diff options
Diffstat (limited to 'mm/memory_hotplug.c')
| -rw-r--r-- | mm/memory_hotplug.c | 27 |
1 files changed, 15 insertions, 12 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 124e794867c5..1ad28323fb9f 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -1188,11 +1188,13 @@ static inline int pageblock_free(struct page *page) return PageBuddy(page) && page_order(page) >= pageblock_order; } -/* Return the start of the next active pageblock after a given page */ -static struct page *next_active_pageblock(struct page *page) +/* Return the pfn of the start of the next active pageblock after a given pfn */ +static unsigned long next_active_pageblock(unsigned long pfn) { + struct page *page = pfn_to_page(pfn); + /* Ensure the starting page is pageblock-aligned */ - BUG_ON(page_to_pfn(page) & (pageblock_nr_pages - 1)); + BUG_ON(pfn & (pageblock_nr_pages - 1)); /* If the entire pageblock is free, move to the end of free page */ if (pageblock_free(page)) { @@ -1200,16 +1202,16 @@ static struct page *next_active_pageblock(struct page *page) /* be careful. we don't have locks, page_order can be changed.*/ order = page_order(page); if ((order < MAX_ORDER) && (order >= pageblock_order)) - return page + (1 << order); + return pfn + (1 << order); } - return page + pageblock_nr_pages; + return pfn + pageblock_nr_pages; } -static bool is_pageblock_removable_nolock(struct page *page) +static bool is_pageblock_removable_nolock(unsigned long pfn) { + struct page *page = pfn_to_page(pfn); struct zone *zone; - unsigned long pfn; /* * We have to be careful here because we are iterating over memory @@ -1232,13 +1234,14 @@ static bool is_pageblock_removable_nolock(struct page *page) /* Checks if this range of memory is likely to be hot-removable. */ bool is_mem_section_removable(unsigned long start_pfn, unsigned long nr_pages) { - struct page *page = pfn_to_page(start_pfn); - unsigned long end_pfn = min(start_pfn + nr_pages, zone_end_pfn(page_zone(page))); - struct page *end_page = pfn_to_page(end_pfn); + unsigned long end_pfn, pfn; + + end_pfn = min(start_pfn + nr_pages, + zone_end_pfn(page_zone(pfn_to_page(start_pfn)))); /* Check the starting page of each pageblock within the range */ - for (; page < end_page; page = next_active_pageblock(page)) { - if (!is_pageblock_removable_nolock(page)) + for (pfn = start_pfn; pfn < end_pfn; pfn = next_active_pageblock(pfn)) { + if (!is_pageblock_removable_nolock(pfn)) return false; cond_resched(); } |