aboutsummaryrefslogtreecommitdiff
path: root/arch/x86/oprofile/nmi_int.c
diff options
context:
space:
mode:
authorRobert Richter <robert.richter@amd.com>2010-02-25 19:16:46 +0100
committerRobert Richter <robert.richter@amd.com>2010-02-26 15:19:03 +0100
commit68dc819ce829f7e7977a56524e710473bdb55115 (patch)
tree639908a6534dc9ee4780d62ad9f5f28d52e58b7d /arch/x86/oprofile/nmi_int.c
parent8588d1067147e14d1dd521fbadd1d2564f8cc794 (diff)
downloadlinux-2.6.38-lt-ux500-68dc819ce829f7e7977a56524e710473bdb55115.tar.gz
oprofile/x86: fix perfctr nmi reservation for mulitplexing
Multiple virtual counters share one physical counter. The reservation of virtual counters fails due to duplicate allocation of the same counter. The counters are already reserved. Thus, virtual counter reservation may removed at all. This also makes the code easier. Cc: stable@kernel.org 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.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/arch/x86/oprofile/nmi_int.c b/arch/x86/oprofile/nmi_int.c
index 3347f696edc..7170d1e2989 100644
--- a/arch/x86/oprofile/nmi_int.c
+++ b/arch/x86/oprofile/nmi_int.c
@@ -179,7 +179,6 @@ static void nmi_cpu_setup_mux(int cpu, struct op_msrs const * const msrs)
if (counter_config[i].enabled) {
multiplex[i].saved = -(u64)counter_config[i].count;
} else {
- multiplex[i].addr = 0;
multiplex[i].saved = 0;
}
}
@@ -189,25 +188,27 @@ static void nmi_cpu_setup_mux(int cpu, struct op_msrs const * const msrs)
static void nmi_cpu_save_mpx_registers(struct op_msrs *msrs)
{
+ struct op_msr *counters = msrs->counters;
struct op_msr *multiplex = msrs->multiplex;
int i;
for (i = 0; i < model->num_counters; ++i) {
int virt = op_x86_phys_to_virt(i);
- if (multiplex[virt].addr)
- rdmsrl(multiplex[virt].addr, multiplex[virt].saved);
+ if (counters[i].addr)
+ rdmsrl(counters[i].addr, multiplex[virt].saved);
}
}
static void nmi_cpu_restore_mpx_registers(struct op_msrs *msrs)
{
+ struct op_msr *counters = msrs->counters;
struct op_msr *multiplex = msrs->multiplex;
int i;
for (i = 0; i < model->num_counters; ++i) {
int virt = op_x86_phys_to_virt(i);
- if (multiplex[virt].addr)
- wrmsrl(multiplex[virt].addr, multiplex[virt].saved);
+ if (counters[i].addr)
+ wrmsrl(counters[i].addr, multiplex[virt].saved);
}
}