Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Sat, 18 Aug 2018 14:50:49 +0200 (CEST)
From:   Thomas Gleixner <tglx@linutronix.de>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>
cc:     Jinpu Wang <jinpu.wang@profitbricks.com>,
        stable <stable@vger.kernel.org>, linux-kernel@vger.kernel.org,
        Ingo Molnar <mingo@kernel.org>, konrad.wilk@oracle.com
Subject: Re: [BUG]smt sysfs dir missing on 4.4.148 and 4.14.63
In-Reply-To: <20180817170129.GE24945@kroah.com>
Message-ID: <alpine.DEB.2.21.1808181330380.2151@nanos.tec.linutronix.de>
References: <CAMGffEnzVo5VVSVBjCOBMhcoV1qXf0XXqJqr3C01xQn-aUiZFQ@mail.gmail.com> <20180816155126.GA18296@kroah.com> <CAMGffEmJR310NKHO1JpwE8yTg1Oeu_oaTaJ1D2_T_UHKCnHwKA@mail.gmail.com> <20180816163937.GA5105@kroah.com> <CAMGffEk2FqRn0av7T-aF-TKvRAKeinm96NYjJju_T4CmUrYPkQ@mail.gmail.com>
 <CAMGffEnKt0xcc6LhNdZQGRmckJ3qCFxCOnQ3owZmWWiaKYdYuw@mail.gmail.com> <20180817170129.GE24945@kroah.com>
User-Agent: Alpine 2.21 (DEB 202 2017-01-01)
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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