[tip:tracing/core] x86, ds: use single debug store cpu configuration

[tip-bot for Markus Metzger]

Commit-ID:  ee811517a5604aa63fae803b7c044712699e1303
Gitweb:     http://git.kernel.org/tip/ee811517a5604aa63fae803b7c044712699e1303
Author:     Markus Metzger <markus.t.metzger@xxxxxxxxx>
AuthorDate: Fri, 3 Apr 2009 16:43:47 +0200
Committer:  Ingo Molnar <mingo@xxxxxxx>
CommitDate: Tue, 7 Apr 2009 13:36:29 +0200

x86, ds: use single debug store cpu configuration

Use a single configuration for all cpus.

Reported-by: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Markus Metzger <markus.t.metzger@xxxxxxxxx>
Cc: roland@xxxxxxxxxx
Cc: eranian@xxxxxxxxxxxxxx
Cc: oleg@xxxxxxxxxx
Cc: juan.villacis@xxxxxxxxx
Cc: ak@xxxxxxxxxxxxxxxxxx
LKML-Reference: <20090403144602.191165000@xxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>


---
 arch/x86/kernel/ds.c |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/ds.c b/arch/x86/kernel/ds.c
index 71cab3b..443f415 100644
--- 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) {
--
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