x86, ds: use single debug store cpu configuration

Use a single configuration for all cpus.

Reported-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
Cc: roland@redhat.com
Cc: eranian@googlemail.com
Cc: oleg@redhat.com
Cc: juan.villacis@intel.com
Cc: ak@linux.jf.intel.com
LKML-Reference: <20090403144602.191165000@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/ds.c b/arch/x86/kernel/ds.c
index 71cab3b62dce1598ad660e64e938af270f9c7382..443f415441daefe4a807afba68450ad922c91fbc 100644 (file)
--- a/arch/x86/kernel/ds.c
+++ b/arch/x86/kernel/ds.c
@@ -47,9 +47,8 @@ struct ds_configuration {
        /* Control bit-masks indexed by enum ds_feature: */
        unsigned long           ctl[dsf_ctl_max];
 };
-static DEFINE_PER_CPU(struct ds_configuration, ds_cfg_array);
+static struct ds_configuration ds_cfg __read_mostly;
 
-#define ds_cfg per_cpu(ds_cfg_array, smp_processor_id())
 
 /* Maximal size of a DS configuration: */
 #define MAX_SIZEOF_DS          (12 * 8)
@@ -1268,6 +1267,10 @@ ds_configure(const struct ds_configuration *cfg,
 
 void __cpuinit ds_init_intel(struct cpuinfo_x86 *c)
 {
+       /* Only configure the first cpu. Others are identical. */
+       if (ds_cfg.name)
+               return;
+
        switch (c->x86) {
        case 0x6:
                switch (c->x86_model) {