linux-kernel - Re: kexec load failure introduced by "x86, memblock: Replace e820_/_early string with memblock

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Message-ID: <4CA129EB.5000309@zytor.com>
Date:	Mon, 27 Sep 2010 16:34:03 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	caiqian@...hat.com, Ingo Molnar <mingo@...e.hu>,
	kexec <kexec@...ts.infradead.org>, linux-kernel@...r.kernel.org
Subject: Re: kexec load failure introduced by "x86, memblock: Replace e820_/_early
 string with memblock_"

On 09/27/2010 04:32 PM, Yinghai Lu wrote:
> On 09/27/2010 04:26 PM, H. Peter Anvin wrote:
>> On 09/27/2010 04:20 PM, Yinghai Lu wrote:
>>>
>>> x86 own version for find_area?
>>>
>>
>> No, double no.
>>
>> Same kind of crap: overloading an interface with semantics it shouldn't
>> have.  The right thing is to introduce a new interface with carries the
>> explicitly needed policy with it... e.g. memblock_find_in_range_lowest().
>>
>> That interface would have the explicit semantics of returning the lowest
>> possible address, as opposed to any suitable address (which may change
>> if policy requirements change.)
>>
>> The other question is why does kexec need this in the first place?  Is
>> this due to a design bug in kexec or is there some fundamental reason
>> for this?
> 
> bzImage is used here. so need range below 4g.
> 

OK, so why don't you cap the range to 4 GiB and then pass that down to
the existing interface?  That's different from "lowest possible address".

	-hpa

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