arm64: use generic strnlen_user and strncpy_from_user functions

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This patch implements the word-at-a-time interface for arm64 using the
same algorithm as ARM. We use the fls64 macro, which expands to a clz
instruction via a compiler builtin. Big-endian configurations make use
of the implementation from asm-generic.

With this implemented, we can replace our byte-at-a-time strnlen_user
and strncpy_from_user functions with the optimised generic versions.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Will Deacon 2013-11-06 17:20:22 +00:00 • committed by Catalin Marinas

parent 7158627686

commit 12a0ef7b0a

7 changed files with 64 additions and 127 deletions

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2

arch/arm64/Kconfig

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25

arch/arm64/include/asm/uaccess.h

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arch/arm64/include/asm/word-at-a-time.h

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arch/arm64/kernel/arm64ksyms.c

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arch/arm64/lib/Makefile

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arch/arm64/lib/strncpy_from_user.S

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arch/arm64/lib/strnlen_user.S

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