linux-kernel - Re: Re[2]: [PATCH] fork_init: fix division by zero

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Message-ID: <18752.14748.408940.386056@cargo.ozlabs.ibm.com>
Date:	Thu, 11 Dec 2008 08:50:20 +1100
From:	Paul Mackerras <paulus@...ba.org>
To:	David Howells <dhowells@...hat.com>
Cc:	Yuri Tikhonov <yur@...raft.com>, Al Viro <viro@...IV.linux.org.uk>,
	Wolfgang Denk <wd@...x.de>, Detlev Zundel <dzu@...x.de>,
	linux-kernel@...r.kernel.org, Milton Miller <miltonm@....com>,
	linuxppc-dev@...abs.org,
	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>,
	Ilya Yanok <yanok@...raft.com>
Subject: Re: Re[2]: [PATCH] fork_init: fix division by zero

David Howells writes:

> Ummm...  On powerpc, I believe rotate-left would be a division as it does the
> bit-numbering and the bit direction the opposite way to more familiar CPUs
> such as x86.

No.  :)

"Left" and "right" are relative to the way those of us humans in the
Western European cultural tradition write numbers, which is
big-endian.  So rotate-left always moves bits towards the more
significant end of the word.

Paul.
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