[PATCH v26 6/7] arm64: kdump: update a kernel doc
From: james.morse@arm.com (James Morse)
Date: 2016-09-16 16:08:28
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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.
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diff --git a/Documentation/kdump/kdump.txt b/Documentation/kdump/kdump.txt
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@@ -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.
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@@ -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