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

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Date:	Tue, 30 Sep 2008 17:28:01 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Venki Pallipadi <venkatesh.pallipadi@...el.com>
Cc:	Christoph Lameter <cl@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	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

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...

Thanks,
Nick
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