[PATCH] mm: arch_free_page fix

After the PG_reserved check was added, arch_free_page was being called in the
wrong place (it could be called for a page we don't actually want to free).
Fix that.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 8246e83..c5caac2 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -495,7 +495,6 @@ static void __free_pages_ok(struct page *page, unsigned int order)
        int i;
        int reserved = 0;
 
-       arch_free_page(page, order);
        if (!PageHighMem(page))
                debug_check_no_locks_freed(page_address(page),
                                           PAGE_SIZE<<order);
@@ -505,7 +504,9 @@ static void __free_pages_ok(struct page *page, unsigned int order)
        if (reserved)
                return;
 
+       arch_free_page(page, order);
        kernel_map_pages(page, 1 << order, 0);
+
        local_irq_save(flags);
        __count_vm_events(PGFREE, 1 << order);
        free_one_page(page_zone(page), page, order);
@@ -781,13 +782,12 @@ static void fastcall free_hot_cold_page(struct page *page, int cold)
        struct per_cpu_pages *pcp;
        unsigned long flags;
 
-       arch_free_page(page, 0);
-
        if (PageAnon(page))
                page->mapping = NULL;
        if (free_pages_check(page))
                return;
 
+       arch_free_page(page, 0);
        kernel_map_pages(page, 1, 0);
 
        pcp = &zone_pcp(zone, get_cpu())->pcp[cold];