Re: [PATCH v2 3/5] mm/hwpoison: introduce put_hwpoison_page to put refcount for memory error handling

[Naoya Horiguchi]

On Mon, Aug 10, 2015 at 07:28:21PM +0800, Wanpeng Li wrote:
> Introduce put_hwpoison_page to put refcount for memory 
> error handling. 
> 
> Suggested-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
> Signed-off-by: Wanpeng Li <wanpeng.li@xxxxxxxxxxx>

Thanks!

Acked-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>

> ---
>  include/linux/mm.h  |    1 +
>  mm/memory-failure.c |   21 +++++++++++++++++++++
>  2 files changed, 22 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 554b0f0..c0a0b9f 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -2103,6 +2103,7 @@ extern int memory_failure(unsigned long pfn, int trapno, int flags);
>  extern void memory_failure_queue(unsigned long pfn, int trapno, int flags);
>  extern int unpoison_memory(unsigned long pfn);
>  extern int get_hwpoison_page(struct page *page);
> +extern void put_hwpoison_page(struct page *page);
>  extern int sysctl_memory_failure_early_kill;
>  extern int sysctl_memory_failure_recovery;
>  extern void shake_page(struct page *p, int access);
> diff --git a/mm/memory-failure.c b/mm/memory-failure.c
> index e0eb7ab..fa9aa21 100644
> --- a/mm/memory-failure.c
> +++ b/mm/memory-failure.c
> @@ -922,6 +922,27 @@ int get_hwpoison_page(struct page *page)
>  }
>  EXPORT_SYMBOL_GPL(get_hwpoison_page);
>  
> +/**
> + * put_hwpoison_page() - Put refcount for memory error handling:
> + * @page:	raw error page (hit by memory error)
> + */
> +void put_hwpoison_page(struct page *page)
> +{
> +	struct page *head = compound_head(page);
> +
> +	if (PageHuge(head)) {
> +		put_page(head);
> +		return;
> +	}
> +
> +	if (PageTransHuge(head))
> +		if (page != head)
> +			put_page(head);
> +
> +	put_page(page);
> +}
> +EXPORT_SYMBOL_GPL(put_hwpoison_page);
> +
>  /*
>   * Do all that is necessary to remove user space mappings. Unmap
>   * the pages and send SIGBUS to the processes if the data was dirty.
> -- 
> 1.7.1
> --
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