Re: [PATCH] Revert "x86/apic: Remove init_bsp_APIC()"

[Dou Liyang]

Hi, Ville

At 11/30/2017 05:25 AM, Ville Syrjälä wrote:
> On Wed, Nov 29, 2017 at 09:15:19AM +0800, Dou Liyang wrote:
> > Hi Ville,
> >
> > At 11/28/2017 10:53 PM, Ville Syrjala wrote:
> > > From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> > >
> > > This reverts commit b371ae0d4a194b178817b0edfb6a7395c7aec37a.
> > >
> > > Causes my P3 UP machine to hang at boot with "lapic".
> > >
> > > Cc: Dou Liyang <douly.fnst@xxxxxxxxxxxxxx>
> > > Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> > > Cc: yinghai@xxxxxxxxxx
> > > Cc: bhe@xxxxxxxxxx
> > > Cc: Ingo Molnar <mingo@xxxxxxxxxx>
> > > Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
> > > Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> > > ---
> >
> > Could you give me the dmesg log of your P3 UP machine?
>
> This is with the revert:

Oops, Sorry about my ambiguous description, I knew the revert patch
could work.

Actually, It's an interesting problem. your machine (UP system without
ACPI table and MP table) will make the interrupt mode in a rare
situation:

  Virtual Wire Mode with no configuration

My test cases also simulate this situation, can work well. I hope to
know why you machine hang?

So, the true thing I want to get is the log without the revert.
or could you tell me the phenomenon and reason of your machine hang
directly. :-)

Thanks,
	dou