x86: nmi - add sensible names to nmi_watchdog boot param

Impact: introduce nmi_watchdog=lapic and nmi_watchdog=ioapic aliases

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>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/nmi.c b/arch/x86/kernel/nmi.c
index 2c97f07..c4869e4 100644 (file)
--- a/arch/x86/kernel/nmi.c
+++ b/arch/x86/kernel/nmi.c
@@ -199,12 +199,17 @@ static int __init setup_nmi_watchdog(char *str)
                ++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);