linux-kernel - Re: linux-next: parsing mem=700M broken

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Message-ID: <86802c440812271807q3decd21i5da99754d708449d@mail.gmail.com>
Date:	Sat, 27 Dec 2008 18:07:59 -0800
From:	"Yinghai Lu" <yinghai@...nel.org>
To:	"Hugh Dickins" <hugh@...itas.com>
Cc:	"Rusty Russell" <rusty@...tcorp.com.au>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Stephen Rothwell" <sfr@...b.auug.org.au>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, "Paul Mackerras" <paulus@...ba.org>,
	"Benjamin Herrenschmidt" <benh@....ibm.com>
Subject: Re: linux-next: parsing mem=700M broken

On Sat, Dec 27, 2008 at 4:43 PM, Hugh Dickins <hugh@...itas.com> wrote:
> On Sat, 27 Dec 2008, Rusty Russell wrote:
>> > On Thursday 25 December 2008 01:14:35 Hugh Dickins wrote:
>> > But (of course: it's a patch to arch/x86) doesn't help at all on
>> > ppc64; and I presume other architectures also remain broken...
>>
>> Confirmed ppc64.  But it's broken in a *different* way.
>>
>> Whereas most archs called parse_early_param from setup_arch, powerpc
>> does it before start_kernel.  So instead of moving parsing earlier,
>> my patch actually moved it later for powerpc.
>>
>> Too late, for mem=.
>>
>> Rather than try to untangle the powerpc boot process (most archs would
>> do most of this in setup_arch), I think I have to expose the parser
>> again so they can call it:
>>
>> commit 25bf48b74b9fb23b347d00656b604f9e55c72183
>> Author: Rusty Russell <rusty@...tcorp.com.au>
>> Date:   Sat Dec 27 23:40:37 2008 +1030
>>
>>     Fix powerpc (tested on ppc64) command line handling.
>>     Powerpc used to call parse_early_param() really early; the change made
>>     it too late.  Put it back.
>
> I'll make no pretence of reviewing any of this, but this has
> indeed got mem= back working for me on a 2.6.28-rc9-mm1 - thanks!
>
> I have to wonder if all this comes too late in the cycle for 2.6.29:
> changing the early param handling of all the arches is difficult,
> and apparently hasn't been much tested in the short time that it's
> been out there in linux-next.  But of course, not for me to decide.
>

should be ok, just need to go over all early_param()

YH
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