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Groups > linux.kernel > #1202474

Re: [BUG]: Intel uncore boot warning introduced in 4.1

From Peter Zijlstra <peterz@infradead.org>
Newsgroups linux.kernel
Subject Re: [BUG]: Intel uncore boot warning introduced in 4.1
Date 2015-08-07 11:10 +0200
Message-ID <pULP5-3mH-19@gated-at.bofh.it> (permalink)
References <pUqUi-6vT-3@gated-at.bofh.it> <pUw3E-5JN-15@gated-at.bofh.it> <pUxVM-8tG-9@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Thu, Aug 06, 2015 at 06:10:40PM +0000, Liang, Kan wrote:
> The issue may be caused by uncore box initialization.
> 
> For preventing the potential issues of uncore box initialization, I once
> moved the uncore_box_init() out of driver initialization in commit
> c05199e5a57a579fea1e8fa65e2b511ceb524ffc.
> 
> However, it cause some desktop crash, because the box initialization
> codes were moved in IPI context.
>  
> For fixing the crash issue, we had two choice at that time.
>  - Simply revert the codes. That's where is
> 15c1247953e8a45232ed5a5540f291d2d0a77665 from.
>  - Move uncore_box_init out of IPI context to uncore event
>    init. I provided a patch for it. https://lkml.org/lkml/2015/4/28/21
>   Stephane Eranian also verified it on his platform
> 
> At that time, we chose first option. But it looks there is some
> issue now. I guess we may try the second option this time.
> 
> Matthew,
> 
> Could you please revert
> 15c1247953e8a45232ed5a5540f291d2d0a77665
> and apply the patch https://lkml.org/lkml/2015/4/26/294?
> See if it works?

That patch is wrong though; how can even publish a PMU which is not
initialized?


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Thread

[BUG]: Intel uncore boot warning introduced in 4.1 Matthew Leach <matthew@mattleach.net> - 2015-08-06 12:50 +0200
  Re: [BUG]: Intel uncore boot warning introduced in 4.1 Matthew Leach <matthew@mattleach.net> - 2015-08-06 18:20 +0200
    RE: [BUG]: Intel uncore boot warning introduced in 4.1 "Liang, Kan" <kan.liang@intel.com> - 2015-08-06 20:20 +0200
      Re: [BUG]: Intel uncore boot warning introduced in 4.1 Matthew Leach <matthew@mattleach.net> - 2015-08-06 20:50 +0200
      Re: [BUG]: Intel uncore boot warning introduced in 4.1 Peter Zijlstra <peterz@infradead.org> - 2015-08-07 11:10 +0200
        RE: [BUG]: Intel uncore boot warning introduced in 4.1 "Liang, Kan" <kan.liang@intel.com> - 2015-08-10 15:30 +0200

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