x86, io-apic: fix nmi_watchdog=1 bootup hang
nmi_watchdog=1 hangs on 64-bit: [ 0.250000] Detected 12.564 MHz APIC timer. [ 0.254178] APIC timer registered as dummy, due to nmi_watchdog=1! [ 0.260366] Testing NMI watchdog ... <4>WARNING: CPU#0: NMI appears to be stuck (0->0)! [ ... ] [ 0.470003] calling genl_init+0x0/0xd0 [ hard hang ] bisected it down to: git-bisect start git-bisect good1beee8dc8c
git-bisect bad 11582ece0aaa2d0f94f345c08a4ab9997078a083 git-bisect bad 5479c623bb44089844022c03d4c0eb16d5b7a15f git-bisect bad cfb4c7fabeb499e1c29f9d1878968e37a938e28a git-bisect good246dd412d3
git-bisect bad 3f8237eaff7dc1e35fa791dae095574fd974e671 git-bisect good 90e23b13ab849e2a11f00c655eb3a2011b4623be git-bisect bad 833526a34eeefc117df3191a594c3c3a4f15a9ac git-bisect good 791b93d3dfaf16c23e978bec0cc0a3dd9d855d63 git-bisect bad 65767c64068f2c93e56a1accfed5c78230ac12d7 git-bisect bad 2abc5c05dd82c188e3bdf6641a274f013348d14b git-bisect bad 317e1f2597ffb4d4db940577bbe56dc6e881ef07 | 317e1f2597ffb4d4db940577bbe56dc6e881ef07 is first bad commit | commit 317e1f2597ffb4d4db940577bbe56dc6e881ef07 | Author: Maciej W. Rozycki <macro@linux-mips.org> | Date: Wed May 21 22:10:22 2008 +0100 | x86: I/O APIC: clean up the 8259A on a NMI watchdog failure the problem is that in the dummy-lapic branch we rely on the i8259A but if the NMI watchdog fails we turn off IRQ 0 - which doesnt work too well ;-) Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -541,11 +541,13 @@ void __init setup_boot_APIC_clock(void)
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* PIT/HPET going. Otherwise register lapic as a dummy
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* PIT/HPET going. Otherwise register lapic as a dummy
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* device.
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* device.
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*/
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*/
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if (nmi_watchdog != NMI_IO_APIC)
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if (nmi_watchdog != NMI_IO_APIC) {
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lapic_clockevent.features &= ~CLOCK_EVT_FEAT_DUMMY;
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lapic_clockevent.features &= ~CLOCK_EVT_FEAT_DUMMY;
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else
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} else {
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printk(KERN_WARNING "APIC timer registered as dummy,"
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printk(KERN_WARNING "APIC timer registered as dummy,"
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" due to nmi_watchdog=1!\n");
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" due to nmi_watchdog=1!\n");
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timer_through_8259 = 1;
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}
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}
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}
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/* Setup the lapic or request the broadcast */
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/* Setup the lapic or request the broadcast */
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@ -413,11 +413,13 @@ void __init setup_boot_APIC_clock(void)
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* PIT/HPET going. Otherwise register lapic as a dummy
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* PIT/HPET going. Otherwise register lapic as a dummy
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* device.
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* device.
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*/
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*/
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if (nmi_watchdog != NMI_IO_APIC)
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if (nmi_watchdog != NMI_IO_APIC) {
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lapic_clockevent.features &= ~CLOCK_EVT_FEAT_DUMMY;
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lapic_clockevent.features &= ~CLOCK_EVT_FEAT_DUMMY;
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else
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} else {
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printk(KERN_WARNING "APIC timer registered as dummy,"
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printk(KERN_WARNING "APIC timer registered as dummy,"
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" due to nmi_watchdog=1!\n");
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" due to nmi_watchdog=1!\n");
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timer_through_8259 = 1;
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}
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setup_APIC_timer();
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setup_APIC_timer();
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}
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}
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