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Message-Id: <20100709225816.884268032@efficios.com>
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Date: Fri, 09 Jul 2010 18:57:36 -0400
From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
To: Steven Rostedt <rostedt@goodmis.org>, LKML <linux-kernel@vger.kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@elte.hu>,
       Frederic Weisbecker <fweisbec@gmail.com>,
       Thomas Gleixner <tglx@linutronix.de>, Christoph Hellwig <hch@lst.de>,
       Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
       Li Zefan <lizf@cn.fujitsu.com>, Lai Jiangshan <laijs@cn.fujitsu.com>,
       Johannes Berg <johannes.berg@intel.com>,
       Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
       Arnaldo Carvalho de Melo <acme@infradead.org>,
       Tom Zanussi <tzanussi@gmail.com>,
       KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
       Andi Kleen <andi@firstfloor.org>
Subject: [patch 09/20] x86 inline memcpy
References: <20100709225727.312232266@efficios.com>
Content-Disposition: inline; filename=x86-inline-memcpy.patch
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Export an inline_memcpy() API. Useful when the memcpy size is unknown but the
caller cannot afford the cost of a function call. Useful for very frequent
memcpy callers.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---
 arch/x86/include/asm/string_32.h |    7 +++++++
 arch/x86/include/asm/string_64.h |    7 +++++++
 2 files changed, 14 insertions(+)

Index: linux.trees.git/arch/x86/include/asm/string_32.h
===================================================================
--- linux.trees.git.orig/arch/x86/include/asm/string_32.h	2010-06-21 17:50:21.000000000 -0400
+++ linux.trees.git/arch/x86/include/asm/string_32.h	2010-06-21 17:56:49.000000000 -0400
@@ -44,6 +44,13 @@ static __always_inline void *__memcpy(vo
 	return to;
 }
 
+#define __HAVE_ARCH_INLINE_MEMCPY
+static __always_inline void *inline_memcpy(void *to, const void *from,
+					   size_t n)
+{
+	return __memcpy(to, from, n);
+}
+
 /*
  * This looks ugly, but the compiler can optimize it totally,
  * as the count is constant.
Index: linux.trees.git/arch/x86/include/asm/string_64.h
===================================================================
--- linux.trees.git.orig/arch/x86/include/asm/string_64.h	2010-06-21 17:50:21.000000000 -0400
+++ linux.trees.git/arch/x86/include/asm/string_64.h	2010-06-21 17:57:13.000000000 -0400
@@ -23,6 +23,13 @@ static __always_inline void *__inline_me
 	return to;
 }
 
+#define __HAVE_ARCH_INLINE_MEMCPY
+static __always_inline void *inline_memcpy(void *to, const void *from,
+					   size_t n)
+{
+	return __inline_memcpy(to, from, n);
+}
+
 /* Even with __builtin_ the compiler may decide to use the out of line
    function. */