From: mbrugger@suse.com (Matthias Brugger)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v26 6/7] arm64: kdump: update a kernel doc
Date: Mon, 26 Sep 2016 19:21:23 +0200 [thread overview]
Message-ID: <f75df607-fc9c-005f-8311-8c173541f37a@suse.com> (raw)
In-Reply-To: <57DC18FC.9000807@arm.com>
On 16/09/16 18:08, James Morse wrote:
> Hi Akashi,
>
> On 07/09/16 05:29, AKASHI Takahiro wrote:
>> This patch adds arch specific descriptions about kdump usage on arm64
>> to kdump.txt.
>
>> diff --git a/Documentation/kdump/kdump.txt b/Documentation/kdump/kdump.txt
>
>> @@ -249,6 +249,13 @@ Dump-capture kernel config options (Arch Dependent, arm)
>>
>> AUTO_ZRELADDR=y
>>
>> +Dump-capture kernel config options (Arch Dependent, arm64)
>> +----------------------------------------------------------
>> +
>> +- Please note that kvm of the dump-capture kernel will not be enabled
>> + on non-VHE systems even if it is configured. This is because the CPU
>> + cannot be reset to EL2 on panic.
>
> Nit:
> cannot be -> will not be
>
> We could try to do this, but its more code that could prevent us reaching the
> kdump kernel, so we choose not to.
>
>
>> @@ -370,6 +381,9 @@ For s390x:
>> For arm:
>> "1 maxcpus=1 reset_devices"
>>
>> +For arm64:
>> + "1 maxcpus=1 reset_devices"
>> +
>
> 'maxcpus=1' is a bit fragile. Since 44dbcc93ab67145 ("arm64: Fix behavior of
> maxcpus=N") udev on ubuntu vivid (running on Juno) has taken it upon itself to
> bring the secondary cores online, even when booted with 'maxcpus=1'.
>
This looks pretty much like a bug to me and should get fixed on their site.
> Can we change the recomendation to "1 nosmp reset_devices"?
>
>
> Thanks,
>
> James
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel at lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>
WARNING: multiple messages have this Message-ID (diff)
From: Matthias Brugger <mbrugger@suse.com>
To: James Morse <james.morse@arm.com>,
AKASHI Takahiro <takahiro.akashi@linaro.org>
Cc: mark.rutland@arm.com, geoff@infradead.org,
catalin.marinas@arm.com, will.deacon@arm.com,
bauerman@linux.vnet.ibm.com, dyoung@redhat.com,
kexec@lists.infradead.org, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v26 6/7] arm64: kdump: update a kernel doc
Date: Mon, 26 Sep 2016 19:21:23 +0200 [thread overview]
Message-ID: <f75df607-fc9c-005f-8311-8c173541f37a@suse.com> (raw)
In-Reply-To: <57DC18FC.9000807@arm.com>
On 16/09/16 18:08, James Morse wrote:
> Hi Akashi,
>
> On 07/09/16 05:29, AKASHI Takahiro wrote:
>> This patch adds arch specific descriptions about kdump usage on arm64
>> to kdump.txt.
>
>> diff --git a/Documentation/kdump/kdump.txt b/Documentation/kdump/kdump.txt
>
>> @@ -249,6 +249,13 @@ Dump-capture kernel config options (Arch Dependent, arm)
>>
>> AUTO_ZRELADDR=y
>>
>> +Dump-capture kernel config options (Arch Dependent, arm64)
>> +----------------------------------------------------------
>> +
>> +- Please note that kvm of the dump-capture kernel will not be enabled
>> + on non-VHE systems even if it is configured. This is because the CPU
>> + cannot be reset to EL2 on panic.
>
> Nit:
> cannot be -> will not be
>
> We could try to do this, but its more code that could prevent us reaching the
> kdump kernel, so we choose not to.
>
>
>> @@ -370,6 +381,9 @@ For s390x:
>> For arm:
>> "1 maxcpus=1 reset_devices"
>>
>> +For arm64:
>> + "1 maxcpus=1 reset_devices"
>> +
>
> 'maxcpus=1' is a bit fragile. Since 44dbcc93ab67145 ("arm64: Fix behavior of
> maxcpus=N") udev on ubuntu vivid (running on Juno) has taken it upon itself to
> bring the secondary cores online, even when booted with 'maxcpus=1'.
>
This looks pretty much like a bug to me and should get fixed on their site.
> Can we change the recomendation to "1 nosmp reset_devices"?
>
>
> Thanks,
>
> James
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>
_______________________________________________
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec
next prev parent reply other threads:[~2016-09-26 17:21 UTC|newest]
Thread overview: 90+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-07 4:29 [PATCH v26 0/7] arm64: add kdump support AKASHI Takahiro
2016-09-07 4:29 ` AKASHI Takahiro
2016-09-07 4:29 ` [PATCH v26 1/7] arm64: kdump: reserve memory for crash dump kernel AKASHI Takahiro
2016-09-07 4:29 ` AKASHI Takahiro
2016-09-22 10:23 ` Matthias Bruger
2016-09-22 10:23 ` Matthias Bruger
2016-09-23 8:37 ` AKASHI Takahiro
2016-09-23 8:37 ` AKASHI Takahiro
2016-09-07 4:29 ` [PATCH v26 2/7] arm64: kdump: implement machine_crash_shutdown() AKASHI Takahiro
2016-09-07 4:29 ` AKASHI Takahiro
2016-09-14 18:09 ` James Morse
2016-09-14 18:09 ` James Morse
2016-09-15 8:13 ` Marc Zyngier
2016-09-15 8:13 ` Marc Zyngier
2016-09-16 3:21 ` AKASHI Takahiro
2016-09-16 3:21 ` AKASHI Takahiro
2016-09-16 14:49 ` James Morse
2016-09-16 14:49 ` James Morse
2016-09-20 7:36 ` AKASHI Takahiro
2016-09-20 7:36 ` AKASHI Takahiro
2016-09-07 4:29 ` [PATCH v26 3/7] arm64: kdump: add kdump support AKASHI Takahiro
2016-09-07 4:29 ` AKASHI Takahiro
2016-09-16 14:50 ` James Morse
2016-09-16 14:50 ` James Morse
2016-09-20 7:46 ` AKASHI Takahiro
2016-09-20 7:46 ` AKASHI Takahiro
2016-09-22 15:50 ` Matthias Brugger
2016-09-22 15:50 ` Matthias Brugger
2016-09-07 4:29 ` [PATCH v26 4/7] arm64: kdump: add VMCOREINFO's for user-space coredump tools AKASHI Takahiro
2016-09-07 4:29 ` AKASHI Takahiro
2016-09-16 16:04 ` James Morse
2016-09-16 16:04 ` James Morse
2016-09-07 4:29 ` [PATCH v26 5/7] arm64: kdump: enable kdump in the arm64 defconfig AKASHI Takahiro
2016-09-07 4:29 ` AKASHI Takahiro
2016-09-07 4:29 ` [PATCH v26 6/7] arm64: kdump: update a kernel doc AKASHI Takahiro
2016-09-07 4:29 ` AKASHI Takahiro
2016-09-16 16:08 ` James Morse
2016-09-16 16:08 ` James Morse
2016-09-20 8:27 ` AKASHI Takahiro
2016-09-20 8:27 ` AKASHI Takahiro
2016-09-26 17:21 ` Matthias Brugger [this message]
2016-09-26 17:21 ` Matthias Brugger
[not found] ` <20160907042908.6232-1-takahiro.akashi-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2016-09-07 4:32 ` [PATCH v26 7/7] Documentation: dt: chosen properties for arm64 kdump AKASHI Takahiro
2016-09-07 4:32 ` AKASHI Takahiro
2016-09-07 4:32 ` AKASHI Takahiro
[not found] ` <20160907043203.6309-1-takahiro.akashi-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2016-09-16 13:03 ` Rob Herring
2016-09-16 13:03 ` Rob Herring
2016-09-16 13:03 ` Rob Herring
2016-09-07 4:37 ` [PATCH v26 0/7] arm64: add kdump support AKASHI Takahiro
2016-09-07 4:37 ` AKASHI Takahiro
2016-09-16 16:04 ` James Morse
2016-09-16 16:04 ` James Morse
2016-09-16 20:17 ` Ard Biesheuvel
2016-09-16 20:17 ` Ard Biesheuvel
2016-09-19 16:05 ` James Morse
2016-09-19 16:05 ` James Morse
2016-09-19 16:10 ` Ard Biesheuvel
2016-09-19 16:10 ` Ard Biesheuvel
2016-09-21 7:42 ` AKASHI Takahiro
2016-09-21 7:42 ` AKASHI Takahiro
2016-09-21 7:33 ` AKASHI Takahiro
2016-09-21 7:33 ` AKASHI Takahiro
2016-10-03 7:54 ` Manish Jaggi
2016-10-03 7:54 ` Manish Jaggi
2016-10-03 11:04 ` AKASHI Takahiro
2016-10-03 11:04 ` AKASHI Takahiro
2016-10-03 12:41 ` Manish Jaggi
2016-10-03 12:41 ` Manish Jaggi
2016-10-04 2:56 ` AKASHI Takahiro
2016-10-04 2:56 ` AKASHI Takahiro
2016-10-04 9:46 ` James Morse
2016-10-04 9:46 ` James Morse
2016-10-04 10:05 ` Manish Jaggi
2016-10-04 10:05 ` Manish Jaggi
2016-10-04 10:53 ` James Morse
2016-10-04 10:53 ` James Morse
2016-10-04 13:23 ` Manish Jaggi
2016-10-04 13:23 ` Manish Jaggi
2016-10-05 5:48 ` AKASHI Takahiro
2016-10-05 5:48 ` AKASHI Takahiro
2016-10-05 5:41 ` AKASHI Takahiro
2016-10-05 5:41 ` AKASHI Takahiro
2016-10-04 10:18 ` Mark Rutland
2016-10-04 10:18 ` Mark Rutland
2016-10-17 15:41 ` Ruslan Bilovol
2016-10-17 15:41 ` Ruslan Bilovol
2016-10-18 6:26 ` AKASHI Takahiro
2016-10-18 6:26 ` AKASHI Takahiro
2016-11-01 12:19 ` Ruslan Bilovol
2016-11-01 12:19 ` Ruslan Bilovol
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