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
next reply other threads:[~2018-02-01 10:22 UTC|newest]
Thread overview: 8+ 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 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
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