From ff90af6c73883121358251bba66245ff4da3755c Mon Sep 17 00:00:00 2001 From: Masahiro Yamada Date: Wed, 28 Dec 2016 00:36:01 +0900 Subject: [PATCH] typecheck: import include/linux/typecheck.h from Linux 4.9 Copied from Linux 4.9. Signed-off-by: Masahiro Yamada --- include/linux/typecheck.h | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) create mode 100644 include/linux/typecheck.h diff --git a/include/linux/typecheck.h b/include/linux/typecheck.h new file mode 100644 index 0000000000..eb5b74a575 --- /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 */ -- 2.39.5