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Date: Sat, 1 Nov 2008 18:06:51 +0300 From: Cyrill Gorcunov <gorcunov@...il.com> To: Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org> Cc: "H. Peter Anvin" <hpa@...or.com>, "Maciej W. Rozycki" <macro@...ux-mips.org>, Thomas Gleixner <tglx@...utronix.de>, Yinghai Lu <yhlu.kernel@...il.com>, Aristeu Rozanski <aris@...hat.com> Subject: [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 <gorcunov@...il.com> --- 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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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