Re: [PATCH V15 03/11] cper: add timestamp print to CPER status printing

From	Borislav Petkov <bp@alien8.de>
Newsgroups	linux.kernel
Subject	Re: [PATCH V15 03/11] cper: add timestamp print to CPER status printing
Date	2017-04-21 20:30 +0200
Message-ID	<tyLtF-Ix-55@gated-at.bofh.it> (permalink)
References	(1 earlier) <txKzD-3PB-7@gated-at.bofh.it> <tyFRg-5KO-11@gated-at.bofh.it> <tyLjY-Fc-31@gated-at.bofh.it> <tyLjY-Fc-29@gated-at.bofh.it> <tyLjY-Fc-33@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Fri, Apr 21, 2017 at 12:08:43PM -0600, Baicar, Tyler wrote:
> The timestamp may still be useful when it is imprecise. In the polling case,
> you may only poll every minute or so, so the time may be useful.

Well, what is in the timestamp when !precise? Some random time or some
timestamp from a couple of seconds ago? How do you differentiate what
timestamp is bollocks and what is from a while ago?

Is the imprecise tstamp really close to the time the error happened or
pointing at 1970 - the beginning of unix time? :-)

I'm sure you've picked up by now that we don't trust the firmware one
bit.

> Also, I imagine there could be interrupt based errors happening much faster than the
> FW/OS handshake can happen. Maybe we can just use what I had before but also
> specify imprecise so that it is clear:
> 
>         printk("%s%ststamp: %02d%02d-%02d-%02d %02d:%02d:%02d\n", pfx,
>             (timestamp[3] & 0x1 ? "precise " : "imprecise "),
>              century, year, mon, day, hour, min, sec);

I guess.

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

Thread

[PATCH V15 00/11] Add UEFI 2.6 and ACPI 6.1 updates for RAS on ARM64 Tyler Baicar <tbaicar@codeaurora.org> - 2017-04-19 01:10 +0200
  [PATCH V15 04/11] efi: parse ARM processor error Tyler Baicar <tbaicar@codeaurora.org> - 2017-04-19 01:10 +0200
    Re: [PATCH V15 04/11] efi: parse ARM processor error Borislav Petkov <bp@alien8.de> - 2017-04-21 20:30 +0200
      Re: [PATCH V15 04/11] efi: parse ARM processor error "Baicar, Tyler" <tbaicar@codeaurora.org> - 2017-04-21 20:30 +0200
        Re: [PATCH V15 04/11] efi: parse ARM processor error Borislav Petkov <bp@alien8.de> - 2017-04-24 20:00 +0200
  [PATCH V15 05/11] arm64: exception: handle Synchronous External Abort Tyler Baicar <tbaicar@codeaurora.org> - 2017-04-19 01:10 +0200
  [PATCH V15 03/11] cper: add timestamp print to CPER status printing Tyler Baicar <tbaicar@codeaurora.org> - 2017-04-19 01:20 +0200
    Re: [PATCH V15 03/11] cper: add timestamp print to CPER status  printing Borislav Petkov <bp@alien8.de> - 2017-04-21 14:30 +0200
      Re: [PATCH V15 03/11] cper: add timestamp print to CPER status  printing Borislav Petkov <bp@alien8.de> - 2017-04-21 20:20 +0200
        Re: [PATCH V15 03/11] cper: add timestamp print to CPER status  printing "Baicar, Tyler" <tbaicar@codeaurora.org> - 2017-04-21 20:20 +0200
          Re: [PATCH V15 03/11] cper: add timestamp print to CPER status  printing Borislav Petkov <bp@alien8.de> - 2017-04-21 20:30 +0200
      Re: [PATCH V15 03/11] cper: add timestamp print to CPER status  printing "Baicar, Tyler" <tbaicar@codeaurora.org> - 2017-04-21 20:50 +0200

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