[Xen-changelog] Fix blkif and netif backend teardown -- do not remove devices from

[Xen patchbot-3.0-testing <patchbot-3.0-testing@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID 651267a6933e08c726857db742aa0c4a4638bd1a
# Parent  83127ceb792f06a5b30547f342ff57a500d89c47
Set up and tear down phys_proc_id, cpu_core_id, cpu_sibling_map
and cpu_core_map when CPUs come online and go offline.

Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
xen-unstable changeset:   9962:d8954fc3b76b6bdbe0cd301924b51dffa43409d1
xen-unstable date:        Wed May 10 15:44:56 2006 +0100
---
 linux-2.6-xen-sparse/drivers/xen/core/smpboot.c |   42 ++++++++++++++++++++++--
 1 files changed, 40 insertions(+), 2 deletions(-)

diff -r 83127ceb792f -r 651267a6933e 
linux-2.6-xen-sparse/drivers/xen/core/smpboot.c
--- a/linux-2.6-xen-sparse/drivers/xen/core/smpboot.c   Wed May 10 13:42:10 
2006 +0100
+++ b/linux-2.6-xen-sparse/drivers/xen/core/smpboot.c   Wed May 10 15:46:08 
2006 +0100
@@ -107,6 +107,18 @@ void __init smp_alloc_memory(void)
 {
 }
 
+static inline void
+set_cpu_sibling_map(int cpu)
+{
+       phys_proc_id[cpu] = cpu;
+       cpu_core_id[cpu]  = 0;
+
+       cpu_sibling_map[cpu] = cpumask_of_cpu(cpu);
+       cpu_core_map[cpu]    = cpumask_of_cpu(cpu);
+
+       cpu_data[cpu].booted_cores = 1;
+}
+
 static void xen_smp_intr_init(unsigned int cpu)
 {
        sprintf(resched_name[cpu], "resched%d", cpu);
@@ -230,14 +242,20 @@ void __init smp_prepare_cpus(unsigned in
        struct Xgt_desc_struct *gdt_descr;
 #endif
 
+       boot_cpu_data.apicid = 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);
+
+       for (cpu = 0; cpu < NR_CPUS; cpu++) {
+               cpus_clear(cpu_sibling_map[cpu]);
+               cpus_clear(cpu_core_map[cpu]);
+       }
+
+       set_cpu_sibling_map(0);
 
        xen_smp_intr_init(0);
 
@@ -262,6 +280,8 @@ void __init smp_prepare_cpus(unsigned in
                        XENFEAT_writable_descriptor_tables);
 
                cpu_data[cpu] = boot_cpu_data;
+               cpu_data[cpu].apicid = cpu;
+
                cpu_2_logical_apicid[cpu] = cpu;
                x86_cpu_to_apicid[cpu] = cpu;
 
@@ -470,6 +490,18 @@ void smp_resume(void)
                vcpu_hotplug(i);
 }
 
+static void
+remove_siblinginfo(int cpu)
+{
+       phys_proc_id[cpu] = BAD_APICID;
+       cpu_core_id[cpu]  = BAD_APICID;
+
+       cpus_clear(cpu_sibling_map[cpu]);
+       cpus_clear(cpu_core_map[cpu]);
+
+       cpu_data[cpu].booted_cores = 0;
+}
+
 int __cpu_disable(void)
 {
        cpumask_t map = cpu_online_map;
@@ -477,6 +509,8 @@ int __cpu_disable(void)
 
        if (cpu == 0)
                return -EBUSY;
+
+       remove_siblinginfo(cpu);
 
        cpu_clear(cpu, map);
        fixup_irqs(map);
@@ -549,6 +583,10 @@ int __devinit __cpu_up(unsigned int cpu)
                prepare_for_smp();
 #endif
 
+       /* This must be done before setting cpu_online_map */
+       set_cpu_sibling_map(cpu);
+       wmb();
+
        xen_smp_intr_init(cpu);
        cpu_set(cpu, cpu_online_map);
 

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