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x86: Skip cpus with apic-ids >= 255 in !x2apic_mode 

If the x2apic mode is disabled for reasons like interrupt-remapping
not available etc, then we need to skip the logical cpu bringup of
apic-id's >= 255. Otherwise as the platform is in xapic mode, init/startup
IPI's will consider only the low 8-bits and there is a possibility of
re-sending init/startup IPI's to the logical cpu that is already online.

This will avoid potential reboots/unpredictable behavior etc.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Link: http://lkml.kernel.org/r/20111222014632.702932458@sbsiddha-desk.sc.intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Suresh Siddha 2011-12-21 17:45:19 -08:00 committed by H. Peter Anvin
parent a31bc32760
commit c284b42aba
1 changed files with 2 additions and 1 deletions
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3
arch/x86/kernel/smpboot.c
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@ -840,7 +840,8 @@ int __cpuinit native_cpu_up(unsigned int cpu)
pr_debug("++++++++++++++++++++=_---CPU UP %u\n", cpu);
if (apicid == BAD_APICID || apicid == boot_cpu_physical_apicid ||
!physid_isset(apicid, phys_cpu_present_map)) {
!physid_isset(apicid, phys_cpu_present_map) ||
(!x2apic_mode && apicid >= 255)) {
printk(KERN_ERR "%s: bad cpu %d\n", __func__, cpu);
return -EINVAL;
}