Commit f12d3ff3 authored by Arnd Bergmann's avatar Arnd Bergmann
Browse files

powerpc: use linux/unaligned/le_struct.h on LE power7 



Little-endian POWER7 kernels disable
CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS because that is not supported on
the hardware, but the kernel still uses direct load/store for explicti
get_unaligned()/put_unaligned().

I assume this is a mistake that leads to power7 having to trap and fix
up all these unaligned accesses at a noticeable performance cost.

The fix is completely trivial, just remove the file and use the
generic version that gets it right.

Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
parent 3aec1db0

arch/powerpc/include/asm/unaligned.h

deleted100644 → 0
+0 −22
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */

#ifndef _ASM_POWERPC_UNALIGNED_H

#define _ASM_POWERPC_UNALIGNED_H



#ifdef __KERNEL__



/*

 * The PowerPC can do unaligned accesses itself based on its endian mode.

 */

#include <linux/unaligned/access_ok.h>

#include <linux/unaligned/generic.h>



#ifdef __LITTLE_ENDIAN__

#define get_unaligned	__get_unaligned_le

#define put_unaligned	__put_unaligned_le

#else

#define get_unaligned	__get_unaligned_be

#define put_unaligned	__put_unaligned_be

#endif



#endif	/* __KERNEL__ */

#endif	/* _ASM_POWERPC_UNALIGNED_H */