linux-kernel - Re: [PATCH RESEND] x86/smpboot: Unbreak CPU0 hotplug

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Message-ID: <87fucztyww.fsf@vitty.brq.redhat.com>
Date:   Thu, 10 Aug 2017 14:01:03 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     x86@...nel.org
Cc:     linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH RESEND] x86/smpboot: Unbreak CPU0 hotplug

Vitaly Kuznetsov <vkuznets@...hat.com> writes:

> A hang on CPU0 onlining after a preceding offlining is observed. Trace
> shows that CPU0 is stuck in check_tsc_sync_target() waiting for source
> CPU to run check_tsc_sync_source() but this never happens. Source CPU,
> in its turn, is stuck on synchronize_sched() which is called from
> native_cpu_up() -> do_boot_cpu() -> unregister_nmi_handler().
>
> Fix the issue by moving unregister_nmi_handler() from do_boot_cpu() to
> native_cpu_up() after cpu onlining is done.
>
> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
> ---
> It's been awile since my v1 submission, no comments so far. Resending.

Sorry, but 

ping?

I haven't received a single comment on this since the initial submission
on June, 26 - is it so bad? :-)

-- 
  Vitaly