mm/memory_hotplug: export generic_online_page() (18db1491) · Commits · 戴 / test

Patch series "mm/memory_hotplug: Export generic_online_page()". Let's replace the __online_page...() functions by generic_online_page(). Hyper-V only wants to delay the actual onlining of un-backed pages, so we can simpy re-use the generic function. This patch (of 3): Let's expose generic_online_page() so online_page_callback users can simply fall back to the generic implementation when actually deciding to online the pages. Link: http://lkml.kernel.org/r/20190909114830.662-2-david@redhat.com Signed-off-by:

David Hildenbrand <david@redhat.com> Acked-by:

Michal Hocko <mhocko@suse.com> Cc: Oscar Salvador <osalvador@suse.com> Cc: Pavel Tatashin <pasha.tatashin@soleen.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Wei Yang <richard.weiyang@gmail.com> Cc: Qian Cai <cai@lca.pw> Cc: Haiyang Zhang <haiyangz@microsoft.com> Cc: "K. Y. Srinivasan" <kys@microsoft.com> Cc: Sasha Levin <sashal@kernel.org> Cc: Stephen Hemminger <sthemmin@microsoft.com> Signed-off-by:

Andrew Morton <akpm@linux-foundation.org> Signed-off-by:

Linus Torvalds <torvalds@linux-foundation.org>

include/linux/memory_hotplug.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -102,6 +102,7 @@ extern unsigned long __offline_isolated_pages(unsigned long start_pfn,

		typedef void (online_page_callback_t)(struct page page, unsigned int order);

		extern void generic_online_page(struct page *page, unsigned int order);
		extern int set_online_page_callback(online_page_callback_t callback);
		extern int restore_online_page_callback(online_page_callback_t callback);

mm/memory_hotplug.c

+2 −3

Original line number	Diff line number	Diff line
		@@ -49,8 +49,6 @@
		* and restore_online_page_callback() for generic callback restore.
		*/

		static void generic_online_page(struct page *page, unsigned int order);

		static online_page_callback_t online_page_callback = generic_online_page;
		static DEFINE_MUTEX(online_page_callback_lock);

		@@ -617,7 +615,7 @@ void __online_page_free(struct page *page)
		}
		EXPORT_SYMBOL_GPL(__online_page_free);

		static void generic_online_page(struct page *page, unsigned int order)
		void generic_online_page(struct page *page, unsigned int order)
		{
		kernel_map_pages(page, 1 << order, 1);
		__free_pages_core(page, order);
		@@ -627,6 +625,7 @@ static void generic_online_page(struct page *page, unsigned int order)
		totalhigh_pages_add(1UL << order);
		#endif
		}
		EXPORT_SYMBOL_GPL(generic_online_page);

		static int online_pages_range(unsigned long start_pfn, unsigned long nr_pages,
		void *arg)

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