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Re: [Patch V0] x86, mce: Ensure offline CPU's don't participate in mce rendezvous process.

From Borislav Petkov <bp@alien8.de>
Newsgroups linux.kernel
Subject Re: [Patch V0] x86, mce: Ensure offline CPU's don't participate in mce rendezvous process.
Date 2015-12-04 20:40 +0100
Message-ID <qC4n0-6Wi-9@gated-at.bofh.it> (permalink)
References (4 earlier) <qC2ld-5GD-31@gated-at.bofh.it> <qC2uU-5Kw-61@gated-at.bofh.it> <qC2Od-5RV-3@gated-at.bofh.it> <qC2XU-6b1-7@gated-at.bofh.it> <qC3qW-6kU-19@gated-at.bofh.it>
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On Fri, Dec 04, 2015 at 06:30:39PM +0000, Luck, Tony wrote:
> Ashok wants to move in stage 2 to having the offline cpu scan banks and report
> any errors seen there.  To do that we'll have to run through a fair bit of the
> do_machine_check() code.

I'm still very sceptical whether logging those errors are worth the risk
of running code on an offlined CPU.

> But ... if you want a super safe version to put the stable tag on ... we could
> just have something like this at the head of do_machine_check()

It would be prudent IMO. We don't want to disrupt stable kernels
unnecessarily.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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Thread

[Patch V0] x86, mce: Ensure offline CPU's don't participate in mce rendezvous process. Ashok Raj <ashok.raj@intel.com> - 2015-12-04 00:20 +0100
  Re: [Patch V0] x86, mce: Ensure offline CPU's don't participate in  mce rendezvous process. Greg KH <greg@kroah.com> - 2015-12-04 00:40 +0100
  Re: [Patch V0] x86, mce: Ensure offline CPU's don't participate in  mce rendezvous process. Borislav Petkov <bp@alien8.de> - 2015-12-04 15:40 +0100
    Re: [Patch V0] x86, mce: Ensure offline CPU's don't participate in  mce rendezvous process. "Raj, Ashok" <ashok.raj@intel.com> - 2015-12-04 17:20 +0100
      Re: [Patch V0] x86, mce: Ensure offline CPU's don't participate in  mce rendezvous process. Borislav Petkov <bp@alien8.de> - 2015-12-04 18:00 +0100
        RE: [Patch V0] x86, mce: Ensure offline CPU's don't participate in  mce rendezvous process. "Luck, Tony" <tony.luck@intel.com> - 2015-12-04 18:30 +0100
          Re: [Patch V0] x86, mce: Ensure offline CPU's don't participate in  mce rendezvous process. Borislav Petkov <bp@alien8.de> - 2015-12-04 18:40 +0100
            RE: [Patch V0] x86, mce: Ensure offline CPU's don't participate in  mce rendezvous process. "Luck, Tony" <tony.luck@intel.com> - 2015-12-04 19:00 +0100
              Re: [Patch V0] x86, mce: Ensure offline CPU's don't participate in  mce rendezvous process. Borislav Petkov <bp@alien8.de> - 2015-12-04 19:10 +0100
                RE: [Patch V0] x86, mce: Ensure offline CPU's don't participate in  mce rendezvous process. "Luck, Tony" <tony.luck@intel.com> - 2015-12-04 19:40 +0100
                Re: [Patch V0] x86, mce: Ensure offline CPU's don't participate in  mce rendezvous process. Borislav Petkov <bp@alien8.de> - 2015-12-04 20:40 +0100
              Re: [Patch V0] x86, mce: Ensure offline CPU's don't participate in  mce rendezvous process. Andy Lutomirski <luto@amacapital.net> - 2015-12-04 23:40 +0100
                Re: [Patch V0] x86, mce: Ensure offline CPU's don't participate in  mce rendezvous process. "Raj, Ashok" <ashok.raj@intel.com> - 2015-12-05 00:10 +0100
                Re: [Patch V0] x86, mce: Ensure offline CPU's don't participate in  mce rendezvous process. Andy Lutomirski <luto@amacapital.net> - 2015-12-05 00:20 +0100

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