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oprofile/x86: fix msr access to reserved counters 

During switching virtual counters there is access to perfctr msrs. If
the counter is not available this fails due to an invalid
address. This patch fixes this.

Cc: stable@kernel.org
Signed-off-by: Robert Richter <robert.richter@amd.com>
This commit is contained in:
Robert Richter 2010-02-26 13:45:24 +01:00
parent c17c8fbf34
commit cfc9c0b450
1 changed files with 4 additions and 5 deletions
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9
arch/x86/oprofile/op_model_amd.c
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@ -127,7 +127,7 @@ static void op_mux_switch_ctrl(struct op_x86_model_spec const *model,
/* enable active counters */
for (i = 0; i < NUM_COUNTERS; ++i) {
int virt = op_x86_phys_to_virt(i);
if (!counter_config[virt].enabled)
if (!reset_value[virt])
continue;
rdmsrl(msrs->controls[i].addr, val);
val &= model->reserved;
@ -163,7 +163,8 @@ static void op_amd_setup_ctrs(struct op_x86_model_spec const *model,
/* setup reset_value */
for (i = 0; i < NUM_VIRT_COUNTERS; ++i) {
if (counter_config[i].enabled)
if (counter_config[i].enabled
&& msrs->counters[op_x86_virt_to_phys(i)].addr)
reset_value[i] = counter_config[i].count;
else
reset_value[i] = 0;
@ -197,9 +198,7 @@ static void op_amd_setup_ctrs(struct op_x86_model_spec const *model,
/* enable active counters */
for (i = 0; i < NUM_COUNTERS; ++i) {
int virt = op_x86_phys_to_virt(i);
if (!counter_config[virt].enabled)
continue;
if (!msrs->counters[i].addr)
if (!reset_value[virt])
continue;
/* setup counter registers */