[PATCH] x86: nmi - nmi_watchdog boot param docs cleanup - Kernel

This is a discussion on [PATCH] x86: nmi - nmi_watchdog boot param docs cleanup - Kernel ; 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. ...

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Thread: [PATCH] x86: nmi - nmi_watchdog boot param docs cleanup

  1. [PATCH] x86: nmi - nmi_watchdog boot param docs cleanup

    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 lapoc and ioapic keywords.

    Signed-off-by: Cyrill Gorcunov
    ---

    It's a bit fun but 'panic' was placed on a second
    position which is just a plain wrong :-)

    On top of -tip dda51106620c328b50007c259b9ef8cea2b7c3d2

    Index: linux-2.6.git/Documentation/kernel-parameters.txt
    ================================================== =================
    --- linux-2.6.git.orig/Documentation/kernel-parameters.txt 2008-10-27 21:35:08.000000000 +0300
    +++ linux-2.6.git/Documentation/kernel-parameters.txt 2008-11-01 17:53:08.000000000 +0300
    @@ -1403,7 +1403,20 @@ and is between 256 and 4096 characters.
    when a NMI is triggered.
    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
    emulation library even if a 387 maths coprocessor
    Index: linux-2.6.git/Documentation/x86/x86_64/boot-options.txt
    ================================================== =================
    --- linux-2.6.git.orig/Documentation/x86/x86_64/boot-options.txt 2008-10-27 21:35:08.000000000 +0300
    +++ linux-2.6.git/Documentation/x86/x86_64/boot-options.txt 2008-11-01 17:52:22.000000000 +0300
    @@ -79,17 +79,6 @@ Timing
    Report when timer interrupts are lost because some code turned off
    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
    Don't use the HPET timer.

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  2. Re: [PATCH] x86: nmi - nmi_watchdog boot param docs cleanup


    * Cyrill Gorcunov wrote:

    > 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 lapoc and ioapic keywords.
    >
    > Signed-off-by: Cyrill Gorcunov


    applied to tip/x86/nmi-watchdog, thanks Cyrill!

    Ingo
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