linux-kernel - Re: [PATCH] x86: mpparse: fix mp_bus_not

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Date:	Tue, 18 Oct 2011 08:35:34 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Dan McGrath <troubledaemon@...il.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, Jonathan Nieder <jrnieder@...il.com>,
	Alexey Starikovskiy <astarikovskiy@...e.de>
Subject: Re: [PATCH] x86: mpparse: fix mp_bus_not_pci handling


* Bjorn Helgaas <bhelgaas@...gle.com> wrote:

> On Sun, Sep 25, 2011 at 3:29 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> > Dan bisected a Dell PowerEdge 4200 boot regression to commit f8924e770.
> > Prior to that commit, 32-bit kernels set mp_bus_not_pci for all buses
> > except PCI.  Afterwards, we set mp_bus_not_pci only for ISA.  But ISA is
> > not the only non-PCI bus, so it's better to always set mp_bus_not_pci
> > and clear it only for PCI.
> >
> > The workaround was to boot with "noapic".  Dan verified that with this
> > patch, his system boots without "noapic".
> >
> > Reference: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=586494
> > Reported-and-tested-by: Dan McGrath <troubledaemon@...il.com>
> > Cc: Alexey Starikovskiy <astarikovskiy@...e.de>
> > Cc: stable@...nel.org # 2.6.26+
> > Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
> > ---
> >  arch/x86/kernel/mpparse.c |    2 +-
> >  1 files changed, 1 insertions(+), 1 deletions(-)
> >
> > diff --git a/arch/x86/kernel/mpparse.c b/arch/x86/kernel/mpparse.c
> > index 9103b89..0741b062 100644
> > --- a/arch/x86/kernel/mpparse.c
> > +++ b/arch/x86/kernel/mpparse.c
> > @@ -95,8 +95,8 @@ static void __init MP_bus_info(struct mpc_bus *m)
> >        }
> >  #endif
> >
> > +       set_bit(m->busid, mp_bus_not_pci);
> >        if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA) - 1) == 0) {
> > -               set_bit(m->busid, mp_bus_not_pci);
> >  #if defined(CONFIG_EISA) || defined(CONFIG_MCA)
> >                mp_bus_id_to_type[m->busid] = MP_BUS_ISA;
> >  #endif
> >
> >
> 
> Ping?  I don't see this in linux-next, so I don't know if it got
> dropped or if there's something wrong with it.

Please resend - this is one of the mails that got lost in my korg 
email disconnect.

Patch looks good at first sight.

Thanks,

	Ingo
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