linux-kernel - Re: [PATCH] x86: print out in e820_update

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Message-ID: <20090315185519.GB19737@elte.hu>
Date:	Sun, 15 Mar 2009 19:55:19 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: print out in e820_update_range()


* Yinghai Lu <yinghai@...nel.org> wrote:

> Ingo Molnar wrote:
> > * Yinghai Lu <yinghai@...nel.org> wrote:
> > 
> >> Impact: to find crazy calling
> >>
> >> try to print out more info, to catch wrong calling
> > 
> > Could we detect incorrect parameters more directly as well, via 
> > a check and a panic()?
> 
> only valid checking seems to be 
> virt_to_phys(_text), virt_to_phys(_end)
> 
> 
> if (new_type == E820_RESERVED && start >= virt_to_phys(_text) && start <= virt_to_phys(_end)) 
> 	panic("try to update to e820 range for kernel to RESERVED!");

hm, seems a bit too specialized.

	Ingo
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