linux-kernel - Re: Config NO_BOOTMEM breaks my amd64 box

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Message-ID: <r2h21d7e9971003311414pc38f5bebk1778a01872657395@mail.gmail.com>
Date:	Thu, 1 Apr 2010 07:14:08 +1000
From:	Dave Airlie <airlied@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	James Morris <jmorris@...ei.org>, "H. Peter Anvin" <hpa@...or.com>,
	Yinghai Lu <yinghai@...nel.org>, linux-kernel@...r.kernel.org,
	airlied@...ux.ie, Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: Config NO_BOOTMEM breaks my amd64 box

On Thu, Apr 1, 2010 at 4:59 AM, Ingo Molnar <mingo@...e.hu> wrote:
>
> * James Morris <jmorris@...ei.org> wrote:
>
>> On Tue, 30 Mar 2010, H. Peter Anvin wrote:
>>
>> > On 03/30/2010 09:49 PM, James Morris wrote:
>> > >
>> > > Please make NO_BOOTMEM default to n, at least for amd64, where I've found
>> > > that it leads to all kinds of strange, undebuggable boot hangs and errors
>> > > (with relatively current Fedora development userland).
>> >
>> > Have you tested it with the latest fixes that are now in Linus' tree (-rc3)?
>>
>> Yes, it was happening with -rc3.
>
> Could you please send the bootlog that Yinghai asked for, plus also one that
> you get with NO_BOOTMEM turned off (for comparison)?
>
> Also, when did you first hit this bug? This code has been upstream for almost
> a month, and it was in linux-next before that - so you should have hit this
> much sooner. A rough timeframe would suffice. I suppose you were booting
> upstream kernels during the merge window as well?
>
> We can flip the default around if there's no fix available based on the
> bootlogs. (Plus the help text should definitely be improved.)
>

Are you testing this btw with initramfs/initrds? I suspect lots of testing
is being done by people on monolithic kernels, this is just a misc guess,
considering I couldn't boot from when this landed until rc3 with this option
on a basic 32-bit install on a dual-core 64-bit CPU, it suggested a
hole of some sort
in the test coverage.

Dave
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