From: Rusty Russell <rusty@rustcorp.com.au>
To: linux-kernel@vger.kernel.org
Cc: Andrew Morton <akpm@linux-foundation.org>
Subject: [PATCH 3/5] module_param: add __same_type convenience wrapper for __builtin_types_compatible_p
Date: Sat, 28 Mar 2009 23:53:44 +1030 [thread overview]
Message-ID: <200903282353.45114.rusty@rustcorp.com.au> (raw)
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@rustcorp.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(),
reply other threads:[~2009-03-28 13:24 UTC|newest]
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