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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