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x86: nmi - nmi_watchdog boot param docs cleanup

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Impact: documentation update

1) nmi_watchdog boot parameter is common to 32/64 bit modes. So
   move it from Documentation/x86/x86_64/boot-options.txt to
   Documentation/kernel-parameters.txt and integrate with.

2) Also fix [panic] keyword placement -- it ought to be at first
   position otherwise it will not be recognized.

3) Document lapic and ioapic keywords.

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Cyrill Gorcunov 2008-11-01 18:06:51 +03:00 committed by Ingo Molnar
parent 8a1c8eb75b
commit 5b9a0e14eb
2 changed files with 14 additions and 12 deletions
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15
Documentation/kernel-parameters.txt
View file

@ -1403,7 +1403,20 @@ and is between 256 and 4096 characters. It is defined in the file
when a NMI is triggered. when a NMI is triggered.
Format: [state][,regs][,debounce][,die] Format: [state][,regs][,debounce][,die]
nmi_watchdog= [KNL,BUGS=X86-32] Debugging features for SMP kernels nmi_watchdog= [KNL,BUGS=X86-32,X86-64] Debugging features for SMP kernels
Format: [panic,][num]
Valid num: 0,1,2
0 - turn nmi_watchdog off
1 - use the IO-APIC timer for the NMI watchdog
2 - use the local APIC for the NMI watchdog using
a performance counter. Note: This will use one performance
counter and the local APIC's performance vector.
When panic is specified panic when an NMI watchdog timeout occurs.
This is useful when you use a panic=... timeout and need the box
quickly up again.
Instead of 1 and 2 it is possible to use the following
symbolic names: lapic and ioapic
Example: nmi_watchdog=2 or nmi_watchdog=panic,lapic
no387 [BUGS=X86-32] Tells the kernel to use the 387 maths no387 [BUGS=X86-32] Tells the kernel to use the 387 maths
emulation library even if a 387 maths coprocessor emulation library even if a 387 maths coprocessor

11
Documentation/x86/x86_64/boot-options.txt
View file

@ -79,17 +79,6 @@ Timing
Report when timer interrupts are lost because some code turned off Report when timer interrupts are lost because some code turned off
interrupts for too long. interrupts for too long.
nmi_watchdog=NUMBER[,panic]
NUMBER can be:
0 don't use an NMI watchdog
1 use the IO-APIC timer for the NMI watchdog
2 use the local APIC for the NMI watchdog using a performance counter. Note
This will use one performance counter and the local APIC's performance
vector.
When panic is specified panic when an NMI watchdog timeout occurs.
This is useful when you use a panic=... timeout and need the box
quickly up again.
nohpet nohpet
Don't use the HPET timer. Don't use the HPET timer.