linux-kernel - Re: [crash] Re: Latest brk patchset

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Date:	Mon, 16 Mar 2009 14:14:43 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Yinghai Lu <yinghai@...nel.org>, Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [crash] Re: Latest brk patchset

Jeremy Fitzhardinge wrote:
> 
> Well, its a bit more complex than that; we'd need to make it conditional 
> on the user/kernel split, which seems all a bit fiddly.  I guess it 
> could be something like:
> 
> MAPPING_BEYOND_END = PAGE_TABLE_SIZE((1<<(32-PAGE_SHIFT)) - (PAGE_OFFSET 
> / PAGE_SIZE)) * PAGE_SIZE
> 

Or simplified:

PAGE_TABLE_SIZE(((1 << 32)-PAGE_OFFSET) >> PAGE_SHIFT) << PAGE_SHIFT

	-hpa

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