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asm-generic: allow generic unaligned access if the arch supports it

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Switch the default unaligned access method to 'hardware implemented'
if HAVE_EFFICIENT_UNALIGNED_ACCESS is set.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Ard Biesheuvel 2014-05-01 17:49:33 +02:00
parent c9eaa447e7
commit 0567f5facb
1 changed files with 13 additions and 8 deletions
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21
include/asm-generic/unaligned.h
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@ -4,22 +4,27 @@
/*
* This is the most generic implementation of unaligned accesses
* and should work almost anywhere.
*
* If an architecture can handle unaligned accesses in hardware,
* it may want to use the linux/unaligned/access_ok.h implementation
* instead.
*/
#include <asm/byteorder.h>
/* Set by the arch if it can handle unaligned accesses in hardware. */
#ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
# include <linux/unaligned/access_ok.h>
#endif
#if defined(__LITTLE_ENDIAN)
# include <linux/unaligned/le_struct.h>
# include <linux/unaligned/be_byteshift.h>
# ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
# include <linux/unaligned/le_struct.h>
# include <linux/unaligned/be_byteshift.h>
# endif
# include <linux/unaligned/generic.h>
# define get_unaligned __get_unaligned_le
# define put_unaligned __put_unaligned_le
#elif defined(__BIG_ENDIAN)
# include <linux/unaligned/be_struct.h>
# include <linux/unaligned/le_byteshift.h>
# ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
# include <linux/unaligned/be_struct.h>
# include <linux/unaligned/le_byteshift.h>
# endif
# include <linux/unaligned/generic.h>
# define get_unaligned __get_unaligned_be
# define put_unaligned __put_unaligned_be