Add '__nocast' sparse annotation to allow people to mark places

where implicit casts are not appropriate.

This can be used to mark unsigned integers as being uncastable
to signed, for example. Or enums as not degrading to integers
and vice versa.

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index 73d957f2765d..487725cf0d0d 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -8,6 +8,7 @@
 # define __kernel	/* default address space */
 # define __safe		__attribute__((safe))
 # define __force	__attribute__((force))
+# define __nocast	__attribute__((nocast))
 # define __iomem	__attribute__((noderef, address_space(2)))
 # define __acquires(x)	__attribute__((context(0,1)))
 # define __releases(x)	__attribute__((context(1,0)))
@@ -21,6 +22,7 @@ extern void __chk_io_ptr(void __iomem *);
 # define __kernel
 # define __safe
 # define __force
+# define __nocast
 # define __iomem
 # define __chk_user_ptr(x) (void)0
 # define __chk_io_ptr(x) (void)0