From a5f5e43e2b1377392f9afe93aca29b9abf1d6a44 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Mon, 5 Mar 2007 00:30:45 -0800 Subject: [PATCH] [PATCH] fix "NMI appears to be stuck" Testing NMI watchdog ... CPU#0: NMI appears to be stuck (54->54)! CPU#1: NMI appears to be stuck (0->0)! Keep the PIT/HPET alive when nmi_watchdog = 1 is given on the command line. Signed-off-by: Thomas Gleixner Cc: Ingo Molnar Cc: Andi Kleen Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/i386/kernel/apic.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/arch/i386/kernel/apic.c b/arch/i386/kernel/apic.c index 7a2c9cbdb51..2383bcf18c5 100644 --- a/arch/i386/kernel/apic.c +++ b/arch/i386/kernel/apic.c @@ -493,8 +493,15 @@ void __init setup_boot_APIC_clock(void) /* No broadcast on UP ! */ if (num_possible_cpus() == 1) return; - } else - lapic_clockevent.features &= ~CLOCK_EVT_FEAT_DUMMY; + } else { + /* + * If nmi_watchdog is set to IO_APIC, we need the + * PIT/HPET going. Otherwise register lapic as a dummy + * device. + */ + if (nmi_watchdog != NMI_IO_APIC) + lapic_clockevent.features &= ~CLOCK_EVT_FEAT_DUMMY; + } /* Setup the lapic or request the broadcast */ setup_APIC_timer(); -- 2.20.1