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authorJiri Kosina <jkosina@suse.cz>2012-10-28 19:28:52 +0100
committerJiri Kosina <jkosina@suse.cz>2012-10-28 19:29:19 +0100
commit3bd7bf1f0fe14f591c089ae61bbfa9bd356f178a (patch)
tree0058693cc9e70b7461dae551f8a19aff2efd13ca /include/uapi/linux/const.h
parentf16f84937d769c893492160b1a8c3672e3992beb (diff)
parente657e078d3dfa9f96976db7a2b5fd7d7c9f1f1a6 (diff)
Merge branch 'master' into for-next
Sync up with Linus' tree to be able to apply Cesar's patch against newer version of the code. Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'include/uapi/linux/const.h')
-rw-r--r--include/uapi/linux/const.h24
1 files changed, 24 insertions, 0 deletions
diff --git a/include/uapi/linux/const.h b/include/uapi/linux/const.h
new file mode 100644
index 00000000000..c22c707c455
--- /dev/null
+++ b/include/uapi/linux/const.h
@@ -0,0 +1,24 @@
+/* const.h: Macros for dealing with constants. */
+
+#ifndef _LINUX_CONST_H
+#define _LINUX_CONST_H
+
+/* Some constant macros are used in both assembler and
+ * 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) */