linux-kernel - Re: [PATCH V3 01/29] bitops: add parity functions

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Date:	Mon, 25 Apr 2016 17:14:11 +0800
From:	Zeng Zhaoxiu <zhaoxiu.zeng@...il.com>
To:	George Spelvin <linux@...izon.com>, linux-kernel@...r.kernel.org,
	zengzhaoxiu@....com
Cc:	akpm@...ux-foundation.org, arnd@...db.de, dvlasenk@...hat.com,
	linux-arch@...r.kernel.org, martink@...teo.de, mingo@...nel.org,
	sasha.levin@...cle.com, yury.norov@...il.com
Subject: Re: [PATCH V3 01/29] bitops: add parity functions

在 2016年04月20日 02:45, George Spelvin 写道:
>> Add generic odd parity functions, adapted from
>> "https://graphics.stanford.edu/~seander/bithacks.html#ParityParallel"
> Given a PARITY_MAGIC of 0x6996, this is even parity, not odd.
>
> (Which it should be; an XOR of all bits is the "natural" form.)

 From "http://www.encyclopedia.com/doc/1O11-oddparity.html", we can get
the definition of "odd parity":

odd parity A property that holds when a group of binary values contains an odd number of 1s.