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mm/memory_hotplug: export generic_online_page()

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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>
This commit is contained in:
David Hildenbrand 2019-11-30 17:53:51 -08:00 committed by Linus Torvalds
parent dca4436d1c
commit 18db149120
2 changed files with 3 additions and 3 deletions
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1
include/linux/memory_hotplug.h
View File

@ -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);

5
mm/memory_hotplug.c
View File

@ -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)