linux-kernel - Re: Crash while mapping memory in pagetable

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Message-ID: <461FE448.70605@goop.org>
Date:	Fri, 13 Apr 2007 13:12:56 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Zachary Amsden <zach@...are.com>
CC:	Chris Wright <chrisw@...s-sol.org>, Andi Kleen <ak@...e.de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Crash while mapping memory in pagetable_init() (Was: Re: .config)

Zachary Amsden wrote:
> Note you can always run out of space; to ensure safety, the init code
> needs to not use a fixed mapping size, it needs to map
> end_kernel_address + pae ? 1808k : 896k, assuming 128M vmalloc hole. 
> This could cause problems like running into initrd, however, so might
> require loader changes, or perhaps relocating the initrd.  Is the
> solution to just cap the kernel size at some fixed maximum?  6.2M
> appears to be the safe limit for all configurations.
>
> I'm pulling this back onto lkml; seems this is a serious bug which
> needs attention.  I've also cc'd some parties that might have relevant
> knowledge.  Why do I seem to recall head.S mapping 128M of mappings at
> one point in time? 

I just posted a patch.  Oops, forgot to Cc: Eric.

    J
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