linux-kernel - Re: [PATCh] x86: overmapped fix when 4K pages on tail

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Date:	Thu, 10 Jul 2008 08:53:16 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Yinghai Lu <yhlu.kernel@...il.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>
Subject: Re: [PATCh] x86: overmapped fix when 4K pages on tail - 64bit

* Yinghai Lu <yhlu.kernel@...il.com> wrote:

> fix phys_pmd_init to make sure not to return big value than end.
> 
> also print out range split:1G/2M/4K

applied to tip/x86/core, thanks Yinghai. Lets hope it all goes well, 
this is a rather scary change - but it's also fairly clean.

perhaps add a comment to the limit of 5 of mapping ranges - to point out 
that the number of mapping ranges depends on our programming, not on any 
external factor. I.e. if anyone adds a new mapping range to the kernel 
for any purpose, it must be extended - but otherwise it cannot run out 
due to new hardware.

	Ingo
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