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

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Message-ID: <alpine.DEB.2.21.1808201646440.1551@nanos.tec.linutronix.de>
Date:   Mon, 20 Aug 2018 16:47:11 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Jinpu Wang <jinpu.wang@...fitbricks.com>
cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable <stable@...r.kernel.org>, linux-kernel@...r.kernel.org,
        Ingo Molnar <mingo@...nel.org>, konrad.wilk@...cle.com,
        Peter Zijlstra <peterz@...radead.org>,
        David Woodhouse <dwmw@...zon.co.uk>
Subject: Re: [BUG]smt sysfs dir missing on 4.4.148 and 4.14.63

On Mon, 20 Aug 2018, Jinpu Wang wrote:
> On Mon, Aug 20, 2018 at 3:02 PM Thomas Gleixner <tglx@...utronix.de> wrote:
> > That works, but we might as well force 'select HOTPLUG_CPU if SMP' so the
> > L1TF mitigations are functional. Sigh....
> >
> > Thanks,
> >
> >         tglx
> right, sth like?
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index b0312f8..5852948 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -188,7 +188,8 @@ config X86
>         select HAVE_SYSCALL_TRACEPOINTS
>         select HAVE_UNSTABLE_SCHED_CLOCK
>         select HAVE_USER_RETURN_NOTIFIER
> -       select HOTPLUG_SMT                      if SMP
> +       select HOTPLUG_CPU                      if SMP
> +       select HOTPLUG_SMT                      if SMP && HOTPLUG_CPU

The && HOTPLUG is pretty pointless now.