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Date: Thu, 10 Dec 2009 20:07:42 +0100
From: Jens Axboe <jens.axboe@oracle.com>
To: Yinghai Lu <yinghai@kernel.org>
Cc: Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>,
       "H. Peter Anvin" <hpa@zytor.com>,
       "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: Bisected regression (Was Re: current -git fails to boot on
	nehalem-ex)
Message-ID: <20091210190742.GS8742@kernel.dk>
References: <20091210091040.GG8742@kernel.dk> <20091210103945.GI8742@kernel.dk> <20091210160640.GB27794@elte.hu> <67EA4830-231F-45C9-A1A6-CE1C6CD9493D@kernel.org> <20091210180727.GK8742@kernel.dk> <4B213F1F.2020305@kernel.org> <4B2140F8.3020201@kernel.org> <20091210184506.GP8742@kernel.dk>
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On Thu, Dec 10 2009, Jens Axboe wrote:
> > >> [    0.000000] Kernel panic - not syncing: Overlapping early reservations 12-f011 MP-table mpc to 0-fff BIOS data page
> > > 
> > > mptable mpc is [12 - f011]
> > > 
> > > what a BIOS !
> > > 
> > > can you check if it works with 2.6.32 + "acpi=off"?
> 
> I'll try that.

Yes, 2.6.32 boots fine with acpi=off passed.

> > please check if this one could workaround it.
> > 
> > diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
> > index d17d482..f60acec 100644
> > --- a/arch/x86/kernel/e820.c
> > +++ b/arch/x86/kernel/e820.c
> > @@ -732,7 +732,7 @@ struct early_res {
> >  	char overlap_ok;
> >  };
> >  static struct early_res early_res[MAX_EARLY_RES] __initdata = {
> > -	{ 0, PAGE_SIZE, "BIOS data page" },	/* BIOS data page */
> > +	{ 0, PAGE_SIZE, "BIOS data page", 1 },	/* BIOS data page */
> >  	{}
> >  };
> 
> And then this. Results in 10-15min.

Doesn't work, it just complains about a different overlap:

[    0.000000] Kernel panic - not syncing: Overlapping early
reservations 12-f011 MP-table mpc to 6000-7fff TRAMPOLINE
[    0.000000] 
[    0.000000] Pid: 0, comm: swapper Not tainted 2.6.32 #51
[    0.000000] Call Trace:
[    0.000000]  [<ffffffff813c709b>] panic+0xa0/0x16a
[    0.000000]  [<ffffffff8167d280>] ?
reserve_early_overlap_ok+0x2e/0x39
[    0.000000]  [<ffffffff8167d24a>] ?
drop_overlaps_that_are_ok+0x117/0x11f
[    0.000000]  [<ffffffff8167d133>] drop_overlaps_that_are_ok+0x0/0x11f
[    0.000000]  [<ffffffff8167d2c6>] reserve_early+0x3b/0x3d
[    0.000000]  [<ffffffff81683248>] smp_scan_config+0xe7/0x10e
[    0.000000]  [<ffffffff816832a9>] default_find_smp_config+0x3a/0x60
[    0.000000]  [<ffffffff8167b0be>] setup_arch+0x6ae/0xa88
[    0.000000]  [<ffffffff816789ff>] start_kernel+0x82/0x412
[    0.000000]  [<ffffffff81678289>] x86_64_start_reservations+0x99/0xb9
[    0.000000]  [<ffffffff81678389>] x86_64_start_kernel+0xe0/0xf2


-- 
Jens Axboe

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