linux-kernel - [PATCH] x86, efi: Fix processor-specific memcpy() build error

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Date:	Thu, 22 Mar 2012 10:18:54 +0000
From:	Matt Fleming <matt@...sole-pimps.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Al Viro <viro@...iv.linux.org.uk>, x86@...nel.org,
	linux-kernel@...r.kernel.org, Matt Fleming <matt.fleming@...el.com>
Subject: [PATCH] x86, efi: Fix processor-specific memcpy() build error

From: Matt Fleming <matt.fleming@...el.com>

Building for Athlon/Duron/K7 results in the following build error,

arch/x86/boot/compressed/eboot.o: In function `__constant_memcpy3d':
eboot.c:(.text+0x385): undefined reference to `_mmx_memcpy'
arch/x86/boot/compressed/eboot.o: In function `efi_main':
eboot.c:(.text+0x1a22): undefined reference to `_mmx_memcpy'

because the boot stub code doesn't link with the kernel proper, and
therefore doesn't have access to the 3DNow version of memcpy. So,
follow the example of misc.c and #undef memcpy so that we use the
version provided by misc.c.

Reported-by: Al Viro <viro@...iv.linux.org.uk>
Cc: H. Peter Anvin <hpa@...or.com>
Signed-off-by: Matt Fleming <matt.fleming@...el.com>
---
 arch/x86/boot/compressed/eboot.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c
index fec216f..3481574 100644
--- a/arch/x86/boot/compressed/eboot.c
+++ b/arch/x86/boot/compressed/eboot.c
@@ -14,6 +14,8 @@
 
 #include "eboot.h"
 
+#undef memcpy			/* Use memcpy from misc.c */
+
 static efi_system_table_t *sys_table;
 
 static efi_status_t __get_map(efi_memory_desc_t **map, unsigned long *map_size,
-- 
1.7.4.4

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