linux-kernel - Re: [PATCH 7/8] bdi: simplify bdi

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Date:   Thu, 16 Apr 2020 14:06:59 +0200
From:   Jan Kara <jack@...e.cz>
To:     Christoph Hellwig <hch@....de>
Cc:     axboe@...nel.dk, yuyufen@...wei.com, tj@...nel.org, jack@...e.cz,
        bvanassche@....org, tytso@....edu, gregkh@...uxfoundation.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/8] bdi: simplify bdi_alloc

On Thu 16-04-20 09:15:18, Christoph Hellwig wrote:
> Merge the _node vs normal version and drop the superflous gfp_t argument.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>

Looks good to me. You can add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  block/blk-core.c            | 2 +-
>  drivers/mtd/mtdcore.c       | 2 +-
>  fs/super.c                  | 2 +-
>  include/linux/backing-dev.h | 6 +-----
>  mm/backing-dev.c            | 7 +++----
>  5 files changed, 7 insertions(+), 12 deletions(-)
> 
> diff --git a/block/blk-core.c b/block/blk-core.c
> index 7e4a1da0715e..ab87f2833ab2 100644
> --- a/block/blk-core.c
> +++ b/block/blk-core.c
> @@ -484,7 +484,7 @@ struct request_queue *__blk_alloc_queue(int node_id)
>  	if (ret)
>  		goto fail_id;
>  
> -	q->backing_dev_info = bdi_alloc_node(GFP_KERNEL, node_id);
> +	q->backing_dev_info = bdi_alloc(node_id);
>  	if (!q->backing_dev_info)
>  		goto fail_split;
>  
> diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
> index 2916674208b3..39ec563d9a14 100644
> --- a/drivers/mtd/mtdcore.c
> +++ b/drivers/mtd/mtdcore.c
> @@ -2036,7 +2036,7 @@ static struct backing_dev_info * __init mtd_bdi_init(char *name)
>  	struct backing_dev_info *bdi;
>  	int ret;
>  
> -	bdi = bdi_alloc(GFP_KERNEL);
> +	bdi = bdi_alloc(NUMA_NO_NODE);
>  	if (!bdi)
>  		return ERR_PTR(-ENOMEM);
>  
> diff --git a/fs/super.c b/fs/super.c
> index cd352530eca9..dd28fcd706ff 100644
> --- a/fs/super.c
> +++ b/fs/super.c
> @@ -1598,7 +1598,7 @@ int super_setup_bdi_name(struct super_block *sb, char *fmt, ...)
>  	int err;
>  	va_list args;
>  
> -	bdi = bdi_alloc(GFP_KERNEL);
> +	bdi = bdi_alloc(NUMA_NO_NODE);
>  	if (!bdi)
>  		return -ENOMEM;
>  
> diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
> index 4098ed6ba6b4..6b3504bf7a42 100644
> --- a/include/linux/backing-dev.h
> +++ b/include/linux/backing-dev.h
> @@ -36,11 +36,7 @@ int bdi_register_va(struct backing_dev_info *bdi, const char *fmt,
>  void bdi_set_owner(struct backing_dev_info *bdi, struct device *owner);
>  void bdi_unregister(struct backing_dev_info *bdi);
>  
> -struct backing_dev_info *bdi_alloc_node(gfp_t gfp_mask, int node_id);
> -static inline struct backing_dev_info *bdi_alloc(gfp_t gfp_mask)
> -{
> -	return bdi_alloc_node(gfp_mask, NUMA_NO_NODE);
> -}
> +struct backing_dev_info *bdi_alloc(int node_id);
>  
>  void wb_start_background_writeback(struct bdi_writeback *wb);
>  void wb_workfn(struct work_struct *work);
> diff --git a/mm/backing-dev.c b/mm/backing-dev.c
> index 1ba9a7b30933..119a41650833 100644
> --- a/mm/backing-dev.c
> +++ b/mm/backing-dev.c
> @@ -865,12 +865,11 @@ static int bdi_init(struct backing_dev_info *bdi)
>  	return ret;
>  }
>  
> -struct backing_dev_info *bdi_alloc_node(gfp_t gfp_mask, int node_id)
> +struct backing_dev_info *bdi_alloc(int node_id)
>  {
>  	struct backing_dev_info *bdi;
>  
> -	bdi = kmalloc_node(sizeof(struct backing_dev_info),
> -			   gfp_mask | __GFP_ZERO, node_id);
> +	bdi = kzalloc_node(sizeof(*bdi), GFP_KERNEL, node_id);
>  	if (!bdi)
>  		return NULL;
>  
> @@ -880,7 +879,7 @@ struct backing_dev_info *bdi_alloc_node(gfp_t gfp_mask, int node_id)
>  	}
>  	return bdi;
>  }
> -EXPORT_SYMBOL(bdi_alloc_node);
> +EXPORT_SYMBOL(bdi_alloc);
>  
>  static struct rb_node **bdi_lookup_rb_node(u64 id, struct rb_node **parentp)
>  {
> -- 
> 2.25.1
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR