Re: [PATCH V12 17/20] block: always define BIO_MAX_PAGES as 256

[Omar Sandoval]

On Mon, Nov 26, 2018 at 10:17:17AM +0800, Ming Lei wrote:
> Now multi-page bvec can cover CONFIG_THP_SWAP, so we don't need to
> increase BIO_MAX_PAGES for it.
> 
> CONFIG_THP_SWAP needs to split one THP into normal pages and adds
> them all to one bio. With multipage-bvec, it just takes one bvec to
> hold them all.
> 
> Reviewed-by: Christoph Hellwig <hch@xxxxxx>

Reviewed-by: Omar Sandoval <osandov@xxxxxx>

> Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx>
> ---
>  include/linux/bio.h | 8 --------
>  1 file changed, 8 deletions(-)
> 
> diff --git a/include/linux/bio.h b/include/linux/bio.h
> index 5505f74aef8b..7be48c55b14a 100644
> --- a/include/linux/bio.h
> +++ b/include/linux/bio.h
> @@ -34,15 +34,7 @@
>  #define BIO_BUG_ON
>  #endif
>  
> -#ifdef CONFIG_THP_SWAP
> -#if HPAGE_PMD_NR > 256
> -#define BIO_MAX_PAGES		HPAGE_PMD_NR
> -#else
>  #define BIO_MAX_PAGES		256
> -#endif
> -#else
> -#define BIO_MAX_PAGES		256
> -#endif
>  
>  #define bio_prio(bio)			(bio)->bi_ioprio
>  #define bio_set_prio(bio, prio)		((bio)->bi_ioprio = prio)
> -- 
> 2.9.5
>