linux-kernel - Re: [patch 1/2] x86: track memtype for RAM in page struct

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Message-ID: <20080930112128.GB21367@elte.hu>
Date:	Tue, 30 Sep 2008 13:21:28 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	Venki Pallipadi <venkatesh.pallipadi@...el.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	"arjan@...ux.intel.com" <arjan@...ux.intel.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"hpa@...or.com" <hpa@...or.com>,
	"andi@...stfloor.org" <andi@...stfloor.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
Subject: Re: [patch 1/2] x86: track memtype for RAM in page struct - v3


* Nick Piggin <nickpiggin@...oo.com.au> wrote:

> On Thursday 25 September 2008 01:53, Venki Pallipadi wrote:
> 
> >  /*
> > + * RED-PEN:  TODO: Add PageReserved() check as well here,
> > + * once we add SetPageReserved() to all the drivers using
> > + * set_memory_* or set_pages_*.
> > + *
> > + * This will help prevent accidentally freeing pages
> > + * before setting the attribute back to WB.
> > + */
> 
> I'd rather we didn't add any more uses of PageReserved without a
> really good reason.
> 
> At this point in time (or at least last time I looked, a year or
> two ago), it isn't a whole lot of work to remove PG_reserved
> completely. If the waters get muddied up again, it could require
> another significant rework to remove it in future...

agreed.

	Ingo
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