linux-kernel - Re: [PATCH] mm: change tlb_finish

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Date:	Wed, 4 Nov 2015 10:33:35 +0200
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	yalin wang <yalin.wang2010@...il.com>
Cc:	akpm@...ux-foundation.org, kirill.shutemov@...ux.intel.com,
	mgorman@...e.de, hannes@...xchg.org, riel@...hat.com,
	raindel@...lanox.com, willy@...ux.intel.com, boaz@...xistor.com,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: change tlb_finish_mmu() to be more simple

On Wed, Nov 04, 2015 at 03:35:31PM +0800, yalin wang wrote:
> This patch remove unneeded *next temp variable,
> make this function more simple to read.
> 
> Signed-off-by: yalin wang <yalin.wang2010@...il.com>
> ---
>  mm/memory.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/mm/memory.c b/mm/memory.c
> index 7f3b9f2..f0040ed 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -270,17 +270,16 @@ void tlb_flush_mmu(struct mmu_gather *tlb)
>   */
>  void tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
>  {
> -	struct mmu_gather_batch *batch, *next;
> +	struct mmu_gather_batch *batch;
>  
>  	tlb_flush_mmu(tlb);
>  
>  	/* keep the page table cache within bounds */
>  	check_pgt_cache();
>  
> -	for (batch = tlb->local.next; batch; batch = next) {
> -		next = batch->next;
> +	for (batch = tlb->local.next; batch; batch = batch->next)

Use after free? No, thanks.

>  		free_pages((unsigned long)batch, 0);
> -	}
> +
>  	tlb->local.next = NULL;
>  }
>  
> -- 
> 1.9.1
> 
> --
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-- 
 Kirill A. Shutemov
--
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