linux-kernel - RE: [patch 07/11] PAT x86: pat-conflict resolution using linear list

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Date:	Thu, 10 Jan 2008 12:08:16 -0800
From:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
To:	"Andi Kleen" <andi@...stfloor.org>
Cc:	<ebiederm@...ssion.com>, <rdreier@...co.com>,
	<torvalds@...ux-foundation.org>, <gregkh@...e.de>,
	<airlied@...net.ie>, <davej@...hat.com>, <mingo@...e.hu>,
	<tglx@...utronix.de>, <linux-kernel@...r.kernel.org>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
Subject: RE: [patch 07/11] PAT x86: pat-conflict resolution using linear list


>-----Original Message-----
>From: Andi Kleen [mailto:andi@...stfloor.org] 
>Sent: Thursday, January 10, 2008 11:13 AM
>To: Pallipadi, Venkatesh
>Cc: ebiederm@...ssion.com; rdreier@...co.com; 
>torvalds@...ux-foundation.org; gregkh@...e.de; 
>airlied@...net.ie; davej@...hat.com; mingo@...e.hu; 
>tglx@...utronix.de; hpa@...or.co; 
>linux-kernel@...r.kernel.org; Siddha, Suresh B
>Subject: Re: [patch 07/11] PAT x86: pat-conflict resolution 
>using linear list
>
>venkatesh.pallipadi@...el.com writes:
>>  
>>  	/* Reset the direct mapping. Can block */
>> -	if (p->flags >> 20)
>> -		ioremap_change_attr(p->phys_addr, p->size, 0);
>> +	if (p->flags >> 20) {
>> +		free_mattr(p->phys_addr, p->phys_addr + 
>get_vm_area_size(p),
>> +		           p->flags>>20);
>> +		ioremap_change_attr(p->phys_addr, 
>get_vm_area_size(p), 0);
>
>If you really unmap all holes and forbid (or let it just return the
>__va address) ioremap on anything mapped (which is probably ok) then
>you can eliminate that completely.
>

We heard X can allocate a page and then map it UC using it through gart.
So, I don't we can forbid all ioremaps for RAM.

Thanks,
Venki
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