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

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Message-ID: <20160415021102.GB2700@cz.tnic>
Date:	Fri, 15 Apr 2016 04:11:02 +0200
From:	Borislav Petkov <bp@...e.de>
To:	Zeng Zhaoxiu <zhaoxiu.zeng@...il.com>
Cc:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	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

On Mon, Apr 11, 2016 at 10:43:32AM +0800, Zeng Zhaoxiu wrote:
> I don't know where the errors. X86 is new to me.

Ok, let me try again by pasting here the relevant text from the manual:

"Parity Flag (PF). Bit 2. Hardware sets the parity flag to 1 if there
is an even number of 1 bits in the least-significant byte of the last
result of certain operations. Otherwise (i.e., for an odd number of 1
bits), hardware clears the flag to 0. Software can read the flag to
implement parity checking."

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--