[PATCH] define __must_be_array() for __CHECKER__

From: KOSAKI Motohiro
Date: Fri Apr 15 2011 - 00:28:16 EST

commit c5e631cf65f (ARRAY_SIZE: check for type) added __must_be_array().
but sparse can't parse this gcc extention.

Then, now make C=2 makes following sparse errors a lot.

kernel/futex.c:2699:25: error: No right hand side of '+'-expression

Because __must_be_array() is used for ARRAY_SIZE() macro and it is
used very widely.

This patch fixes it.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
include/linux/compiler-gcc.h | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
index cb4c1eb..59e4028 100644
--- a/include/linux/compiler-gcc.h
+++ b/include/linux/compiler-gcc.h
@@ -34,8 +34,12 @@
__asm__ ("" : "=r"(__ptr) : "0"(ptr)); \
(typeof(ptr)) (__ptr + (off)); })

+#ifdef __CHECKER__
+#define __must_be_array(arr) 0
/* &a[0] degrades to a pointer: a different type from an array */
#define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))

* Force always-inline if the user requests it so via the .config,

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