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[3/5] typecheck: import include/linux/typecheck.h from Linux 4.9

Message ID 1482216812-18379-4-git-send-email-yamada.masahiro@socionext.com
State Superseded
Headers show

Commit Message

Masahiro Yamada Dec. 20, 2016, 6:53 a.m. UTC 
Copied from Linux 4.9.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

---

 include/linux/typecheck.h | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 include/linux/typecheck.h

-- 
2.7.4

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Patch

diff --git a/include/linux/typecheck.h b/include/linux/typecheck.h
new file mode 100644
index 0000000..eb5b74a
--- /dev/null
+++ b/include/linux/typecheck.h
@@ -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 */