All of lore.kernel.org
 help / color / mirror / Atom feed
From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Herbert Xu <herbert@gondor.apana.org.au>,
	"David S . Miller" <davem@davemloft.net>,
	Christopher Li <sparse@chrisli.org>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Tom Lendacky <thomas.lendacky@amd.com>
Cc: Arnd Bergmann <arnd@arndb.de>,
	Andrew Morton <akpm@linux-foundation.org>,
	linux-crypto@vger.kernel.org, linux-sparse@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	Geert Uytterhoeven <geert@linux-m68k.org>
Subject: [PATCH 1/3] compiler-gcc.h: Introduce __optimize function attribute
Date: Thu,  1 Feb 2018 11:21:58 +0100	[thread overview]
Message-ID: <1517480520-4465-1-git-send-email-geert@linux-m68k.org> (raw)

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>
---
I assume this is supported as of gcc-4.4:
  - gcc version 4.3.3 (GCC): warning: ‘__optimize__’ 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

             reply	other threads:[~2018-02-01 10:22 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-02-01 10:21 Geert Uytterhoeven [this message]
2018-02-01 10:21 ` [PATCH 2/3] compiler-gcc.h: __nostackprotector needs gcc-4.4 and up Geert Uytterhoeven
2018-02-01 11:46   ` Arnd Bergmann
2018-02-01 11:55     ` Geert Uytterhoeven
2018-02-01 11:55       ` Geert Uytterhoeven
2018-02-01 15:29       ` Arnd Bergmann
2018-02-01 10:22 ` [PATCH 3/3] crypto: sha3-generic - Use __optimize to support old compilers Geert Uytterhoeven
2018-02-01 17:30   ` Ard Biesheuvel
2018-02-01 17:30 ` [PATCH 1/3] compiler-gcc.h: Introduce __optimize function attribute Ard Biesheuvel

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1517480520-4465-1-git-send-email-geert@linux-m68k.org \
    --to=geert@linux-m68k.org \
    --cc=akpm@linux-foundation.org \
    --cc=ard.biesheuvel@linaro.org \
    --cc=arnd@arndb.de \
    --cc=davem@davemloft.net \
    --cc=herbert@gondor.apana.org.au \
    --cc=linux-crypto@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-sparse@vger.kernel.org \
    --cc=sparse@chrisli.org \
    --cc=thomas.lendacky@amd.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.