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From: Ingo Molnar <mingo@elte.hu>
To: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>,
	hpa@zytor.com, tglx@linutronix.de, andi@firstfloor.org,
	hch@infradead.org, linux-kernel@vger.kernel.org,
	Arjan van de Ven <arjan@linux.intel.com>
Subject: Re: [patch 1/2] x86, fpu: split FPU state from task struct - v5
Date: Tue, 11 Mar 2008 09:35:17 +0100	[thread overview]
Message-ID: <20080311083517.GC25110@elte.hu> (raw)
In-Reply-To: <20080311050644.GB4589@martell.zuzino.mipt.ru>


* Alexey Dobriyan <adobriyan@gmail.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

  reply	other threads:[~2008-03-11  8:35 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-03-10 22:28 Suresh Siddha
2008-03-10 22:28 ` [patch 2/2] x86, fpu: lazy allocation of FPU area " Suresh Siddha
2008-03-11  9:08   ` Ingo Molnar
2008-03-11 20:57     ` Suresh Siddha
2008-03-10 22:56 ` [patch 1/2] x86, fpu: split FPU state from task struct " Andi Kleen
2008-03-11  5:07 ` Alexey Dobriyan
2008-03-11  8:35   ` Ingo Molnar [this message]
2008-03-11 10:09     ` Alexey Dobriyan
2008-03-11 10:11       ` Ingo Molnar
2008-03-11 20:22         ` Suresh Siddha
2008-03-11 20:19   ` Suresh Siddha

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