85 lines
2.5 KiB
Diff
85 lines
2.5 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Jeremy Rocher <jeremy.rocher@intel.com>
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Date: Wed, 20 Jul 2016 10:00:44 +0200
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Subject: [PATCH] reboot: add reboot_panic parameter
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This "reboot_panic" kernel cmdline parameter allow to change the
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reboot mode in case of panic only. It use the same format as the
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"reboot" parameter. Example, for cf9 warm reset in case of panic: reboot_panic=p,w
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Signed-off-by: Jeremy Rocher <jeremy.rocher@intel.com>
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Signed-off-by: Tian, Baofeng
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---
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.../admin-guide/kernel-parameters.txt | 3 ++
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kernel/reboot.c | 29 ++++++++++++++++++-
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2 files changed, 31 insertions(+), 1 deletion(-)
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diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
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index fcc756a8c19a..6f8f8994ecdc 100644
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--- a/Documentation/admin-guide/kernel-parameters.txt
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+++ b/Documentation/admin-guide/kernel-parameters.txt
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@@ -4030,6 +4030,9 @@
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reboot_cpu is s[mp]#### with #### being the processor
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to be used for rebooting.
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+ reboot_panic= [KNL]
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+ Same as reboot parameter above but only in case of panic.
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+
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relax_domain_level=
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[KNL, SMP] Set scheduler's default relax_domain_level.
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See Documentation/cgroup-v1/cpusets.txt.
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diff --git a/kernel/reboot.c b/kernel/reboot.c
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index 45bea54f9aee..7f30e8bc8d3b 100644
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--- a/kernel/reboot.c
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+++ b/kernel/reboot.c
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@@ -43,6 +43,7 @@ int reboot_default = 1;
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int reboot_cpu;
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enum reboot_type reboot_type = BOOT_ACPI;
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int reboot_force;
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+char *reboot_panic_param;
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/*
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* If set, this is used for preparing the system to power off.
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@@ -515,7 +516,7 @@ void orderly_reboot(void)
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}
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EXPORT_SYMBOL_GPL(orderly_reboot);
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-static int __init reboot_setup(char *str)
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+static int reboot_setup(char *str)
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{
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for (;;) {
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/*
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@@ -582,3 +583,29 @@ static int __init reboot_setup(char *str)
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return 1;
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}
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__setup("reboot=", reboot_setup);
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+
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+static int reboot_panic_notifier_call(struct notifier_block *notifier,
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+ unsigned long what, void *data)
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+{
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+ if (!reboot_panic_param)
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+ return NOTIFY_DONE;
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+
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+ reboot_setup(reboot_panic_param);
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+ pr_info("panic mode set: %s\n", reboot_panic_param);
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+
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+ return NOTIFY_DONE;
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+}
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+
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+static struct notifier_block reboot_panic_notifier = {
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+ .notifier_call = reboot_panic_notifier_call,
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+};
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+
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+static int __init reboot_panic_setup(char *str)
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+{
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+ reboot_panic_param = str;
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+ atomic_notifier_chain_register(&panic_notifier_list,
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+ &reboot_panic_notifier);
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+
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+ return 1;
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+}
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+__setup("reboot_panic=", reboot_panic_setup);
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--
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https://clearlinux.org
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