linux-kernel - Re: [GIT PULL] x86 fixes for 2.6.30-rc8

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Message-Id: <200905300713.23741.lkml@morethan.org>
Date:	Sat, 30 May 2009 07:13:21 -0500
From:	"Michael S. Zick" <lkml@...ethan.org>
To:	Pavel Machek <pavel@....cz>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	"Thomas Gleixner <tglx@...utronix.de> Suresh Siddha" 
	<suresh.siddha@...el.com>, Tejun Heo <tj@...nel.org>,
	Venkatesh Pallapadi <venkatesh.pallapadi@...el.com>,
	Zhang Rui <rui.zhang@...el.com>
Subject: Re: [GIT PULL] x86 fixes for 2.6.30-rc8

On Sat May 30 2009, Pavel Machek wrote:
> Hi!
> 
> > --- a/Documentation/kernel-parameters.txt
> > +++ b/Documentation/kernel-parameters.txt
> > @@ -1535,6 +1535,10 @@ and is between 256 and 4096 characters. It is defined in the file
> >  			register save and restore. The kernel will only save
> >  			legacy floating-point registers on task switch.
> >  
> > +	noxsave		[BUGS=X86] Disables x86 extended register state save
> > +			and restore using xsave. The kernel will fallback to
> > +			enabling legacy floating-point and sse state.
> > +
> 
> Does that mean apps using sse8 will see their registers corrupted if
> this option is used? Or are new registers sets always added in a way
> that kernel has to enable them first?
> 

Has this change been tested on the processors that have independent ftp&sse
units, without the shared registers?  Such as the VIA C7-M?

Mike
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