linux-kernel - Re: [RFC] x86: merge nmi

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Message-ID: <20080519180753.GB7773@cvg>
Date:	Mon, 19 May 2008 22:07:53 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Mikael Pettersson <mikpe@...uu.se>,
	"Maciej W. Rozycki" <macro@...ux-mips.org>,
	Tom Spink <tspink@...il.com>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jiri Slaby <jirislaby@...il.com>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [RFC] x86: merge nmi_32-64 to nmi.c

Btw, if someone is still watching this thread - I've found a bit strange
behaviour of nmi on 32bit platform. Look, we have 

	nmi_watchdog = NMI_DEFAULT

by default which is the alias to NMI_DISABLED. Then lets assume that
user put some option on command line, say for example he passes something
like that

	nmi_watchdog=2

which set it to

	nmi_watchdog = NMI_LOCAL_APIC

with only that option passed we have sysfs entry created
but I can't figure out why in proc_nmi_enabled() we have this
code

	if (nmi_watchdog == NMI_DEFAULT) {
		if (lapic_watchdog_ok())
			nmi_watchdog = NMI_LOCAL_APIC;
		else
			nmi_watchdog = NMI_IO_APIC;
	}

it seems it just _dont need_ at and could be safetly removed.
Did I miss something?

		- Cyrill -
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