[PATCH 4.9 51/77] compiler-gcc.h: Introduce __optimize function attribute

From: Greg Kroah-Hartman
Date: Wed Feb 21 2018 - 09:25:36 EST


4.9-stable review patch. If anyone has any objections, please let me know.

------------------

From: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>

commit df5d45aa08f848b79caf395211b222790534ccc7 upstream.

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>
Acked-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
include/linux/compiler-gcc.h | 4 ++++
include/linux/compiler.h | 4 ++++
2 files changed, 8 insertions(+)

--- a/include/linux/compiler-gcc.h
+++ b/include/linux/compiler-gcc.h
@@ -187,6 +187,10 @@
#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__
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -469,6 +469,10 @@ static __always_inline void __write_once
# define __native_word(t) (sizeof(t) == sizeof(char) || sizeof(t) == sizeof(short) || sizeof(t) == sizeof(int) || sizeof(t) == sizeof(long))
#endif

+#ifndef __optimize
+# define __optimize(level)
+#endif
+
/* Compile time object size, -1 for unknown */
#ifndef __compiletime_object_size
# define __compiletime_object_size(obj) -1