linux-kernel - Re: [PATCH v2 10/30] Add x86-specific parity functions

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Message-ID: <5705DA47.1060902@gmail.com>
Date:	Thu, 7 Apr 2016 11:55:51 +0800
From:	Zeng Zhaoxiu <zhaoxiu.zeng@...il.com>
To:	Borislav Petkov <bp@...e.de>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
Cc:	zengzhaoxiu@....com, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, dvlasenk@...hat.com, akpm@...ux-foundation.org,
	dvyukov@...gle.com, keescook@...omium.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 10/30] Add x86-specific parity functions

在 2016年04月06日 18:53, Borislav Petkov 写道:
> On Wed, Apr 06, 2016 at 11:37:37AM +0100, One Thousand Gnomes wrote:
>> Even that would still be wrong for the smaller parity values. The CPU
>> supports 8bit parity directly going back to the 8086 so the
>> implementation for 8bit and I think 16bit is still wrong.
> I was objecting to the unnecessary replication of the hweight/popcnt
> glue.
>
> And yes, one could look up the definition of the parity flag on x86 and
> then base the implementation of all those smaller ones on that as the
> hardware does it for one practically for free there.
>
> :-)
>

SETcc (SETPO etc.) added since 80386, is this a problem?