linux-kernel - [PATCH 3/5] module_param: add __same_type convenience wrapper for __builtin_types_compatible

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Date:	Sat, 28 Mar 2009 23:53:44 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	linux-kernel@...r.kernel.org
Cc:	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH 3/5] module_param: add __same_type convenience wrapper for __builtin_types_compatible_p


Impact: new API

__builtin_types_compatible_p() is a little awkward to use: it takes two
types rather than types or variables, and it's just damn long.

(typeof(type) == type, so this works on types as well as vars).

Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
---
 include/linux/compiler.h |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/compiler.h b/include/linux/compiler.h
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -260,6 +260,11 @@ void ftrace_likely_update(struct ftrace_
 # define __section(S) __attribute__ ((__section__(#S)))
 #endif
 
+/* Are two types/vars the same type (ignoring qualifiers)? */
+#ifndef __same_type
+# define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
+#endif
+
 /*
  * Prevent the compiler from merging or refetching accesses.  The compiler
  * is also forbidden from reordering successive instances of ACCESS_ONCE(),

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