From: Borislav Petkov <bp@alien8.de>
To: "Guilherme G. Piccoli" <gpiccoli@igalia.com>
Cc: akpm@linux-foundation.org, bhe@redhat.com, pmladek@suse.com,
kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
linux-hyperv@vger.kernel.org, netdev@vger.kernel.org,
x86@kernel.org, kernel-dev@igalia.com, kernel@gpiccoli.net,
halves@canonical.com, fabiomirmar@gmail.com,
alejandro.j.jimenez@oracle.com,
andriy.shevchenko@linux.intel.com, arnd@arndb.de, corbet@lwn.net,
d.hatayama@jp.fujitsu.com, dave.hansen@linux.intel.com,
dyoung@redhat.com, feng.tang@intel.com,
gregkh@linuxfoundation.org, mikelley@microsoft.com,
hidehiro.kawai.ez@hitachi.com, jgross@suse.com,
john.ogness@linutronix.de, keescook@chromium.org,
luto@kernel.org, mhiramat@kernel.org, mingo@redhat.com,
paulmck@kernel.org, peterz@infradead.org, rostedt@goodmis.org,
senozhatsky@chromium.org, stern@rowland.harvard.edu,
tglx@linutronix.de, vgoyal@redhat.com, vkuznets@redhat.com,
will@kernel.org, linux-edac@vger.kernel.org,
Dinh Nguyen <dinguyen@kernel.org>,
Tony Luck <tony.luck@intel.com>
Subject: Re: [PATCH v2 10/13] EDAC/altera: Skip the panic notifier if kdump is loaded
Date: Wed, 17 Aug 2022 23:02:13 +0200 [thread overview]
Message-ID: <Yv1XVRmTXHLhOkER@zn.tnic> (raw)
In-Reply-To: <7f016d7f-a546-a45d-c65c-bc35269b4faa@igalia.com>
On Wed, Aug 17, 2022 at 05:28:34PM -0300, Guilherme G. Piccoli wrote:
> My understanding is the same as yours, i.e., this is not possible to
> collect from vmcore, it requires register reading. But again: if you
> kdump your machine today, you won't collect this information, patch
> changed nothing in that regard.
Why won't you be able to collect it? You can certainly access dmesg in
the vmcore and see those errors logged there.
> The one thing it changes is that you'd skip the altera register dump if
> kdump is set AND you managed to also set "crash_kexec_post_notifiers".
What your patch changes is, it prevents s10_edac_dberr_handler() from
logging potentially important fatal hw errors when kdump is loaded.
If Dinh is fine with that, I'll take the patch. But it looks like a bad
idea to me.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
WARNING: multiple messages have this Message-ID (diff)
From: Borislav Petkov <bp@alien8.de>
To: "Guilherme G. Piccoli" <gpiccoli@igalia.com>
Cc: akpm@linux-foundation.org, bhe@redhat.com, pmladek@suse.com,
kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
linux-hyperv@vger.kernel.org, netdev@vger.kernel.org,
x86@kernel.org, kernel-dev@igalia.com, kernel@gpiccoli.net,
halves@canonical.com, fabiomirmar@gmail.com,
alejandro.j.jimenez@oracle.com,
andriy.shevchenko@linux.intel.com, arnd@arndb.de, corbet@lwn.net,
d.hatayama@jp.fujitsu.com, dave.hansen@linux.intel.com,
dyoung@redhat.com, feng.tang@intel.com,
gregkh@linuxfoundation.org, mikelley@microsoft.com,
hidehiro.kawai.ez@hitachi.com, jgross@suse.com,
john.ogness@linutronix.de, keescook@chromium.org,
luto@kernel.org, mhiramat@kernel.org, mingo@redhat.com,
paulmck@kernel.org, peterz@infradead.org, rostedt@goodmis.org,
senozhatsky@chromium.org, stern@rowland.harvard.edu,
tglx@linutronix.de, vgoyal@redhat.com, vkuznets@redhat.com,
will@kernel.org, linux-edac@vger.kernel.org,
Dinh Nguyen <dinguyen@kernel.org>,
Tony Luck <tony.luck@intel.com>
Subject: Re: [PATCH v2 10/13] EDAC/altera: Skip the panic notifier if kdump is loaded
Date: Wed, 17 Aug 2022 23:02:13 +0200 [thread overview]
Message-ID: <Yv1XVRmTXHLhOkER@zn.tnic> (raw)
In-Reply-To: <7f016d7f-a546-a45d-c65c-bc35269b4faa@igalia.com>
On Wed, Aug 17, 2022 at 05:28:34PM -0300, Guilherme G. Piccoli wrote:
> My understanding is the same as yours, i.e., this is not possible to
> collect from vmcore, it requires register reading. But again: if you
> kdump your machine today, you won't collect this information, patch
> changed nothing in that regard.
Why won't you be able to collect it? You can certainly access dmesg in
the vmcore and see those errors logged there.
> The one thing it changes is that you'd skip the altera register dump if
> kdump is set AND you managed to also set "crash_kexec_post_notifiers".
What your patch changes is, it prevents s10_edac_dberr_handler() from
logging potentially important fatal hw errors when kdump is loaded.
If Dinh is fine with that, I'll take the patch. But it looks like a bad
idea to me.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
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next prev parent reply other threads:[~2022-08-17 21:02 UTC|newest]
Thread overview: 142+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-19 19:53 [PATCH v2 00/13] The panic notifiers refactor strikes back - fixes/clean-ups Guilherme G. Piccoli
2022-07-19 19:53 ` Guilherme G. Piccoli
2022-07-19 19:53 ` Guilherme G. Piccoli
2022-07-19 19:53 ` Guilherme G. Piccoli
2022-07-19 19:53 ` Guilherme G. Piccoli
2022-07-19 19:53 ` [PATCH v2 01/13] ARM: Disable FIQs (but not IRQs) on CPUs shutdown paths Guilherme G. Piccoli
2022-07-19 19:53 ` Guilherme G. Piccoli
2022-07-19 19:53 ` Guilherme G. Piccoli
2022-08-07 15:35 ` Guilherme G. Piccoli
2022-08-07 15:35 ` Guilherme G. Piccoli
2022-08-07 15:35 ` Guilherme G. Piccoli
2022-07-19 19:53 ` [PATCH v2 02/13] notifier: Add panic notifiers info and purge trailing whitespaces Guilherme G. Piccoli
2022-07-19 19:53 ` Guilherme G. Piccoli
2022-08-03 9:21 ` Baoquan He
2022-08-03 9:21 ` Baoquan He
2022-07-19 19:53 ` [PATCH v2 03/13] firmware: google: Test spinlock on panic path to avoid lockups Guilherme G. Piccoli
2022-07-19 19:53 ` Guilherme G. Piccoli
2022-08-07 15:38 ` Guilherme G. Piccoli
2022-08-07 15:38 ` Guilherme G. Piccoli
2022-08-08 5:07 ` Evan Green
2022-08-08 5:07 ` Evan Green
2022-08-08 15:14 ` Guilherme G. Piccoli
2022-08-08 15:14 ` Guilherme G. Piccoli
2022-08-08 15:26 ` Greg Kroah-Hartman
2022-08-08 15:26 ` Greg Kroah-Hartman
2022-08-08 15:37 ` Guilherme G. Piccoli
2022-08-08 15:37 ` Guilherme G. Piccoli
2022-08-10 12:54 ` Greg Kroah-Hartman
2022-08-10 12:54 ` Greg Kroah-Hartman
2022-07-19 19:53 ` [PATCH v2 04/13] soc: bcm: brcmstb: Document panic notifier action and remove useless header Guilherme G. Piccoli
2022-07-19 19:53 ` Guilherme G. Piccoli
2022-07-20 23:00 ` Florian Fainelli
2022-07-20 23:00 ` Florian Fainelli
2022-07-21 13:17 ` Guilherme G. Piccoli
2022-07-21 13:17 ` Guilherme G. Piccoli
2022-07-19 19:53 ` [PATCH v2 05/13] alpha: Clean-up the panic notifier code Guilherme G. Piccoli
2022-07-19 19:53 ` Guilherme G. Piccoli
2022-07-19 19:53 ` Guilherme G. Piccoli
2022-07-19 19:53 ` [PATCH v2 06/13] um: Improve panic notifiers consistency and ordering Guilherme G. Piccoli
2022-07-19 19:53 ` Guilherme G. Piccoli
2022-07-19 19:53 ` Guilherme G. Piccoli
2022-08-07 15:40 ` Guilherme G. Piccoli
2022-08-07 15:40 ` Guilherme G. Piccoli
2022-08-07 15:40 ` Guilherme G. Piccoli
2022-08-09 18:09 ` Johannes Berg
2022-08-09 18:09 ` Johannes Berg
2022-08-09 18:09 ` Johannes Berg
2022-08-09 19:03 ` Guilherme G. Piccoli
2022-08-09 19:03 ` Guilherme G. Piccoli
2022-08-09 19:03 ` Guilherme G. Piccoli
2022-08-09 19:08 ` Johannes Berg
2022-08-09 19:08 ` Johannes Berg
2022-08-09 19:08 ` Johannes Berg
2022-08-09 19:45 ` Guilherme G. Piccoli
2022-08-09 19:45 ` Guilherme G. Piccoli
2022-08-09 19:45 ` Guilherme G. Piccoli
2022-07-19 19:53 ` [PATCH v2 07/13] parisc: Replace regular spinlock with spin_trylock on panic path Guilherme G. Piccoli
2022-07-19 19:53 ` Guilherme G. Piccoli
2022-07-20 1:43 ` Jeroen Roovers
2022-07-20 1:43 ` Jeroen Roovers
2022-07-21 13:19 ` Guilherme G. Piccoli
2022-07-21 13:19 ` Guilherme G. Piccoli
2022-07-21 13:45 ` Helge Deller
2022-07-21 13:45 ` Helge Deller
2022-07-21 14:00 ` Guilherme G. Piccoli
2022-07-21 14:00 ` Guilherme G. Piccoli
2022-07-19 19:53 ` [PATCH v2 08/13] tracing: Improve panic/die notifiers Guilherme G. Piccoli
2022-07-19 19:53 ` Guilherme G. Piccoli
2022-08-03 9:36 ` Baoquan He
2022-08-03 9:36 ` Baoquan He
2022-08-03 9:52 ` Baoquan He
2022-08-03 9:52 ` Baoquan He
2022-08-03 11:44 ` Guilherme G. Piccoli
2022-08-03 11:44 ` Guilherme G. Piccoli
2022-08-07 15:46 ` Guilherme G. Piccoli
2022-08-07 15:46 ` Guilherme G. Piccoli
2022-08-16 14:14 ` Steven Rostedt
2022-08-16 14:14 ` Steven Rostedt
2022-08-16 14:57 ` Alan Stern
2022-08-16 14:57 ` Alan Stern
2022-08-16 15:52 ` Steven Rostedt
2022-08-16 15:52 ` Steven Rostedt
2022-08-16 20:12 ` Guilherme G. Piccoli
2022-08-16 20:12 ` Guilherme G. Piccoli
2022-07-19 19:53 ` [PATCH v2 09/13] notifier: Show function names on notifier routines if DEBUG_NOTIFIERS is set Guilherme G. Piccoli
2022-07-19 19:53 ` Guilherme G. Piccoli
2022-07-19 20:33 ` Arjan van de Ven
2022-07-19 20:33 ` Arjan van de Ven
2022-07-19 20:44 ` Guilherme G. Piccoli
2022-07-19 20:44 ` Guilherme G. Piccoli
2022-07-19 20:48 ` Arjan van de Ven
2022-07-19 20:48 ` Arjan van de Ven
2022-07-19 21:00 ` Guilherme G. Piccoli
2022-07-19 21:00 ` Guilherme G. Piccoli
2022-07-19 22:04 ` Arjan van de Ven
2022-07-19 22:04 ` Arjan van de Ven
2022-07-21 13:20 ` Guilherme G. Piccoli
2022-07-21 13:20 ` Guilherme G. Piccoli
2022-07-19 19:53 ` [PATCH v2 10/13] EDAC/altera: Skip the panic notifier if kdump is loaded Guilherme G. Piccoli
2022-07-19 19:53 ` Guilherme G. Piccoli
2022-08-07 15:48 ` Guilherme G. Piccoli
2022-08-07 15:48 ` Guilherme G. Piccoli
2022-08-16 18:44 ` Dinh Nguyen
2022-08-16 18:44 ` Dinh Nguyen
2022-08-16 20:16 ` Guilherme G. Piccoli
2022-08-16 20:16 ` Guilherme G. Piccoli
2022-08-17 17:31 ` Borislav Petkov
2022-08-17 17:31 ` Borislav Petkov
2022-08-17 18:45 ` Guilherme G. Piccoli
2022-08-17 18:45 ` Guilherme G. Piccoli
2022-08-17 19:34 ` Borislav Petkov
2022-08-17 19:34 ` Borislav Petkov
2022-08-17 20:28 ` Guilherme G. Piccoli
2022-08-17 20:28 ` Guilherme G. Piccoli
2022-08-17 21:02 ` Borislav Petkov [this message]
2022-08-17 21:02 ` Borislav Petkov
2022-08-17 21:39 ` Guilherme G. Piccoli
2022-08-17 21:39 ` Guilherme G. Piccoli
2022-08-17 21:46 ` Borislav Petkov
2022-08-17 21:46 ` Borislav Petkov
2022-08-17 21:56 ` Guilherme G. Piccoli
2022-08-17 21:56 ` Guilherme G. Piccoli
2022-08-17 22:00 ` Borislav Petkov
2022-08-17 22:00 ` Borislav Petkov
2022-08-17 22:09 ` Guilherme G. Piccoli
2022-08-17 22:09 ` Guilherme G. Piccoli
2022-08-17 22:19 ` Borislav Petkov
2022-08-17 22:19 ` Borislav Petkov
2022-08-17 22:49 ` Guilherme G. Piccoli
2022-08-17 22:49 ` Guilherme G. Piccoli
2022-07-19 19:53 ` [PATCH v2 11/13] video/hyperv_fb: Avoid taking busy spinlock on panic path Guilherme G. Piccoli
2022-07-19 19:53 ` Guilherme G. Piccoli
2022-07-25 18:09 ` Michael Kelley (LINUX)
2022-07-25 18:09 ` Michael Kelley (LINUX)
2022-07-25 22:05 ` Guilherme G. Piccoli
2022-07-25 22:05 ` Guilherme G. Piccoli
2022-07-19 19:53 ` [PATCH v2 12/13] drivers/hv/vmbus, video/hyperv_fb: Untangle and refactor Hyper-V panic notifiers Guilherme G. Piccoli
2022-07-19 19:53 ` Guilherme G. Piccoli
2022-07-25 18:55 ` Michael Kelley (LINUX)
2022-07-25 18:55 ` Michael Kelley (LINUX)
2022-07-19 19:53 ` [PATCH v2 13/13] panic: Fixes the panic_print NMI backtrace setting Guilherme G. Piccoli
2022-07-19 19:53 ` Guilherme G. Piccoli
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