com>
To:     <jglisse@...hat.com>, <linux-mm@...ck.org>
CC:     Andrew Morton <akpm@...ux-foundation.org>,
        <linux-kernel@...r.kernel.org>,
        Evgeny Baskakov <ebaskakov@...dia.com>,
        Ralph Campbell <rcampbell@...dia.com>,
        Mark Hairgrove <mhairgrove@...dia.com>
Subject: Re: [PATCH 11/14] mm/hmm: move hmm_pfns_clear() closer to where it is
 use

On 03/16/2018 01:35 PM, jglisse@...hat.com wrote:
> From: Jérôme Glisse <jglisse@...hat.com>
> 
> Move hmm_pfns_clear() closer to where it is use to make it clear it
> is not use by page table walkers.
> 
> Signed-off-by: Jérôme Glisse <jglisse@...hat.com>
> Cc: Evgeny Baskakov <ebaskakov@...dia.com>
> Cc: Ralph Campbell <rcampbell@...dia.com>
> Cc: Mark Hairgrove <mhairgrove@...dia.com>
> Cc: John Hubbard <jhubbard@...dia.com>
> ---
>  mm/hmm.c | 16 ++++++++--------
>  1 file changed, 8 insertions(+), 8 deletions(-)

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

> 
> diff --git a/mm/hmm.c b/mm/hmm.c
> index 857eec622c98..3a708f500b80 100644
> --- a/mm/hmm.c
> +++ b/mm/hmm.c
> @@ -297,14 +297,6 @@ static int hmm_pfns_bad(unsigned long addr,
>  	return 0;
>  }
>  
> -static void hmm_pfns_clear(uint64_t *pfns,
> -			   unsigned long addr,
> -			   unsigned long end)
> -{
> -	for (; addr < end; addr += PAGE_SIZE, pfns++)
> -		*pfns = 0;
> -}
> -
>  /*
>   * hmm_vma_walk_hole() - handle a range back by no pmd or no pte
>   * @start: range virtual start address (inclusive)
> @@ -463,6 +455,14 @@ static int hmm_vma_walk_pmd(pmd_t *pmdp,
>  	return 0;
>  }
>  
> +static void hmm_pfns_clear(uint64_t *pfns,
> +			   unsigned long addr,
> +			   unsigned long end)
> +{
> +	for (; addr < end; addr += PAGE_SIZE, pfns++)
> +		*pfns = 0;
> +}
> +

Yep, identical, so no functional changes.

>  static void hmm_pfns_special(struct hmm_range *range)
>  {
>  	unsigned long addr = range->start, i = 0;

thanks,
-- 
John Hubbard
NVIDIA