linux-kernel - Re: Kernel oops with 2.6.26, padlock and ipsec: probably problem with fpu state changes

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Message-ID: <20080811192203.GC12788@elte.hu>
Date:	Mon, 11 Aug 2008 21:22:03 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	"H. Peter Anvin" <hpa@...or.com>,
	Wolfgang Walter <wolfgang.walter@...m.de>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"viro@...IV.linux.org.uk" <viro@...iv.linux.org.uk>,
	"vegard.nossum@...il.com" <vegard.nossum@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: Kernel oops with 2.6.26, padlock and ipsec: probably problem
	with fpu state changes


* Suresh Siddha <suresh.b.siddha@...el.com> wrote:

> Reported-and-bisected-by: Wolfgang Walter <wolfgang.walter@...m.de>
> Signed-off-by: Suresh Siddha <suresh.b.siddha@...el.com>

no fundamental objection to the x86 bits.

shouldnt this:

+       if (!in_interrupt())
+               return 0;

just be eliminated and the cr0/TS save/restore be made unconditional?  
irq-assymetric APIs are not nice in general.

Reading/setting cr0 isnt _that_ slow. (or if it is, by how much does it 
slow things down, exactly?)

	Ingo
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