[PATCH] mm: more CONFIG_DEBUG_VM

Put a few more checks under CONFIG_DEBUG_VM

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

1 files changed, 3 insertions, 9 deletions

diff --git a/mm/memory.c b/mm/memory.c
index 6af555c1c42a..71bc664efed5 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -388,7 +388,7 @@ struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, pte_
 {
         unsigned long pfn = pte_pfn(pte);
 
-        if (vma->vm_flags & VM_PFNMAP) {
+        if (unlikely(vma->vm_flags & VM_PFNMAP)) {
                 unsigned long off = (addr - vma->vm_start) >> PAGE_SHIFT;
                 if (pfn == vma->vm_pgoff + off)
                         return NULL;
@@ -396,18 +396,12 @@ struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, pte_
                         return NULL;
         }
 
-        /*
-         * Add some anal sanity checks for now. Eventually,
-         * we should just do "return pfn_to_page(pfn)", but
-         * in the meantime we check that we get a valid pfn,
-         * and that the resulting page looks ok.
-         *
-         * Remove this test eventually!
-         */
+#ifdef CONFIG_DEBUG_VM
         if (unlikely(!pfn_valid(pfn))) {
                 print_bad_pte(vma, pte, addr);
                 return NULL;
         }
+#endif
 
         /*
          * NOTE! We still have PageReserved() pages in the page