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sparse: define __must_be_array() for __CHECKER__

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commit c5e631cf65 ("ARRAY_SIZE: check for type") added __must_be_array().
But sparse can't parse this gcc extention.

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@jp.fujitsu.com>
Cc: Dave Hansen <dave@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
KOSAKI Motohiro 2011-05-24 17:13:17 -07:00 committed by Linus Torvalds
parent 903c0c7cdc
commit 5bd7e6a30e
1 changed files with 4 additions and 0 deletions
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4
include/linux/compiler-gcc.h
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@ -34,8 +34,12 @@
__asm__ ("" : "=r"(__ptr) : "0"(ptr)); \ __asm__ ("" : "=r"(__ptr) : "0"(ptr)); \
(typeof(ptr)) (__ptr + (off)); }) (typeof(ptr)) (__ptr + (off)); })
#ifdef __CHECKER__
#define __must_be_array(arr) 0
#else
/* &a[0] degrades to a pointer: a different type from an array */ /* &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])) #define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
#endif
/* /*
* Force always-inline if the user requests it so via the .config, * Force always-inline if the user requests it so via the .config,