[PATCH] mm: VM_BUG_ON
Introduce a VM_BUG_ON, which is turned on with CONFIG_DEBUG_VM. Use this
in the lightweight, inline refcounting functions; PageLRU and PageActive
checks in vmscan, because they're pretty well confined to vmscan. And in
page allocate/free fastpaths which can be the hottest parts of the kernel
for kbuilds.
Unlike BUG_ON, VM_BUG_ON must not be used to execute statements with
side-effects, and should not be used outside core mm code.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: Christoph Lameter <clameter@engr.sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/mm/internal.h b/mm/internal.h
index d20e3cc..d527b80 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -24,8 +24,8 @@
*/
static inline void set_page_refcounted(struct page *page)
{
- BUG_ON(PageCompound(page) && page_private(page) != (unsigned long)page);
- BUG_ON(atomic_read(&page->_count));
+ VM_BUG_ON(PageCompound(page) && page_private(page) != (unsigned long)page);
+ VM_BUG_ON(atomic_read(&page->_count));
set_page_count(page, 1);
}
