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-rw-r--r--include/linux/const.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/const.h b/include/linux/const.h
index 07b300bfe34b..c22c707c455d 100644
--- a/include/linux/const.h
+++ b/include/linux/const.h
@@ -7,13 +7,18 @@
* C code. Therefore we cannot annotate them always with
* 'UL' and other type specifiers unilaterally. We
* use the following macros to deal with this.
+ *
+ * Similarly, _AT() will cast an expression with a type in C, but
+ * leave it unchanged in asm.
*/
#ifdef __ASSEMBLY__
#define _AC(X,Y) X
+#define _AT(T,X) X
#else
#define __AC(X,Y) (X##Y)
#define _AC(X,Y) __AC(X,Y)
+#define _AT(T,X) ((T)(X))
#endif
#endif /* !(_LINUX_CONST_H) */