linux-kernel - Re: [PATCHv4 1/3] mm/gup: rename nr as nr_pinned in get_user_pages

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Date:   Thu, 13 Jun 2019 14:28:01 -0700
From:   Ira Weiny <ira.weiny@...el.com>
To:     Pingfan Liu <kernelfans@...il.com>
Cc:     linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Matthew Wilcox <willy@...radead.org>,
        John Hubbard <jhubbard@...dia.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        Keith Busch <keith.busch@...el.com>,
        Christoph Hellwig <hch@...radead.org>,
        Shuah Khan <shuah@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv4 1/3] mm/gup: rename nr as nr_pinned in
 get_user_pages_fast()

On Thu, Jun 13, 2019 at 06:45:00PM +0800, Pingfan Liu wrote:
> To better reflect the held state of pages and make code self-explaining,
> rename nr as nr_pinned.
> 
> Signed-off-by: Pingfan Liu <kernelfans@...il.com>

Reviewed-by: Ira Weiny <ira.weiny@...el.com>

> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Mike Rapoport <rppt@...ux.ibm.com>
> Cc: Dan Williams <dan.j.williams@...el.com>
> Cc: Matthew Wilcox <willy@...radead.org>
> Cc: John Hubbard <jhubbard@...dia.com>
> Cc: "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
> Cc: Keith Busch <keith.busch@...el.com>
> Cc: Christoph Hellwig <hch@...radead.org>
> Cc: Shuah Khan <shuah@...nel.org>
> Cc: linux-kernel@...r.kernel.org
> ---
>  mm/gup.c | 20 ++++++++++----------
>  1 file changed, 10 insertions(+), 10 deletions(-)
> 
> diff --git a/mm/gup.c b/mm/gup.c
> index f173fcb..766ae54 100644
> --- a/mm/gup.c
> +++ b/mm/gup.c
> @@ -2216,7 +2216,7 @@ int get_user_pages_fast(unsigned long start, int nr_pages,
>  			unsigned int gup_flags, struct page **pages)
>  {
>  	unsigned long addr, len, end;
> -	int nr = 0, ret = 0;
> +	int nr_pinned = 0, ret = 0;
>  
>  	start &= PAGE_MASK;
>  	addr = start;
> @@ -2231,25 +2231,25 @@ int get_user_pages_fast(unsigned long start, int nr_pages,
>  
>  	if (gup_fast_permitted(start, nr_pages)) {
>  		local_irq_disable();
> -		gup_pgd_range(addr, end, gup_flags, pages, &nr);
> +		gup_pgd_range(addr, end, gup_flags, pages, &nr_pinned);
>  		local_irq_enable();
> -		ret = nr;
> +		ret = nr_pinned;
>  	}
>  
> -	if (nr < nr_pages) {
> +	if (nr_pinned < nr_pages) {
>  		/* Try to get the remaining pages with get_user_pages */
> -		start += nr << PAGE_SHIFT;
> -		pages += nr;
> +		start += nr_pinned << PAGE_SHIFT;
> +		pages += nr_pinned;
>  
> -		ret = __gup_longterm_unlocked(start, nr_pages - nr,
> +		ret = __gup_longterm_unlocked(start, nr_pages - nr_pinned,
>  					      gup_flags, pages);
>  
>  		/* Have to be a bit careful with return values */
> -		if (nr > 0) {
> +		if (nr_pinned > 0) {
>  			if (ret < 0)
> -				ret = nr;
> +				ret = nr_pinned;
>  			else
> -				ret += nr;
> +				ret += nr_pinned;
>  		}
>  	}
>  
> -- 
> 2.7.5
>