linux-kernel - Re: [patch 1/2] x86, fpu: split FPU state from task struct

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Message-ID: <20080311083517.GC25110@elte.hu>
Date:	Tue, 11 Mar 2008 09:35:17 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	Suresh Siddha <suresh.b.siddha@...el.com>, hpa@...or.com,
	tglx@...utronix.de, andi@...stfloor.org, hch@...radead.org,
	linux-kernel@...r.kernel.org,
	Arjan van de Ven <arjan@...ux.intel.com>
Subject: Re: [patch 1/2] x86, fpu: split FPU state from task struct - v5


* Alexey Dobriyan <adobriyan@...il.com> wrote:

> > -	extern void __bad_fxsave_alignment(void);
> > -
> > -	if (offsetof(struct task_struct, thread.i387.fxsave) & 15)
> > -		__bad_fxsave_alignment();
> 
> I think removal of such checks needs giving necessary alignment to 
> cache. Previously it worked because of __aligned((16)) and 
> L1_CACHE_SHIFT combo.

it's still checked, just elsewhere:

> +       WARN_ON((unsigned long)dst->thread.xstate & 15);

i'd not expect us to ever align worse than 16 bytes in the future so 
this is a non-issue i think.

	Ingo
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