linux-kernel - Re: [PATCH 19/49] writeback: add @gfp to wb

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Date:	Mon, 20 Apr 2015 17:41:30 +0200
From:	Jan Kara <jack@...e.cz>
To:	Tejun Heo <tj@...nel.org>
Cc:	axboe@...nel.dk, linux-kernel@...r.kernel.org, jack@...e.cz,
	hch@...radead.org, hannes@...xchg.org,
	linux-fsdevel@...r.kernel.org, vgoyal@...hat.com,
	lizefan@...wei.com, cgroups@...r.kernel.org, linux-mm@...ck.org,
	mhocko@...e.cz, clm@...com, fengguang.wu@...el.com,
	david@...morbit.com, gthelen@...gle.com
Subject: Re: [PATCH 19/49] writeback: add @gfp to wb_init()

On Mon 06-04-15 15:58:08, Tejun Heo wrote:
> wb_init() currently always uses GFP_KERNEL but the planned cgroup
> writeback support needs using other allocation masks.  Add @gfp to
> wb_init().
> 
> This patch doesn't introduce any behavior changes.
  OK.
Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Cc: Jens Axboe <axboe@...nel.dk>
> Cc: Jan Kara <jack@...e.cz>
> ---
>  mm/backing-dev.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/mm/backing-dev.c b/mm/backing-dev.c
> index b0707d1..805b287 100644
> --- a/mm/backing-dev.c
> +++ b/mm/backing-dev.c
> @@ -291,7 +291,8 @@ void wb_wakeup_delayed(struct bdi_writeback *wb)
>   */
>  #define INIT_BW		(100 << (20 - PAGE_SHIFT))
>  
> -static int wb_init(struct bdi_writeback *wb, struct backing_dev_info *bdi)
> +static int wb_init(struct bdi_writeback *wb, struct backing_dev_info *bdi,
> +		   gfp_t gfp)
>  {
>  	int i, err;
>  
> @@ -315,12 +316,12 @@ static int wb_init(struct bdi_writeback *wb, struct backing_dev_info *bdi)
>  	INIT_LIST_HEAD(&wb->work_list);
>  	INIT_DELAYED_WORK(&wb->dwork, wb_workfn);
>  
> -	err = fprop_local_init_percpu(&wb->completions, GFP_KERNEL);
> +	err = fprop_local_init_percpu(&wb->completions, gfp);
>  	if (err)
>  		return err;
>  
>  	for (i = 0; i < NR_WB_STAT_ITEMS; i++) {
> -		err = percpu_counter_init(&wb->stat[i], 0, GFP_KERNEL);
> +		err = percpu_counter_init(&wb->stat[i], 0, gfp);
>  		if (err) {
>  			while (--i)
>  				percpu_counter_destroy(&wb->stat[i]);
> @@ -378,7 +379,7 @@ int bdi_init(struct backing_dev_info *bdi)
>  	bdi->max_prop_frac = FPROP_FRAC_BASE;
>  	INIT_LIST_HEAD(&bdi->bdi_list);
>  
> -	err = wb_init(&bdi->wb, bdi);
> +	err = wb_init(&bdi->wb, bdi, GFP_KERNEL);
>  	if (err)
>  		return err;
>  
> -- 
> 2.1.0
> 
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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