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From: Borislav Petkov <bp@alien8.de>
To: "Baicar, Tyler" <tbaicar@codeaurora.org>
Cc: linux-efi@vger.kernel.org, kvm@vger.kernel.org,
	matt@codeblueprint.co.uk, catalin.marinas@arm.com,
	will.deacon@arm.com, robert.moore@intel.com,
	paul.gortmaker@windriver.com, lv.zheng@intel.com,
	kvmarm@lists.cs.columbia.edu, fu.wei@linaro.org,
	rafael@kernel.org, zjzhang@codeaurora.org, linux@armlinux.org.uk,
	gengdongjiu@huawei.com, linux-acpi@vger.kernel.org,
	eun.taik.lee@samsung.com, shijie.huang@arm.com,
	labbott@redhat.com, lenb@kernel.org, harba@codeaurora.org,
	john.garry@huawei.com, marc.zyngier@arm.com,
	punit.agrawal@arm.com, rostedt@goodmis.org, nkaje@codeaurora.org,
	sandeepa.s.prabhu@gmail.com,
	linux-arm-kernel@lists.infradead.org, devel@acpica.org,
	tony.luck@intel.com, rjw@rjwysocki.net, rruigrok@codeaurora.org,
	linux-kernel@vger.kernel.org, astone@redhat.com,
	hanjun.guo@linaro.org, joe@perches.com, pbonzini@redhat.com,
	akpm@linux-foundation.org, bristot@redhat.com
Subject: Re: [PATCH V15 03/11] cper: add timestamp print to CPER status printing
Date: Fri, 21 Apr 2017 19:26:03 +0200	[thread overview]
Message-ID: <20170421172603.4574wonnm5tgvbcn@pd.tnic> (raw)
In-Reply-To: <35cc4ae0-e8fa-fd3a-5d7f-243ed2e82ea0@codeaurora.org>

On Fri, Apr 21, 2017 at 10:04:35AM -0600, Baicar, Tyler wrote:
> This is basically what I already had in v14...you asked to move it into a
> different if-statement? https://lkml.org/lkml/2017/4/12/397

Well, clearly I've been smoking some nasty potent sh*t. :-\

/me goes and looks at the spec:

"Bit 0 – Timestamp is precise if this bit is set and correlates to the
time of the error event."

So why are we even printing the timestamp when !precise?

IOW, I think we should do:

	if (!(timestamp[3] & 0x1))
		printk("%stimestamp imprecise\n", pfx);
	else {
		sec = ..
		min = ...

		...
	}

and print the actual values only when the timestamp is precise.
Otherwise it has *some* values which could just as well be completely
random. And it's not like we're reporting the error tomorrow - it is
mostly a couple of seconds from logging to the fw pushing it out...

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.
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WARNING: multiple messages have this Message-ID (diff)
From: Borislav Petkov <bp@alien8.de>
To: "Baicar, Tyler" <tbaicar@codeaurora.org>
Cc: christoffer.dall@linaro.org, marc.zyngier@arm.com,
	pbonzini@redhat.com, rkrcmar@redhat.com, linux@armlinux.org.uk,
	catalin.marinas@arm.com, will.deacon@arm.com, rjw@rjwysocki.net,
	lenb@kernel.org, matt@codeblueprint.co.uk,
	robert.moore@intel.com, lv.zheng@intel.com, nkaje@codeaurora.org,
	zjzhang@codeaurora.org, mark.rutland@arm.com,
	james.morse@arm.com, akpm@linux-foundation.org,
	eun.taik.lee@samsung.com, sandeepa.s.prabhu@gmail.com,
	labbott@redhat.com, shijie.huang@arm.com,
	rruigrok@codeaurora.org, paul.gortmaker@windriver.com,
	tn@semihalf.com, fu.wei@linaro.org, rostedt@goodmis.org,
	bristot@redhat.com, linux-arm-kernel@lists.infradead.org,
	kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
	linux-efi@vger.kernel.org, devel@acpica.org,
	Suzuki.Poulose@arm.com, punit.agrawal@arm.com, astone@redhat.com,
	harba@codeaurora.org, hanjun.guo@linaro.org,
	john.garry@huawei.com, shiju.jose@huawei.com, joe@perches.com,
	rafael@kernel.org, tony.luck@intel.com, gengdongjiu@huawei.com,
	xiexiuqi@huawei.com
Subject: Re: [PATCH V15 03/11] cper: add timestamp print to CPER status printing
Date: Fri, 21 Apr 2017 19:26:03 +0200	[thread overview]
Message-ID: <20170421172603.4574wonnm5tgvbcn@pd.tnic> (raw)
In-Reply-To: <35cc4ae0-e8fa-fd3a-5d7f-243ed2e82ea0@codeaurora.org>

On Fri, Apr 21, 2017 at 10:04:35AM -0600, Baicar, Tyler wrote:
> This is basically what I already had in v14...you asked to move it into a
> different if-statement? https://lkml.org/lkml/2017/4/12/397

Well, clearly I've been smoking some nasty potent sh*t. :-\

/me goes and looks at the spec:

"Bit 0 – Timestamp is precise if this bit is set and correlates to the
time of the error event."

So why are we even printing the timestamp when !precise?

IOW, I think we should do:

	if (!(timestamp[3] & 0x1))
		printk("%stimestamp imprecise\n", pfx);
	else {
		sec = ..
		min = ...

		...
	}

and print the actual values only when the timestamp is precise.
Otherwise it has *some* values which could just as well be completely
random. And it's not like we're reporting the error tomorrow - it is
mostly a couple of seconds from logging to the fw pushing it out...

-- 
Regards/Gruss,
    Boris.

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

WARNING: multiple messages have this Message-ID (diff)
From: bp@alien8.de (Borislav Petkov)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH V15 03/11] cper: add timestamp print to CPER status printing
Date: Fri, 21 Apr 2017 19:26:03 +0200	[thread overview]
Message-ID: <20170421172603.4574wonnm5tgvbcn@pd.tnic> (raw)
In-Reply-To: <35cc4ae0-e8fa-fd3a-5d7f-243ed2e82ea0@codeaurora.org>

On Fri, Apr 21, 2017 at 10:04:35AM -0600, Baicar, Tyler wrote:
> This is basically what I already had in v14...you asked to move it into a
> different if-statement? https://lkml.org/lkml/2017/4/12/397

Well, clearly I've been smoking some nasty potent sh*t. :-\

/me goes and looks at the spec:

"Bit 0 ? Timestamp is precise if this bit is set and correlates to the
time of the error event."

So why are we even printing the timestamp when !precise?

IOW, I think we should do:

	if (!(timestamp[3] & 0x1))
		printk("%stimestamp imprecise\n", pfx);
	else {
		sec = ..
		min = ...

		...
	}

and print the actual values only when the timestamp is precise.
Otherwise it has *some* values which could just as well be completely
random. And it's not like we're reporting the error tomorrow - it is
mostly a couple of seconds from logging to the fw pushing it out...

-- 
Regards/Gruss,
    Boris.

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

  reply	other threads:[~2017-04-21 17:26 UTC|newest]

Thread overview: 132+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-04-18 23:05 [PATCH V15 00/11] Add UEFI 2.6 and ACPI 6.1 updates for RAS on ARM64 Tyler Baicar
2017-04-18 23:05 ` Tyler Baicar
2017-04-18 23:05 ` Tyler Baicar
2017-04-18 23:05 ` Tyler Baicar
2017-04-18 23:05 ` [PATCH V15 01/11] acpi: apei: read ack upon ghes record consumption Tyler Baicar
2017-04-18 23:05   ` Tyler Baicar
2017-04-18 23:05   ` Tyler Baicar
     [not found]   ` <1492556723-9189-2-git-send-email-tbaicar-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2017-04-19 18:31     ` Borislav Petkov
2017-04-19 18:31       ` Borislav Petkov
2017-04-19 18:31       ` Borislav Petkov
2017-04-19 18:31       ` Borislav Petkov
     [not found]       ` <20170419183112.x7tmjzpoq7ds64s2-fF5Pk5pvG8Y@public.gmane.org>
2017-04-19 20:31         ` Baicar, Tyler
2017-04-19 20:31           ` Baicar, Tyler
2017-04-19 20:31           ` Baicar, Tyler
2017-04-19 20:31           ` Baicar, Tyler
2017-04-19 20:41           ` Borislav Petkov
2017-04-19 20:41             ` Borislav Petkov
2017-04-19 20:41             ` Borislav Petkov
2017-04-19 20:41             ` Borislav Petkov
2017-04-18 23:05 ` [PATCH V15 02/11] ras: acpi/apei: cper: add support for generic data v3 structure Tyler Baicar
2017-04-18 23:05   ` Tyler Baicar
2017-04-18 23:05   ` Tyler Baicar
     [not found]   ` <1492556723-9189-3-git-send-email-tbaicar-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2017-04-20 11:14     ` Borislav Petkov
2017-04-20 11:14       ` Borislav Petkov
2017-04-20 11:14       ` Borislav Petkov
2017-04-20 11:14       ` Borislav Petkov
2017-04-18 23:05 ` [PATCH V15 03/11] cper: add timestamp print to CPER status printing Tyler Baicar
2017-04-18 23:05   ` Tyler Baicar
2017-04-18 23:05   ` Tyler Baicar
2017-04-21 12:21   ` Borislav Petkov
2017-04-21 12:21     ` Borislav Petkov
2017-04-21 12:21     ` Borislav Petkov
2017-04-21 16:04     ` Baicar, Tyler
2017-04-21 16:04       ` Baicar, Tyler
2017-04-21 16:04       ` Baicar, Tyler
2017-04-21 17:26       ` Borislav Petkov [this message]
2017-04-21 17:26         ` Borislav Petkov
2017-04-21 17:26         ` Borislav Petkov
2017-04-21 18:08         ` Baicar, Tyler
2017-04-21 18:08           ` Baicar, Tyler
2017-04-21 18:08           ` Baicar, Tyler
2017-04-21 18:12           ` Borislav Petkov
2017-04-21 18:12             ` Borislav Petkov
2017-04-21 18:12             ` Borislav Petkov
2017-04-18 23:05 ` [PATCH V15 04/11] efi: parse ARM processor error Tyler Baicar
2017-04-18 23:05   ` Tyler Baicar
2017-04-18 23:05   ` Tyler Baicar
2017-04-21 17:55   ` Borislav Petkov
2017-04-21 17:55     ` Borislav Petkov
2017-04-21 17:55     ` Borislav Petkov
2017-04-21 18:22     ` Baicar, Tyler
2017-04-21 18:22       ` Baicar, Tyler
2017-04-21 18:22       ` Baicar, Tyler
2017-04-24 17:52       ` Borislav Petkov
2017-04-24 17:52         ` Borislav Petkov
2017-04-24 17:52         ` Borislav Petkov
2017-04-25 16:05         ` Baicar, Tyler
2017-04-25 16:05           ` Baicar, Tyler
2017-04-25 16:05           ` Baicar, Tyler
2017-04-25 16:31           ` Borislav Petkov
2017-04-25 16:31             ` Borislav Petkov
2017-04-25 16:31             ` Borislav Petkov
2017-04-18 23:05 ` [PATCH V15 05/11] arm64: exception: handle Synchronous External Abort Tyler Baicar
2017-04-18 23:05   ` Tyler Baicar
2017-04-18 23:05   ` Tyler Baicar
2017-04-18 23:05 ` [PATCH V15 06/11] acpi: apei: handle SEA notification type for ARMv8 Tyler Baicar
2017-04-18 23:05   ` Tyler Baicar
2017-04-18 23:05   ` Tyler Baicar
2017-04-25 17:21   ` Borislav Petkov
2017-04-25 17:21     ` Borislav Petkov
2017-04-25 17:21     ` Borislav Petkov
2017-04-25 17:41     ` Baicar, Tyler
2017-04-25 17:41       ` Baicar, Tyler
2017-04-25 17:41       ` Baicar, Tyler
2017-04-25 17:41       ` Baicar, Tyler
2017-04-25 17:46       ` Borislav Petkov
2017-04-25 17:46         ` Borislav Petkov
2017-04-25 17:46         ` Borislav Petkov
2017-05-08 17:28   ` James Morse
2017-05-08 17:28     ` James Morse
2017-05-08 17:28     ` James Morse
     [not found]     ` <5910AAB8.8070703-5wv7dgnIgG8@public.gmane.org>
2017-05-08 19:59       ` Baicar, Tyler
2017-05-08 19:59         ` Baicar, Tyler
2017-05-08 19:59         ` Baicar, Tyler
2017-05-12 16:45         ` James Morse
2017-05-12 16:45           ` James Morse
2017-05-12 16:45           ` James Morse
     [not found]   ` <1492556723-9189-7-git-send-email-tbaicar-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2017-08-14  7:55     ` Xiongfeng Wang
2017-08-14  7:55   ` Xiongfeng Wang
2017-08-14  7:55     ` Xiongfeng Wang
2017-08-14  7:55     ` Xiongfeng Wang
2017-08-14  7:55     ` Xiongfeng Wang
2017-04-18 23:05 ` [PATCH V15 07/11] acpi: apei: panic OS with fatal error status block Tyler Baicar
2017-04-18 23:05   ` Tyler Baicar
2017-04-18 23:05   ` Tyler Baicar
2017-04-28 13:07   ` Borislav Petkov
2017-04-28 13:07     ` Borislav Petkov
2017-04-28 13:07     ` Borislav Petkov
2017-04-18 23:05 ` [PATCH V15 08/11] efi: print unrecognized CPER section Tyler Baicar
2017-04-18 23:05   ` Tyler Baicar
2017-04-18 23:05   ` Tyler Baicar
2017-05-05 13:27   ` Borislav Petkov
2017-05-05 13:27     ` Borislav Petkov
2017-05-05 13:27     ` Borislav Petkov
2017-04-18 23:05 ` [PATCH V15 09/11] ras: acpi / apei: generate trace event for " Tyler Baicar
2017-04-18 23:05   ` Tyler Baicar
2017-04-18 23:05   ` Tyler Baicar
2017-05-05 17:53   ` Borislav Petkov
2017-05-05 17:53     ` Borislav Petkov
2017-05-05 17:53     ` Borislav Petkov
2017-05-05 18:44   ` Steven Rostedt
2017-05-05 18:44     ` Steven Rostedt
2017-05-05 18:44     ` Steven Rostedt
2017-04-18 23:05 ` [PATCH V15 10/11] trace, ras: add ARM processor error trace event Tyler Baicar
2017-04-18 23:05   ` Tyler Baicar
2017-04-18 23:05   ` Tyler Baicar
2017-05-08 17:34   ` Borislav Petkov
2017-05-08 17:34     ` Borislav Petkov
2017-05-08 17:34     ` Borislav Petkov
2017-04-18 23:05 ` [PATCH V15 11/11] arm/arm64: KVM: add guest SEA support Tyler Baicar
2017-04-18 23:05   ` Tyler Baicar
2017-04-18 23:05   ` Tyler Baicar
2017-05-08 17:40   ` Borislav Petkov
2017-05-08 17:40     ` Borislav Petkov
2017-05-08 17:40     ` Borislav Petkov
2017-05-08 19:54     ` Baicar, Tyler
2017-05-08 19:54       ` Baicar, Tyler
2017-05-08 19:54       ` Baicar, Tyler
2017-05-08 19:54       ` Baicar, Tyler
2017-05-08 20:22       ` Borislav Petkov
2017-05-08 20:22         ` Borislav Petkov
2017-05-08 20:22         ` Borislav Petkov

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