linux-kernel - Re: [PATCH 4.9 033/120] perf/x86/intel/uncore: Fix hardcoded socket 0 assumption in the Haswell init code

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Message-ID: <20170119132147.GA19048@gmail.com>
Date:   Thu, 19 Jan 2017 14:21:47 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Prarit Bhargava <prarit@...hat.com>, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Borislav Petkov <bp@...e.de>, "H. Peter Anvin" <hpa@...or.com>,
        Harish Chegondi <harish.chegondi@...el.com>,
        Jiri Olsa <jolsa@...hat.com>, Kan Liang <kan.liang@...el.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Stephane Eranian <eranian@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vince Weaver <vincent.weaver@...ne.edu>
Subject: Re: [PATCH 4.9 033/120] perf/x86/intel/uncore: Fix hardcoded socket
 0 assumption in the Haswell init code


* Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote:

> On Thu, Jan 19, 2017 at 05:32:46AM -0500, Prarit Bhargava wrote:
> > 
> > 
> > On 01/18/2017 05:25 PM, Ingo Molnar wrote:
> > > 
> > > * Prarit Bhargava <prarit@...hat.com> wrote:
> > > 
> > >> 4.9 is broken and requires additional patches beyond this patch.  Applying this 
> > >> patch to 4.9 stable without those additional fixes will result in kernel panics 
> > >> on some Haswell systems that boot on random cores.
> > > 
> > > Could you list the patches that are required? It would be nice to backport all 
> > > required fixes to v4.9.
> > > 
> > 
> > Yeah, I'm going to do that once I get the system back.  I have a feeling that
> > just the two additional patches are required but I want to make sure before I
> > post anything.
> 
> So what do I do here?  Drop this single patch?  Add others now?  Ignore
> it and leave it as-is?
> 
> still confused,

Please drop the patch for now - we'll sort it all out and will send you a list of 
commit IDs to backport once everything's clear!

Thanks,

	Ingo