tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
asm-generic: allow generic unaligned access if the arch supports it
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>
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include/asm-generic/unaligned.h
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include/asm-generic/unaligned.h
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/*
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* This is the most generic implementation of unaligned accesses
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* and should work almost anywhere.
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*
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* If an architecture can handle unaligned accesses in hardware,
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* it may want to use the linux/unaligned/access_ok.h implementation
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* instead.
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*/
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#include <asm/byteorder.h>
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/* Set by the arch if it can handle unaligned accesses in hardware. */
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#ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
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# include <linux/unaligned/access_ok.h>
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#endif
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#if defined(__LITTLE_ENDIAN)
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# include <linux/unaligned/le_struct.h>
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# include <linux/unaligned/be_byteshift.h>
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# ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
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# include <linux/unaligned/le_struct.h>
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# include <linux/unaligned/be_byteshift.h>
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# endif
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# include <linux/unaligned/generic.h>
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# define get_unaligned __get_unaligned_le
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# define put_unaligned __put_unaligned_le
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#elif defined(__BIG_ENDIAN)
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# include <linux/unaligned/be_struct.h>
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# include <linux/unaligned/le_byteshift.h>
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# ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
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# include <linux/unaligned/be_struct.h>
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# include <linux/unaligned/le_byteshift.h>
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# endif
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# include <linux/unaligned/generic.h>
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# define get_unaligned __get_unaligned_be
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# define put_unaligned __put_unaligned_be