[RFC -tip] x86: nmi - add sensible names to nmi_watchdog boot param

[Cyrill Gorcunov <gorcunov@gmail.com>]

Add sensible names as "lapic" and "ioapic" to
nmi_watchdog boot parameter. Sometimes it is not
that easy to recall what exactly nmi_watchdog=1
does mean so we allow the using of symbolic names here.

Old numeric values remain valid.

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
---

 arch/x86/kernel/nmi.c |   15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

Index: linux-2.6.git/arch/x86/kernel/nmi.c
===================================================================
--- linux-2.6.git.orig/arch/x86/kernel/nmi.c	2008-10-27 21:35:21.000000000 +0300
+++ linux-2.6.git/arch/x86/kernel/nmi.c	2008-10-30 19:01:52.000000000 +0300
@@ -208,12 +208,17 @@ static int __init setup_nmi_watchdog(cha
 		++str;
 	}
 
-	get_option(&str, &nmi);
-
-	if (nmi >= NMI_INVALID)
-		return 0;
+	if (!strncmp(str, "lapic", 5))
+		nmi_watchdog = NMI_LOCAL_APIC;
+	else if (!strncmp(str, "ioapic", 6))
+		nmi_watchdog = NMI_IO_APIC;
+	else {
+		get_option(&str, &nmi);
+		if (nmi >= NMI_INVALID)
+			return 0;
+		nmi_watchdog = nmi;
+	}
 
-	nmi_watchdog = nmi;
 	return 1;
 }
 __setup("nmi_watchdog=", setup_nmi_watchdog);