From: Will Deacon <will.deacon@arm.com>
Date: Thu, 12 Dec 2013 17:40:22 +0000 (+0000)
Subject: word-at-a-time: provide generic big-endian zero_bytemask implementation
X-Git-Tag: v3.13-rc4~28
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=11ec50caedb56e3a87715edeff6a1852e6ae5416;p=pandora-kernel.git

word-at-a-time: provide generic big-endian zero_bytemask implementation

Whilst architectures may be able to do better than this (which they can,
by simply defining their own macro), this is a generic stab at a
zero_bytemask implementation for the asm-generic, big-endian
word-at-a-time implementation.

On arm64, a clz instruction is used to implement the fls efficiently.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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