X-Git-Url: http://pilppa.org/gitweb/?a=blobdiff_plain;f=include%2Flinux%2Fcompiler.h;h=c8bd2daf95ec51e0f42ad05e6b8c13be1300ce16;hb=57312b75aa06b09c28acd9c5a9c70827da3696d2;hp=c68b67b86ef1d5cccbed6f7f76f5a94c5a692c80;hpb=2c7505570353af02e48c58ab4d109edd9bbbdd81;p=linux-2.6-omap-h63xx.git

diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index c68b67b86ef..c8bd2daf95e 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -126,10 +126,6 @@ extern void __chk_io_ptr(const volatile void __iomem *);
  * Mark functions that are referenced only in inline assembly as __used so
  * the code is emitted even though it appears to be unreferenced.
  */
-#ifndef __attribute_used__
-# define __attribute_used__	/* deprecated */
-#endif
-
 #ifndef __used
 # define __used			/* unimplemented */
 #endif
@@ -142,6 +138,12 @@ extern void __chk_io_ptr(const volatile void __iomem *);
 #define noinline
 #endif
 
+/*
+ * Rather then using noinline to prevent stack consumption, use
+ * noinline_for_stack instead.  For documentaiton reasons.
+ */
+#define noinline_for_stack noinline
+
 #ifndef __always_inline
 #define __always_inline inline
 #endif
@@ -175,4 +177,21 @@ extern void __chk_io_ptr(const volatile void __iomem *);
 #define __cold
 #endif
 
+/* Simple shorthand for a section definition */
+#ifndef __section
+# define __section(S) __attribute__ ((__section__(#S)))
+#endif
+
+/*
+ * Prevent the compiler from merging or refetching accesses.  The compiler
+ * is also forbidden from reordering successive instances of ACCESS_ONCE(),
+ * but only when the compiler is aware of some particular ordering.  One way
+ * to make the compiler aware of ordering is to put the two invocations of
+ * ACCESS_ONCE() in different C statements.
+ *
+ * This macro does absolutely -nothing- to prevent the CPU from reordering,
+ * merging, or refetching absolutely anything at any time.
+ */
+#define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x))
+
 #endif /* __LINUX_COMPILER_H */