linux-kernel - Re: [RFC] [PATCH 2.6.19-rc4] kdump panics early in boot when reserving MP Tables located in high memory

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Message-Id: <200611032052.05738.ak@suse.de>
Date:	Fri, 3 Nov 2006 20:52:05 +0100
From:	Andi Kleen <ak@...e.de>
To:	Amul Shah <amul.shah@...sys.com>
Cc:	vgoyal@...ibm.com, LKML <linux-kernel@...r.kernel.org>,
	Fastboot mailing list <fastboot@...ts.osdl.org>
Subject: Re: [RFC] [PATCH 2.6.19-rc4] kdump panics early in boot when   reserving MP Tables located in high memory

On Friday 03 November 2006 20:47, Amul Shah wrote:

> Andi, Vivek is right.  We can use end_pfn_map.  My observation is wrong.

Ok. Then my patch should work?

> Vivek, the problem condition is in generic reserve_bootmem_core
> (mm/bootmem.c), where this
> 	BUG_ON(PFN_DOWN(addr) >= bdata->node_low_pfn);
> checks the target address against the top of that node's memory.

In general these early BUGs should be eliminated - they are always
messy because the kernel exception handlers are not fully functional
yet. printks or worst case panics are better.

-Andi
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