[RFC PATCH 09/20] x86: inline memcpy

[Mathieu Desnoyers]

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@xxxxxxxxxxxx>
---
 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. */
 

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/