From: David Hildenbrand <david@xxxxxxxxxx> Subject: mm/memory_hotplug: export generic_online_page() 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@xxxxxxxxxx Signed-off-by: David Hildenbrand <david@xxxxxxxxxx> Acked-by: Michal Hocko <mhocko@xxxxxxxx> Cc: Oscar Salvador <osalvador@xxxxxxxx> Cc: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx> Cc: Dan Williams <dan.j.williams@xxxxxxxxx> Cc: Wei Yang <richard.weiyang@xxxxxxxxx> Cc: Qian Cai <cai@xxxxxx> Cc: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx> Cc: "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx> Cc: Sasha Levin <sashal@xxxxxxxxxx> Cc: Stephen Hemminger <sthemmin@xxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- include/linux/memory_hotplug.h | 1 + mm/memory_hotplug.c | 5 ++--- 2 files changed, 3 insertions(+), 3 deletions(-) --- a/include/linux/memory_hotplug.h~mm-memory_hotplug-export-generic_online_page +++ a/include/linux/memory_hotplug.h @@ -102,6 +102,7 @@ extern unsigned long __offline_isolated_ 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); --- a/mm/memory_hotplug.c~mm-memory_hotplug-export-generic_online_page +++ a/mm/memory_hotplug.c @@ -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 *pag } 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 p 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) _
