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authorKonstantin Khlebnikov <khlebnikov@openvz.org>2012-05-29 18:06:28 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2012-05-29 19:22:20 -0400
commit02602a18c32d76f0e0f50eefa91b2d53c8a3a751 (patch)
tree64a2645d05cd57731e7d2f5bd0ef390de8b5e76b /include/linux/mmdebug.h
parentbaf05aa9271bdbc07d3160035a231abc5fbd429a (diff)
bug: completely remove code generated by disabled VM_BUG_ON()
Even if CONFIG_DEBUG_VM=n gcc genereates code for some VM_BUG_ON() for example VM_BUG_ON(!PageCompound(page) || !PageHead(page)); in do_huge_pmd_wp_page() generates 114 bytes of code. But they mostly disappears when I split this VM_BUG_ON into two: -VM_BUG_ON(!PageCompound(page) || !PageHead(page)); +VM_BUG_ON(!PageCompound(page)); +VM_BUG_ON(!PageHead(page)); weird... but anyway after this patch code disappears completely. add/remove: 0/0 grow/shrink: 7/97 up/down: 135/-1784 (-1649) Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Cong Wang <xiyou.wangcong@gmail.com> Cc: Hugh Dickins <hughd@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/mmdebug.h')
-rw-r--r--include/linux/mmdebug.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/mmdebug.h b/include/linux/mmdebug.h
index c04ecfe03f7f..580bd587d916 100644
--- a/include/linux/mmdebug.h
+++ b/include/linux/mmdebug.h
@@ -4,7 +4,7 @@
4#ifdef CONFIG_DEBUG_VM 4#ifdef CONFIG_DEBUG_VM
5#define VM_BUG_ON(cond) BUG_ON(cond) 5#define VM_BUG_ON(cond) BUG_ON(cond)
6#else 6#else
7#define VM_BUG_ON(cond) do { (void)(cond); } while (0) 7#define VM_BUG_ON(cond) BUILD_BUG_ON_INVALID(cond)
8#endif 8#endif
9 9
10#ifdef CONFIG_DEBUG_VIRTUAL 10#ifdef CONFIG_DEBUG_VIRTUAL