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Message-Id: <20220624105612.137575-1-abbotti@mev.co.uk>
Date: Fri, 24 Jun 2022 11:56:12 +0100
From: Ian Abbott <abbotti@....co.uk>
To: linux-kernel@...r.kernel.org
Cc: Ian Abbott <abbotti@....co.uk>
Subject: [RESEND PATCH] typecheck.h: Force a compilation error if typecheck(type,x) fails
Calling the `typecheck(type,x)` macro emits a compiler warning if the
type of `x` is incompatible with type `type`. Change it to force a
compilation error instead.
Signed-off-by: Ian Abbott <abbotti@....co.uk>
---
include/linux/typecheck.h | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/include/linux/typecheck.h b/include/linux/typecheck.h
index 46b15e2aaefb..c9125304f6ba 100644
--- a/include/linux/typecheck.h
+++ b/include/linux/typecheck.h
@@ -2,14 +2,15 @@
#ifndef TYPECHECK_H_INCLUDED
#define TYPECHECK_H_INCLUDED
+#include <linux/compiler_types.h>
+#include <linux/build_bug.h>
+
/*
* 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); \
+({ BUILD_BUG_ON(!__same_type(type, (x))); \
1; \
})
--
2.35.1
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