x86, AMD: Fix stale cpuid4_info shared_map data in shared_cpu_map cpumasks

The per_cpu cpuid4_info shared_map can contain stale data when CPUs are added
and removed.

The stale data can lead to a NULL pointer derefernce panic on a remove of a
CPU that has had siblings previously removed.

This patch resolves the panic by verifying a cpu is actually online before
adding it to the shared_cpu_map, only examining cpus that are part of
the same lower level cache, and by updating other siblings lowest level cache
maps when a cpu is added.

Signed-off-by: Prarit Bhargava <prarit@redhat.com>
LKML-Reference: <20091209183336.17855.98708.sendpatchset@prarit.bos.redhat.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

diff --git a/arch/x86/kernel/cpu/intel_cacheinfo.c b/arch/x86/kernel/cpu/intel_cacheinfo.c
index 6c40f6b5b340b031192232bdc946d62c7076d0cc..63ada177b40c459376749315c3e28419d8c2df5a 100644 (file)
--- a/arch/x86/kernel/cpu/intel_cacheinfo.c
+++ b/arch/x86/kernel/cpu/intel_cacheinfo.c
@@ -507,18 +507,19 @@ static void __cpuinit cache_shared_cpu_map_setup(unsigned int cpu, int index)
 {
        struct _cpuid4_info     *this_leaf, *sibling_leaf;
        unsigned long num_threads_sharing;
-       int index_msb, i;
+       int index_msb, i, sibling;
        struct cpuinfo_x86 *c = &cpu_data(cpu);
 
        if ((index == 3) && (c->x86_vendor == X86_VENDOR_AMD)) {
-               struct cpuinfo_x86 *d;
-               for_each_online_cpu(i) {
+               for_each_cpu(i, c->llc_shared_map) {
                        if (!per_cpu(cpuid4_info, i))
                                continue;
-                       d = &cpu_data(i);
                        this_leaf = CPUID4_INFO_IDX(i, index);
-                       cpumask_copy(to_cpumask(this_leaf->shared_cpu_map),
-                                    d->llc_shared_map);
+                       for_each_cpu(sibling, c->llc_shared_map) {
+                               if (!cpu_online(sibling))
+                                       continue;
+                               set_bit(sibling, this_leaf->shared_cpu_map);
+                       }
                }
                return;
        }