[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>
diff --git a/mm/memory.c b/mm/memory.c
index 6af555c..71bc664 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -388,7 +388,7 @@
{
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 @@
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