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authorRobert Richter <robert.richter@amd.com>2009-07-09 15:11:45 +0200
committerRobert Richter <robert.richter@amd.com>2009-07-20 16:43:21 +0200
commit39e97f40c3a5e71de0532368deaa683e09b74ba2 (patch)
treed30e542c6aa87a68ba16bd412067682efc606758 /arch/x86/oprofile/nmi_int.c
parent52471c67ee2fa5ed6f700ef57bf27833c63b2192 (diff)
downloadlinux-2.6.38-lt-ux500-39e97f40c3a5e71de0532368deaa683e09b74ba2.tar.gz
x86/oprofile: Add function has_mux() to check multiplexing support
The check is used to prevent running multiplexing code for models not supporting multiplexing. Before, the code was running but without effect. Signed-off-by: Robert Richter <robert.richter@amd.com>
Diffstat (limited to 'arch/x86/oprofile/nmi_int.c')
-rw-r--r--arch/x86/oprofile/nmi_int.c19
1 files changed, 18 insertions, 1 deletions
diff --git a/arch/x86/oprofile/nmi_int.c b/arch/x86/oprofile/nmi_int.c
index 82ee29517f1..dca7240aeb2 100644
--- a/arch/x86/oprofile/nmi_int.c
+++ b/arch/x86/oprofile/nmi_int.c
@@ -124,6 +124,11 @@ static void nmi_stop(void)
static DEFINE_PER_CPU(int, switch_index);
+static inline int has_mux(void)
+{
+ return !!model->switch_ctrl;
+}
+
inline int op_x86_phys_to_virt(int phys)
{
return __get_cpu_var(switch_index) + phys;
@@ -132,6 +137,10 @@ inline int op_x86_phys_to_virt(int phys)
static void nmi_shutdown_mux(void)
{
int i;
+
+ if (!has_mux())
+ return;
+
for_each_possible_cpu(i) {
kfree(per_cpu(cpu_msrs, i).multiplex);
per_cpu(cpu_msrs, i).multiplex = NULL;
@@ -144,12 +153,17 @@ static int nmi_setup_mux(void)
size_t multiplex_size =
sizeof(struct op_msr) * model->num_virt_counters;
int i;
+
+ if (!has_mux())
+ return 1;
+
for_each_possible_cpu(i) {
per_cpu(cpu_msrs, i).multiplex =
kmalloc(multiplex_size, GFP_KERNEL);
if (!per_cpu(cpu_msrs, i).multiplex)
return 0;
}
+
return 1;
}
@@ -158,6 +172,9 @@ static void nmi_cpu_setup_mux(int cpu, struct op_msrs const * const msrs)
int i;
struct op_msr *multiplex = msrs->multiplex;
+ if (!has_mux())
+ return;
+
for (i = 0; i < model->num_virt_counters; ++i) {
if (counter_config[i].enabled) {
multiplex[i].saved = -(u64)counter_config[i].count;
@@ -229,7 +246,7 @@ static int nmi_multiplex_on(void)
static int nmi_switch_event(void)
{
- if (!model->switch_ctrl)
+ if (!has_mux())
return -ENOSYS; /* not implemented */
if (nmi_multiplex_on() < 0)
return -EINVAL; /* not necessary */