[Xen-changelog] Fix 'nosmp' and ensure that CPU#0 is reported properly

[Xen patchbot -unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID 305649f5ad568e9fbb51aa69659a724a6dde75f3
# Parent  3492adc0ad60ae3d7bf46dc1da62ed60d7b68ee1
Fix 'nosmp' and ensure that CPU#0 is reported properly
by /proc/cpuinfo. Also fix the sibling and core maps.
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>

diff -r 3492adc0ad60 -r 305649f5ad56 
linux-2.6-xen-sparse/arch/xen/kernel/smpboot.c
--- a/linux-2.6-xen-sparse/arch/xen/kernel/smpboot.c    Tue Nov  1 15:44:25 2005
+++ b/linux-2.6-xen-sparse/arch/xen/kernel/smpboot.c    Tue Nov  1 16:49:19 2005
@@ -191,10 +191,17 @@
        int cpu, rc;
        struct task_struct *idle;
 
-       if (max_cpus == 0)
-               return;
-
-       xen_smp_intr_init(0);
+       cpu_data[0] = boot_cpu_data;
+
+       cpu_2_logical_apicid[0] = 0;
+       x86_cpu_to_apicid[0] = 0;
+
+       current_thread_info()->cpu = 0;
+       cpu_sibling_map[0] = cpumask_of_cpu(0);
+       cpu_core_map[0]    = cpumask_of_cpu(0);
+
+       if (max_cpus != 0)
+               xen_smp_intr_init(0);
 
        for (cpu = 1; cpu < max_cpus; cpu++) {
                rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, cpu, NULL);
@@ -236,9 +243,9 @@
        }
 
        /* Currently, Xen gives no dynamic NUMA/HT info. */
-       for (cpu = 0; cpu < NR_CPUS; cpu++) {
-               cpus_clear(cpu_sibling_map[cpu]);
-               cpus_clear(cpu_core_map[cpu]);
+       for (cpu = 1; cpu < NR_CPUS; cpu++) {
+               cpu_sibling_map[cpu] = cpumask_of_cpu(cpu);
+               cpu_core_map[cpu]    = cpumask_of_cpu(cpu);
        }
 
 #ifdef CONFIG_X86_IO_APIC
@@ -256,17 +263,6 @@
        cpu_possible_map = cpumask_of_cpu(0);
        cpu_present_map  = cpumask_of_cpu(0);
        cpu_online_map   = cpumask_of_cpu(0);
-
-       cpu_data[0] = boot_cpu_data;
-       cpu_2_logical_apicid[0] = 0;
-       x86_cpu_to_apicid[0] = 0;
-
-       current_thread_info()->cpu = 0;
-       cpus_clear(cpu_sibling_map[0]);
-       cpu_set(0, cpu_sibling_map[0]);
-
-       cpus_clear(cpu_core_map[0]);
-       cpu_set(0, cpu_core_map[0]);
 }
 
 static void vcpu_hotplug(unsigned int cpu)

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