linux-kernel - Re: [BUG]smt sysfs dir missing on 4.4.148 and 4.14.63

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Message-ID: <alpine.DEB.2.21.1808181330380.2151@nanos.tec.linutronix.de>
Date:   Sat, 18 Aug 2018 14:50:49 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
cc:     Jinpu Wang <jinpu.wang@...fitbricks.com>,
        stable <stable@...r.kernel.org>, linux-kernel@...r.kernel.org,
        Ingo Molnar <mingo@...nel.org>, konrad.wilk@...cle.com
Subject: Re: [BUG]smt sysfs dir missing on 4.4.148 and 4.14.63

On Fri, 17 Aug 2018, Greg Kroah-Hartman wrote:
> On Fri, Aug 17, 2018 at 02:39:00PM +0200, Jinpu Wang wrote:
> >
> > I found the problem, CONFIG_HOTPLUG_SMT is enable due to CONFIG_SMP,
> > but I did explicitly enable CONFIG_HOTPLUG_CPU.
> > 
> > That's why the smt dir is missing, and kernel panic when I boot with
> > 'nosmt' or 'l1tf=full' probably also other combination.
> > 
> > With CONFIG_HOTPLUG_CPU=y, it works fine so far.
> 
> So do we need a new configuration dependancy here to resolve this
> problem?  Why is this not an issue in Linus's tree?

That's probably the same problem on Linus tree. Have not tested it yet
though. I'll have a look.

Thanks,

	tglx