Re: [PATCH] mm: change tlb_finish_mmu() to be more simple

["Kirill A. Shutemov" <kirill@shutemov.name>]

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@gmail.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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