[PATCH 4.15 042/163] compiler-gcc.h: Introduce __optimize function attribute

Greg Kroah-Hartman
2018-02-21T12:47:51Z

From: Geert Uytterhoeven <geert@linux-m68k.org>

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@linux-m68k.org>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
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
@@ -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__
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -271,6 +271,10 @@ static __always_inline void __write_once

#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