[patch 15/20] x86, ds: use single debug store cpu configuration

[markus . t . metzger]

Use a single configuration for all cpus.


Reported-by: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Markus Metzger <markus.t.metzger@xxxxxxxxx>
---
 arch/x86/kernel/ds.c |    7 	5 +	2 -	0 !
 1 file changed, 5 insertions(+), 2 deletions(-)

Index: b/arch/x86/kernel/ds.c
===================================================================
--- 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_configurati
 
 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) {

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