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Commit 5bd7e6a3 authored by KOSAKI Motohiro's avatar KOSAKI Motohiro Committed by Linus Torvalds
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sparse: define __must_be_array() for __CHECKER__ 



commit c5e631cf ("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: default avatarKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Dave Hansen <dave@linux.vnet.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 903c0c7c

include/linux/compiler-gcc.h

+4 −0
Original line number Diff line number Diff line
@@ -34,8 +34,12 @@ 
    __asm__ ("" : "=r"(__ptr) : "0"(ptr));		\

    (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 */

#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,