Re: [PATCH 1/5] mm/vmalloc: query dynamic DEBUG_PAGEALLOC setting

[Christian Borntraeger]

On 02/04/2016 06:56 AM, Joonsoo Kim wrote:
> We can disable debug_pagealloc processing even if the code is complied
> with CONFIG_DEBUG_PAGEALLOC. This patch changes the code to query
> whether it is enabled or not in runtime.
> 
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>

Reviewed-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>


> ---
>  mm/vmalloc.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/mm/vmalloc.c b/mm/vmalloc.c
> index fb42a5b..e0e51bd 100644
> --- a/mm/vmalloc.c
> +++ b/mm/vmalloc.c
> @@ -543,10 +543,10 @@ static void vmap_debug_free_range(unsigned long start, unsigned long end)
>  	 * debugging doesn't do a broadcast TLB flush so it is a lot
>  	 * faster).
>  	 */
> -#ifdef CONFIG_DEBUG_PAGEALLOC
> -	vunmap_page_range(start, end);
> -	flush_tlb_kernel_range(start, end);
> -#endif
> +	if (debug_pagealloc_enabled()) {
> +		vunmap_page_range(start, end);
> +		flush_tlb_kernel_range(start, end);
> +	}
>  }
> 
>  /*
>