linux-ext4 - Re: [PATCH v6 08/13] mm: call pgmap->ops->page_free for DEVICE

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Date:   Sun, 15 Aug 2021 17:40:47 +0200
From:   Christoph Hellwig <hch@....de>
To:     Alex Sierra <alex.sierra@....com>
Cc:     akpm@...ux-foundation.org, Felix.Kuehling@....com,
        linux-mm@...ck.org, rcampbell@...dia.com,
        linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        hch@....de, jgg@...dia.com, jglisse@...hat.com,
        Roger Pau Monne <roger.pau@...rix.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>
Subject: Re: [PATCH v6 08/13] mm: call pgmap->ops->page_free for
 DEVICE_GENERIC pages

On Fri, Aug 13, 2021 at 01:31:45AM -0500, Alex Sierra wrote:
> Add MEMORY_DEVICE_GENERIC case to free_zone_device_page callback.
> Device generic type memory case is now able to free its pages properly.

How is this going to work for the two existing MEMORY_DEVICE_GENERIC
that now change behavior?  And which don't have a ->page_free callback
at all?

> 
> Signed-off-by: Alex Sierra <alex.sierra@....com>
> ---
>  mm/memremap.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/memremap.c b/mm/memremap.c
> index 5aa8163fd948..5773e15b6ac9 100644
> --- a/mm/memremap.c
> +++ b/mm/memremap.c
> @@ -459,7 +459,7 @@ struct dev_pagemap *get_dev_pagemap(unsigned long pfn,
>  EXPORT_SYMBOL_GPL(get_dev_pagemap);
>  
>  #ifdef CONFIG_DEV_PAGEMAP_OPS
> -static void free_device_private_page(struct page *page)
> +static void free_device_page(struct page *page)
>  {
>  
>  	__ClearPageWaiters(page);
> @@ -498,7 +498,8 @@ void free_zone_device_page(struct page *page)
>  		wake_up_var(&page->_refcount);
>  		return;
>  	case MEMORY_DEVICE_PRIVATE:
> -		free_device_private_page(page);
> +	case MEMORY_DEVICE_GENERIC:
> +		free_device_page(page);
>  		return;
>  	default:
>  		return;
> -- 
> 2.32.0
---end quoted text---