cls_can: Fixed protocol restriction + minor changes.

[lisovros/linux_canprio.git] / mm / memory_hotplug.c

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index a4cfcdc00455de4be15fcec98c76e45f8de5feab..6345dfe78d2cbb6e104247886c4f8765f538f809 100644 (file)
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -584,19 +584,19 @@ static inline int pageblock_free(struct page *page)
 /* Return the start of the next active pageblock after a given page */
 static struct page *next_active_pageblock(struct page *page)
 {
-       int pageblocks_stride;
-
        /* Ensure the starting page is pageblock-aligned */
        BUG_ON(page_to_pfn(page) & (pageblock_nr_pages - 1));
 
-       /* Move forward by at least 1 * pageblock_nr_pages */
-       pageblocks_stride = 1;
-
        /* If the entire pageblock is free, move to the end of free page */
-       if (pageblock_free(page))
-               pageblocks_stride += page_order(page) - pageblock_order;
+       if (pageblock_free(page)) {
+               int order;
+               /* 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 page + (pageblocks_stride * pageblock_nr_pages);
+       return page + pageblock_nr_pages;
 }
 
 /* Checks if this range of memory is likely to be hot-removable. */
@@ -659,7 +659,7 @@ static int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn)
  * Scanning pfn is much easier than scanning lru list.
  * Scan pfn from start to end and Find LRU page.
  */
-int scan_lru_pages(unsigned long start, unsigned long end)
+unsigned long scan_lru_pages(unsigned long start, unsigned long end)
 {
        unsigned long pfn;
        struct page *page;