[PATCH] mm: locks_freed fix

Move the lock debug checks below the page reserved checks.  Also, having
debug_check_no_locks_freed in kernel_map_pages is wrong.

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/include/linux/mm.h b/include/linux/mm.h
index 2614662..5a6068f 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1103,12 +1103,7 @@ static inline void vm_stat_account(struct mm_struct *mm,
 
 #ifndef CONFIG_DEBUG_PAGEALLOC
 static inline void
-kernel_map_pages(struct page *page, int numpages, int enable)
-{
-       if (!PageHighMem(page) && !enable)
-               debug_check_no_locks_freed(page_address(page),
-                                          numpages * PAGE_SIZE);
-}
+kernel_map_pages(struct page *page, int numpages, int enable) {}
 #endif
 
 extern struct vm_area_struct *get_gate_vma(struct task_struct *tsk);

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index c5caac2..40db96a 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -495,15 +495,13 @@ static void __free_pages_ok(struct page *page, unsigned int order)
        int i;
        int reserved = 0;
 
-       if (!PageHighMem(page))
-               debug_check_no_locks_freed(page_address(page),
-                                          PAGE_SIZE<<order);
-
        for (i = 0 ; i < (1 << order) ; ++i)
                reserved += free_pages_check(page + i);
        if (reserved)
                return;
 
+       if (!PageHighMem(page))
+               debug_check_no_locks_freed(page_address(page),PAGE_SIZE<<order);
        arch_free_page(page, order);
        kernel_map_pages(page, 1 << order, 0);
 
@@ -787,6 +785,8 @@ static void fastcall free_hot_cold_page(struct page *page, int cold)
        if (free_pages_check(page))
                return;
 
+       if (!PageHighMem(page))
+               debug_check_no_locks_freed(page_address(page), PAGE_SIZE);
        arch_free_page(page, 0);
        kernel_map_pages(page, 1, 0);