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x86: add unknown_nmi_panic kernel parameter

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It's not possible to enable the unknown_nmi_panic sysctl option
until init is run. It's useful to be able to panic the kernel
during boot too, this adds a parameter to enable this option.

Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Simon Arlott 2008-07-19 23:32:54 +01:00 committed by Ingo Molnar
parent 5b664cb235
commit e3a61b0a8c
2 changed files with 11 additions and 0 deletions
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4
Documentation/kernel-parameters.txt
View file

@ -2158,6 +2158,10 @@ and is between 256 and 4096 characters. It is defined in the file
Note that genuine overcurrent events won't be Note that genuine overcurrent events won't be
reported either. reported either.
unknown_nmi_panic
[X86-32,X86-64]
Set unknown_nmi_panic=1 early on boot.
usbcore.autosuspend= usbcore.autosuspend=
[USB] The autosuspend time delay (in seconds) used [USB] The autosuspend time delay (in seconds) used
for newly-detected USB devices (default 2). This for newly-detected USB devices (default 2). This

7
arch/x86/kernel/nmi.c
View file

@ -448,6 +448,13 @@ nmi_watchdog_tick(struct pt_regs *regs, unsigned reason)
#ifdef CONFIG_SYSCTL #ifdef CONFIG_SYSCTL
static int __init setup_unknown_nmi_panic(char *str)
{
unknown_nmi_panic = 1;
return 1;
}
__setup("unknown_nmi_panic", setup_unknown_nmi_panic);
static int unknown_nmi_panic_callback(struct pt_regs *regs, int cpu) static int unknown_nmi_panic_callback(struct pt_regs *regs, int cpu)
{ {
unsigned char reason = get_nmi_reason(); unsigned char reason = get_nmi_reason();