[PATCH 1/3] compiler-gcc.h: Introduce __optimize function attribute

[Geert Uytterhoeven]

Create a new function attribute __optimize, which allows to specify an
optimization level on a per-function basis.

Signed-off-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
---
I assume this is supported as of gcc-4.4:
  - gcc version 4.3.3 (GCC): warning: â__optimize__â attribute directive
    ignored
  - gcc version 4.4.7 (Ubuntu/Linaro 4.4.7-1ubuntu2): OK
---
 include/linux/compiler-gcc.h | 4 ++++
 include/linux/compiler.h     | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
index 631354acfa720475..0a278a527944ad2f 100644
--- a/include/linux/compiler-gcc.h
+++ b/include/linux/compiler-gcc.h
@@ -196,6 +196,10 @@
 #endif /* __CHECKER__ */
 #endif /* GCC_VERSION >= 40300 */
 
+#if GCC_VERSION >= 40400
+#define __optimize(level)	__attribute__((__optimize__(level)))
+#endif /* GCC_VERSION >= 40400 */
+
 #if GCC_VERSION >= 40500
 
 #ifndef __CHECKER__
diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index 52e611ab9a6cf6fd..5ff818e9a836e898 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -271,6 +271,10 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s
 
 #endif /* __ASSEMBLY__ */
 
+#ifndef __optimize
+# define __optimize(level)
+#endif
+
 /* Compile time object size, -1 for unknown */
 #ifndef __compiletime_object_size
 # define __compiletime_object_size(obj) -1
-- 
2.7.4