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| author | Suresh Siddha | 2011-12-22 02:45:19 +0100 |
|---|---|---|
| committer | H. Peter Anvin | 2011-12-23 20:01:49 +0100 |
| commit | c284b42abadbb22083bfde24d308899c08d44ffa (patch) | |
| tree | fb6890a1b3c5a4f72f52122ae652cad438fb20d2 /arch/x86/kernel/smpboot.c | |
| parent | x86, x2apic: Allow "nox2apic" to disable x2apic mode setup by BIOS (diff) | |
| download | kernel-qcow2-linux-c284b42abadbb22083bfde24d308899c08d44ffa.tar.gz kernel-qcow2-linux-c284b42abadbb22083bfde24d308899c08d44ffa.tar.xz kernel-qcow2-linux-c284b42abadbb22083bfde24d308899c08d44ffa.zip | |
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>
Diffstat (limited to 'arch/x86/kernel/smpboot.c')
| -rw-r--r-- | arch/x86/kernel/smpboot.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index 9f548cb4a958..e38e21754eea 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -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; } |