X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=include%2Flinux%2Fcompiler-gcc.h;h=fe23792f05c1077149718fd783458e8d4d12c5db;hb=9732b6112343df2872518ec6701c8ef729310a05;hp=03ec2311fb29c9ce4d252e2e9b41b8eea19e8e18;hpb=ba7cc09c9c9e29a57045dc5bbf843ac1cfad3283;p=linux-2.6-omap-h63xx.git

diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
index 03ec2311fb2..fe23792f05c 100644
--- a/include/linux/compiler-gcc.h
+++ b/include/linux/compiler-gcc.h
@@ -1,4 +1,6 @@
-/* Never include this file directly.  Include <linux/compiler.h> instead.  */
+#ifndef __LINUX_COMPILER_H
+#error "Please don't include <linux/compiler-gcc.h> directly, include <linux/compiler.h> instead."
+#endif
 
 /*
  * Common definitions for all gcc versions go here.
@@ -34,10 +36,20 @@
 #define __weak				__attribute__((weak))
 #define __naked				__attribute__((naked))
 #define __noreturn			__attribute__((noreturn))
+
+/*
+ * From the GCC manual:
+ *
+ * Many functions have no effects except the return value and their
+ * return value depends only on the parameters and/or global
+ * variables.  Such a function can be subject to common subexpression
+ * elimination and loop optimization just as an arithmetic operator
+ * would be.
+ * [...]
+ */
 #define __pure				__attribute__((pure))
 #define __aligned(x)			__attribute__((aligned(x)))
 #define __printf(a,b)			__attribute__((format(printf,a,b)))
 #define  noinline			__attribute__((noinline))
-#define __attribute_pure__		__attribute__((pure))
 #define __attribute_const__		__attribute__((__const__))
 #define __maybe_unused			__attribute__((unused))