This is a note to let you know that I've just added the patch titled

compiler-gcc.h: Introduce __optimize function attribute

to the 4.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: compiler-gcc.h-introduce-__optimize-function-attribute.patch and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From df5d45aa08f848b79caf395211b222790534ccc7 Mon Sep 17 00:00:00 2001

From: Geert Uytterhoeven geert@linux-m68k.org Date: Thu, 1 Feb 2018 11:21:58 +0100 Subject: compiler-gcc.h: Introduce __optimize function attribute

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

Patches currently in stable-queue which might be from geert@linux-m68k.org are

queue-4.15/compiler-gcc.h-__nostackprotector-needs-gcc-4.4-and-up.patch queue-4.15/compiler-gcc.h-introduce-__optimize-function-attribute.patch