diff options
| author |   Konstantin Khlebnikov <khlebnikov@openvz.org> | 2012-05-29 15:06:28 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2012-05-29 16:22:20 -0700 |
| commit | 02602a18c32d76f0e0f50eefa91b2d53c8a3a751 (patch) | |
| tree | 64a2645d05cd57731e7d2f5bd0ef390de8b5e76b /include/linux/mmdebug.h | |
| parent | bug: introduce BUILD_BUG_ON_INVALID() macro (diff) | |
| download | linux-dev-02602a18c32d76f0e0f50eefa91b2d53c8a3a751.tar.xz linux-dev-02602a18c32d76f0e0f50eefa91b2d53c8a3a751.zip | |
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.h | 2 |
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 @@ #ifdef CONFIG_DEBUG_VM #define VM_BUG_ON(cond) BUG_ON(cond) #else -#define VM_BUG_ON(cond) do { (void)(cond); } while (0) +#define VM_BUG_ON(cond) BUILD_BUG_ON_INVALID(cond) #endif #ifdef CONFIG_DEBUG_VIRTUAL |