From: james.morse@arm.com (James Morse) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v26 6/7] arm64: kdump: update a kernel doc Date: Fri, 16 Sep 2016 17:08:28 +0100 [thread overview] Message-ID: <57DC18FC.9000807@arm.com> (raw) In-Reply-To: <20160907042908.6232-7-takahiro.akashi@linaro.org> 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'. Can we change the recomendation to "1 nosmp reset_devices"? Thanks, James
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From: James Morse <james.morse@arm.com> To: 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: Fri, 16 Sep 2016 17:08:28 +0100 [thread overview] Message-ID: <57DC18FC.9000807@arm.com> (raw) In-Reply-To: <20160907042908.6232-7-takahiro.akashi@linaro.org> 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'. Can we change the recomendation to "1 nosmp reset_devices"? Thanks, James _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec
next prev parent reply other threads:[~2016-09-16 16:08 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 [this message] 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 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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