linux-kernel - Re: [PATCH] arch/x86: Fix kdump on x86 with physically hotadded CPUs

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Date:   Tue, 4 Oct 2016 16:19:59 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Jiri Olsa <jolsa@...hat.com>
cc:     Prarit Bhargava <prarit@...hat.com>, linux-kernel@...r.kernel.org,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Len Brown <len.brown@...el.com>, Borislav Petkov <bp@...e.de>,
        Andi Kleen <ak@...ux.intel.com>,
        Juergen Gross <jgross@...e.com>, dyoung@...hat.com,
        Eric Biederman <ebiederm@...ssion.com>,
        kexec@...ts.infradead.org
Subject: Re: [PATCH] arch/x86: Fix kdump on x86 with physically hotadded
 CPUs

On Tue, 4 Oct 2016, Jiri Olsa wrote:
> On Tue, Oct 04, 2016 at 12:58:04PM +0200, Thomas Gleixner wrote:
> > > pmu->boxes[pkg] is garbage because pkg was returned as 0xffff.
> > 
> > And that's what needs to be fixed in the first place.
> 
> right, I'll check on that.. but I think we need this fix as well

That's right.
 
> I was wondering if acpi_boot_init was a better place for that, but then
> Prarit suggested in our discussion that the prefill_possible_map() call
> seems to be a hotplug cleanup.. so it seemed to fit

It's the right place for it.

Thanks,

	tglx