linux-kernel - Re: [patch 0/9] x86, xsave: xsave/xrstor support

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Date:	Wed, 30 Jul 2008 20:25:39 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Suresh Siddha <suresh.b.siddha@...el.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"arjan@...ux.intel.com" <arjan@...ux.intel.com>,
	"roland@...hat.com" <roland@...hat.com>,
	"drepper@...hat.com" <drepper@...hat.com>,
	"mikpe@...uu.se" <mikpe@...uu.se>,
	"chrisw@...s-sol.org" <chrisw@...s-sol.org>,
	"andi@...stfloor.org" <andi@...stfloor.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [patch 0/9] x86, xsave: xsave/xrstor support


* Ingo Molnar <mingo@...e.hu> wrote:

> Well, in this case the conflicts seem to be quite heavy, so i'd 
> suggest to use the method we have used for x86/x2apic and for 
> xen-64bit:
> 
> Merge the affected topics into tip/x86/core. Then merge x86/core into 
> x86/xsave, and put the xsave patches ontop of that base.
> 
> This way x86/xsave is a 'derived' topic and optional until it's 
> proven, but one that is still mergable once all the dependent topics 
> go upstream. We'd only have to rebase it in the (unlikely) event of 
> there being some major problem with any of the topics merged into 
> x86/core.

I've restructured tip/x86/xsave to be like this, and it can now be 
merged into tip/master without conficts.

I briefly merged it into tip/master to test it, but after about 10 
randconfig iterations it ran into a spontaneous reboot crash. There's 
nothing in the log, the box (an Athlon64 X2) just reboots spontaneously. 
Removing the x86/xsave changes makes the system boot up fine.

I've pushed out the tree i tested into the tip/tmp.x86/xsave.broken 
branch. The bad config is:

  http://redhat.com/~mingo/misc/config-Wed_Jul_30_20_09_12_CEST_2008.bad

Two crashlogs are here:

  http://redhat.com/~mingo/misc/crash-Wed_Jul_30_20_09_12_CEST_2008.log

the serial log just stops at a certain point. It's not at a specific 
point, but the crash happened both times i tried to boot it.

	Ingo
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