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split the typecheck macros out of include/linux/kernel.h

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Needed to fix up a recursive include snafu in
locking-add-typecheck-on-irqsave-and-friends-for-correct-flags.patch

Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrew Morton 2008-07-25 01:45:24 -07:00 committed by Linus Torvalds
parent 5df439ef06
commit e0deaff470
2 changed files with 25 additions and 20 deletions
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21
include/linux/kernel.h
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@ -14,6 +14,7 @@
#include <linux/compiler.h> #include <linux/compiler.h>
#include <linux/bitops.h> #include <linux/bitops.h>
#include <linux/log2.h> #include <linux/log2.h>
#include <linux/typecheck.h>
#include <asm/byteorder.h> #include <asm/byteorder.h>
#include <asm/bug.h> #include <asm/bug.h>
@ -441,26 +442,6 @@ static inline char *pack_hex_byte(char *buf, u8 byte)
const typeof( ((type *)0)->member ) *__mptr = (ptr); \ const typeof( ((type *)0)->member ) *__mptr = (ptr); \
(type *)( (char *)__mptr - offsetof(type,member) );}) (type *)( (char *)__mptr - offsetof(type,member) );})
/*
* Check at compile time that something is of a particular type.
* Always evaluates to 1 so you may use it easily in comparisons.
*/
#define typecheck(type,x) \
({ type __dummy; \
typeof(x) __dummy2; \
(void)(&__dummy == &__dummy2); \
1; \
})
/*
* Check at compile time that 'function' is a certain type, or is a pointer
* to that type (needs to use typedef for the function type.)
*/
#define typecheck_fn(type,function) \
({ typeof(type) __tmp = function; \
(void)__tmp; \
})
struct sysinfo; struct sysinfo;
extern int do_sysinfo(struct sysinfo *info); extern int do_sysinfo(struct sysinfo *info);

24
include/linux/typecheck.h Normal file
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@ -0,0 +1,24 @@
#ifndef TYPECHECK_H_INCLUDED
#define TYPECHECK_H_INCLUDED
/*
* Check at compile time that something is of a particular type.
* Always evaluates to 1 so you may use it easily in comparisons.
*/
#define typecheck(type,x) \
({ type __dummy; \
typeof(x) __dummy2; \
(void)(&__dummy == &__dummy2); \
1; \
})
/*
* Check at compile time that 'function' is a certain type, or is a pointer
* to that type (needs to use typedef for the function type.)
*/
#define typecheck_fn(type,function) \
({ typeof(type) __tmp = function; \
(void)__tmp; \
})
#endif /* TYPECHECK_H_INCLUDED */