mm/hwpoison: introduce put_hwpoison_page to put refcount for memory error handling (94bf4ec8) · Commits · 戴 / test

include/linux/mm.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -2169,6 +2169,7 @@ 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);

+21 −0

Original line number	Diff line number	Diff line
		@@ -934,6 +934,27 @@ 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.