From: Will Deacon <will.deacon@arm.com>
Date: Fri, 6 Jul 2012 14:45:39 +0000 (+0100)
Subject: ARM: 7449/1: use generic strnlen_user and strncpy_from_user functions
X-Git-Tag: v3.6-rc1~70^2^5~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8c56cc8be5b38e3684eba96dc9b3f7ca7e495755;p=pandora-kernel.git

ARM: 7449/1: use generic strnlen_user and strncpy_from_user functions

This patch implements the word-at-a-time interface for ARM using the
same algorithm as x86. We use the fls macro from ARMv5 onwards, where
we have a clz instruction available which saves us a mov instruction
when targetting Thumb-2. For older CPUs, we use the magic 0x0ff0001
constant. 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.

Reviewed-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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