arch/x86: Handle non enumerated CPU after physical hotplug

[deliverable/linux.git] / arch / x86 / kernel / smpboot.c

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 4296beb8fdd3b2d91a9644c9843d66dd2132c2ad..82b17373b66ad80e4b4d5e935b5e82d4fe3b097f 100644 (file)
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -690,7 +690,7 @@ wakeup_secondary_cpu_via_nmi(int apicid, unsigned long start_eip)
         * Give the other CPU some time to accept the IPI.
         */
        udelay(200);
-       if (APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid])) {
+       if (APIC_INTEGRATED(boot_cpu_apic_version)) {
                maxlvt = lapic_get_maxlvt();
                if (maxlvt > 3)                 /* Due to the Pentium erratum 3AP.  */
                        apic_write(APIC_ESR, 0);
@@ -717,7 +717,7 @@ wakeup_secondary_cpu_via_init(int phys_apicid, unsigned long start_eip)
        /*
         * Be paranoid about clearing APIC errors.
         */
-       if (APIC_INTEGRATED(apic_version[phys_apicid])) {
+       if (APIC_INTEGRATED(boot_cpu_apic_version)) {
                if (maxlvt > 3)         /* Due to the Pentium erratum 3AP.  */
                        apic_write(APIC_ESR, 0);
                apic_read(APIC_ESR);
@@ -756,7 +756,7 @@ wakeup_secondary_cpu_via_init(int phys_apicid, unsigned long start_eip)
         * Determine this based on the APIC version.
         * If we don't have an integrated APIC, don't send the STARTUP IPIs.
         */
-       if (APIC_INTEGRATED(apic_version[phys_apicid]))
+       if (APIC_INTEGRATED(boot_cpu_apic_version))
                num_starts = 2;
        else
                num_starts = 0;
@@ -994,7 +994,7 @@ static int do_boot_cpu(int apicid, int cpu, struct task_struct *idle)
                /*
                 * Be paranoid about clearing APIC errors.
                */
-               if (APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid])) {
+               if (APIC_INTEGRATED(boot_cpu_apic_version)) {
                        apic_write(APIC_ESR, 0);
                        apic_read(APIC_ESR);
                }
@@ -1249,7 +1249,7 @@ static int __init smp_sanity_check(unsigned max_cpus)
        /*
         * If we couldn't find a local APIC, then get out of here now!
         */
-       if (APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid]) &&
+       if (APIC_INTEGRATED(boot_cpu_apic_version) &&
            !boot_cpu_has(X86_FEATURE_APIC)) {
                if (!disable_apic) {
                        pr_err("BIOS bug, local APIC #%d not detected!...\n",
@@ -1406,9 +1406,21 @@ __init void prefill_possible_map(void)
 {
        int i, possible;
 
-       /* no processor from mptable or madt */
-       if (!num_processors)
-               num_processors = 1;
+       /* No boot processor was found in mptable or ACPI MADT */
+       if (!num_processors) {
+               int apicid = boot_cpu_physical_apicid;
+               int cpu = hard_smp_processor_id();
+
+               pr_warn("Boot CPU (id %d) not listed by BIOS\n", cpu);
+
+               /* Make sure boot cpu is enumerated */
+               if (apic->cpu_present_to_apicid(0) == BAD_APICID &&
+                   apic->apic_id_valid(apicid))
+                       generic_processor_info(apicid, boot_cpu_apic_version);
+
+               if (!num_processors)
+                       num_processors = 1;
+       }
 
        i = setup_max_cpus ?: 1;
        if (setup_possible_cpus == -1) {