From: Chuck Ebbert <76306.1226@compuserve.com>

Add typecheck_fn(type, function) to do type-checking of function
pointers.

Modified-by: Ingo Molnar <mingo@elte.hu>

(made it typeof() based, instead of typedef based.)

Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 include/linux/kernel.h |    9 +++++++++
 1 files changed, 9 insertions(+)

diff -puN include/linux/kernel.h~mutex-subsystem-add-typecheck_fntype-function include/linux/kernel.h
--- 25/include/linux/kernel.h~mutex-subsystem-add-typecheck_fntype-function	Fri Jan  6 17:04:38 2006
+++ 25-akpm/include/linux/kernel.h	Fri Jan  6 17:04:38 2006
@@ -288,6 +288,15 @@ extern void dump_stack(void);
 	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 /* __KERNEL__ */
 
 #define SI_LOAD_SHIFT	16
_