[PATCH 1/2] Compiler Attributes: naked was fixed in gcc 4.6

From: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org,
	Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>,
	Stefan Agner <stefan@agner.ch>,
	Rasmus Villemoes <linux@rasmusvillemoes.dk>,
	Eli Friedman <efriedma@codeaurora.org>,
	Christopher Li <sparse@chrisli.org>,
	Kees Cook <keescook@chromium.org>, Ingo Molnar <mingo@kernel.org>,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	Arnd Bergmann <arnd@arndb.de>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Masahiro Yamada <yamada.masahiro@socionext.com>,
	Joe Perches <joe@perches.com>,
	Dominique Martinet <asmadeus@codewreck.org>,
	linux-sparse@vger.kernel.org
Subject: [PATCH 1/2] Compiler Attributes: naked was fixed in gcc 4.6
Date: Fri, 14 Sep 2018 01:59:40 +0200	[thread overview]
Message-ID: <20180913235941.31211-2-miguel.ojeda.sandonis@gmail.com> (raw)
In-Reply-To: <20180913235941.31211-1-miguel.ojeda.sandonis@gmail.com>

Commit 9c695203a7dd ("compiler-gcc.h: gcc-4.5 needs noclone
and noinline on __naked functions") added noinline and noclone
as a workaround for a gcc 4.5 bug, which was resolved in 4.6.0.

Since now the minimum gcc supported version is 4.6,
we can clean it up.

See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=44290
and https://godbolt.org/z/h6NMIL

Cc: Stefan Agner <stefan@agner.ch>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Eli Friedman <efriedma@codeaurora.org>
Cc: Christopher Li <sparse@chrisli.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Joe Perches <joe@perches.com>
Cc: Dominique Martinet <asmadeus@codewreck.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-sparse@vger.kernel.org
Reviewed-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
---
 include/linux/compiler-gcc.h | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
index 763bbad1e258..25d3dd6b2702 100644
--- a/include/linux/compiler-gcc.h
+++ b/include/linux/compiler-gcc.h
@@ -84,14 +84,8 @@
  * to trace naked functions because then mcount is called without
  * stack and frame pointer being set up and there is no chance to
  * restore the lr register to the value before mcount was called.
- *
- * The asm() bodies of naked functions often depend on standard calling
- * conventions, therefore they must be noinline and noclone.
- *
- * GCC 4.[56] currently fail to enforce this, so we must do so ourselves.
- * See GCC PR44290.
  */
-#define __naked		__attribute__((naked)) noinline __noclone notrace
+#define __naked		__attribute__((naked)) notrace
 
 #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
 
-- 
2.17.1

