diff options
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/memory_hotplug.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index abe43c1ae920..fc6cdd99941b 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -301,6 +301,22 @@ static int check_hotplug_memory_addressable(unsigned long pfn, } /* + * Return page for the valid pfn only if the page is online. All pfn + * walkers which rely on the fully initialized page->flags and others + * should use this rather than pfn_valid && pfn_to_page + */ +struct page *pfn_to_online_page(unsigned long pfn) +{ + unsigned long nr = pfn_to_section_nr(pfn); + + if (nr < NR_MEM_SECTIONS && online_section_nr(nr) && + pfn_valid_within(pfn)) + return pfn_to_page(pfn); + return NULL; +} +EXPORT_SYMBOL_GPL(pfn_to_online_page); + +/* * Reasonably generic function for adding memory. It is * expected that archs that support memory hotplug will * call this function after deciding the zone to which to |