block: disable sysfs parts of the disk command filter

[safe/jmp/linux-2.6] / include / linux / compiler.h

diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index 060b961..c8bd2da 100644 (file)
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -10,13 +10,13 @@
 # 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)))
-# define __acquire(x)  __context__(1)
-# define __release(x)  __context__(-1)
-# define __cond_lock(x)        ((x) ? ({ __context__(1); 1; }) : 0)
-extern void __chk_user_ptr(void __user *);
-extern void __chk_io_ptr(void __iomem *);
+# define __acquires(x) __attribute__((context(x,0,1)))
+# define __releases(x) __attribute__((context(x,1,0)))
+# define __acquire(x)  __context__(x,1)
+# define __release(x)  __context__(x,-1)
+# define __cond_lock(x,c)      ((c) ? ({ __acquire(x); 1; }) : 0)
+extern void __chk_user_ptr(const volatile void __user *);
+extern void __chk_io_ptr(const volatile void __iomem *);
 #else
 # define __user
 # define __kernel
@@ -31,16 +31,14 @@ extern void __chk_io_ptr(void __iomem *);
 # define __releases(x)
 # define __acquire(x) (void)0
 # define __release(x) (void)0
-# define __cond_lock(x) (x)
+# define __cond_lock(x,c) (c)
 #endif
 
 #ifdef __KERNEL__
 
-#if __GNUC__ > 4
-#error no compiler-gcc.h file for this gcc version
-#elif __GNUC__ == 4
+#if __GNUC__ >= 4
 # include <linux/compiler-gcc4.h>
-#elif __GNUC__ == 3
+#elif __GNUC__ == 3 && __GNUC_MINOR__ >= 2
 # include <linux/compiler-gcc3.h>
 #else
 # error Sorry, your compiler is too old/not recognized.
@@ -103,40 +101,49 @@ extern void __chk_io_ptr(void __iomem *);
 #undef __must_check
 #define __must_check
 #endif
+#ifndef CONFIG_ENABLE_WARN_DEPRECATED
+#undef __deprecated
+#undef __deprecated_for_modules
+#define __deprecated
+#define __deprecated_for_modules
+#endif
 
 /*
  * Allow us to avoid 'defined but not used' warnings on functions and data,
  * as well as force them to be emitted to the assembly file.
  *
- * As of gcc 3.3, static functions that are not marked with attribute((used))
- * may be elided from the assembly file.  As of gcc 3.3, static data not so
+ * As of gcc 3.4, static functions that are not marked with attribute((used))
+ * may be elided from the assembly file.  As of gcc 3.4, static data not so
  * marked will not be elided, but this may change in a future gcc version.
  *
+ * NOTE: Because distributions shipped with a backported unit-at-a-time
+ * compiler in gcc 3.3, we must define __used to be __attribute__((used))
+ * for gcc >=3.3 instead of 3.4.
+ *
  * In prior versions of gcc, such functions and data would be emitted, but
  * would be warned about except with attribute((unused)).
+ *
+ * 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__    /* unimplemented */
+#ifndef __used
+# define __used                        /* unimplemented */
 #endif
 
-/*
- * 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.
- * [...]
- */
-#ifndef __attribute_pure__
-# define __attribute_pure__    /* unimplemented */
+#ifndef __maybe_unused
+# define __maybe_unused                /* unimplemented */
 #endif
 
 #ifndef noinline
 #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
@@ -161,4 +168,30 @@ extern void __chk_io_ptr(void __iomem *);
 # define __attribute_const__   /* unimplemented */
 #endif
 
+/*
+ * Tell gcc if a function is cold. The compiler will assume any path
+ * directly leading to the call is unlikely.
+ */
+
+#ifndef __cold
+#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 */