diff options
| author | Ingo Molnar <mingo@elte.hu> | 2007-10-17 18:04:34 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@inhelltoy.tec.linutronix.de> | 2007-10-17 20:15:35 +0200 |
| commit | 3fb450a327fc098efe6c9f000d470abac354cfcc (patch) | |
| tree | 5e8edbbc4b743a797253340bd96000049dbd12ff /arch/x86/kernel/smpboot_32.c | |
| parent | 2f62c94176af875f22ecd01887a550d5d48092fc (diff) | |
x86: enable NMI watchdog on nosmp
if nosmp has been passed as a boot option, but nmi_watchdog=2 has also
been enabled then keep minimal local APIC functionality around to make
the watchdog work.
this allowed me to debug a hard hang that would only occur with a nosmp
bootup.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/kernel/smpboot_32.c')
| -rw-r--r-- | arch/x86/kernel/smpboot_32.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/kernel/smpboot_32.c b/arch/x86/kernel/smpboot_32.c index edc9db69a11..83e4f40f8dc 100644 --- a/arch/x86/kernel/smpboot_32.c +++ b/arch/x86/kernel/smpboot_32.c @@ -1021,6 +1021,12 @@ static void __init smp_boot_cpus(unsigned int max_cpus) if (!max_cpus) { smp_found_config = 0; printk(KERN_INFO "SMP mode deactivated, forcing use of dummy APIC emulation.\n"); + + if (nmi_watchdog == NMI_LOCAL_APIC) { + printk(KERN_INFO "activating minimal APIC for NMI watchdog use.\n"); + connect_bsp_APIC(); + setup_local_APIC(); + } smpboot_clear_io_apic_irqs(); phys_cpu_present_map = physid_mask_of_physid(0); cpu_set(0, per_cpu(cpu_sibling_map, 0)); |