Re: [PATCH 16/25] device-dax: use the dev_pagemap internal refcount

[Ira Weiny]

On Wed, Jun 26, 2019 at 02:27:15PM +0200, Christoph Hellwig wrote:
> The functionality is identical to the one currently open coded in
> device-dax.
> 
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>

Reviewed-by: Ira Weiny <ira.weiny@xxxxxxxxx>

> ---
>  drivers/dax/dax-private.h |  4 ----
>  drivers/dax/device.c      | 43 ---------------------------------------
>  2 files changed, 47 deletions(-)
> 
> diff --git a/drivers/dax/dax-private.h b/drivers/dax/dax-private.h
> index b4177aafbbd1..c915889d1769 100644
> --- a/drivers/dax/dax-private.h
> +++ b/drivers/dax/dax-private.h
> @@ -43,8 +43,6 @@ struct dax_region {
>   * @target_node: effective numa node if dev_dax memory range is onlined
>   * @dev - device core
>   * @pgmap - pgmap for memmap setup / lifetime (driver owned)
> - * @ref: pgmap reference count (driver owned)
> - * @cmp: @ref final put completion (driver owned)
>   */
>  struct dev_dax {
>  	struct dax_region *region;
> @@ -52,8 +50,6 @@ struct dev_dax {
>  	int target_node;
>  	struct device dev;
>  	struct dev_pagemap pgmap;
> -	struct percpu_ref ref;
> -	struct completion cmp;
>  };
>  
>  static inline struct dev_dax *to_dev_dax(struct device *dev)
> diff --git a/drivers/dax/device.c b/drivers/dax/device.c
> index b5257038c188..1af823b2fe6b 100644
> --- a/drivers/dax/device.c
> +++ b/drivers/dax/device.c
> @@ -14,36 +14,6 @@
>  #include "dax-private.h"
>  #include "bus.h"
>  
> -static struct dev_dax *ref_to_dev_dax(struct percpu_ref *ref)
> -{
> -	return container_of(ref, struct dev_dax, ref);
> -}
> -
> -static void dev_dax_percpu_release(struct percpu_ref *ref)
> -{
> -	struct dev_dax *dev_dax = ref_to_dev_dax(ref);
> -
> -	dev_dbg(&dev_dax->dev, "%s\n", __func__);
> -	complete(&dev_dax->cmp);
> -}
> -
> -static void dev_dax_percpu_exit(struct dev_pagemap *pgmap)
> -{
> -	struct dev_dax *dev_dax = container_of(pgmap, struct dev_dax, pgmap);
> -
> -	dev_dbg(&dev_dax->dev, "%s\n", __func__);
> -	wait_for_completion(&dev_dax->cmp);
> -	percpu_ref_exit(pgmap->ref);
> -}
> -
> -static void dev_dax_percpu_kill(struct dev_pagemap *pgmap)
> -{
> -	struct dev_dax *dev_dax = container_of(pgmap, struct dev_dax, pgmap);
> -
> -	dev_dbg(&dev_dax->dev, "%s\n", __func__);
> -	percpu_ref_kill(pgmap->ref);
> -}
> -
>  static int check_vma(struct dev_dax *dev_dax, struct vm_area_struct *vma,
>  		const char *func)
>  {
> @@ -441,11 +411,6 @@ static void dev_dax_kill(void *dev_dax)
>  	kill_dev_dax(dev_dax);
>  }
>  
> -static const struct dev_pagemap_ops dev_dax_pagemap_ops = {
> -	.kill		= dev_dax_percpu_kill,
> -	.cleanup	= dev_dax_percpu_exit,
> -};
> -
>  int dev_dax_probe(struct device *dev)
>  {
>  	struct dev_dax *dev_dax = to_dev_dax(dev);
> @@ -463,15 +428,7 @@ int dev_dax_probe(struct device *dev)
>  		return -EBUSY;
>  	}
>  
> -	init_completion(&dev_dax->cmp);
> -	rc = percpu_ref_init(&dev_dax->ref, dev_dax_percpu_release, 0,
> -			GFP_KERNEL);
> -	if (rc)
> -		return rc;
> -
> -	dev_dax->pgmap.ref = &dev_dax->ref;
>  	dev_dax->pgmap.type = MEMORY_DEVICE_DEVDAX;
> -	dev_dax->pgmap.ops = &dev_dax_pagemap_ops;
>  	addr = devm_memremap_pages(dev, &dev_dax->pgmap);
>  	if (IS_ERR(addr))
>  		return PTR_ERR(addr);
> -- 
> 2.20.1
> 
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