> Crap, you're right, either notify_cpu_starting() is done too early or
> smp_store_cpu_info() is done too late.
>
> Since smp_store_cpu_info() relies on the result of calibrate_delay() we
> can't easily change that order, but since there really isn't any other
> CPU_STARTING user in tree (I appear to have created the first?!) we can
> easily move that notifier thing later.
>
> (What's up with that IRQ-enable over calibrate_delay(), can't we simply
> enable the NMI watchdog later?)
>
> So I guess something like the below should work:
The patch does work for me. I made two small modifications by
adding amd_has_nb() such that the correct checking is for on amd_nb.
Signed-off-by: Stephane Eranian <eran...@google.com>
diff --git a/arch/x86/kernel/cpu/perf_event_amd.c
b/arch/x86/kernel/cpu/perf_event_amd.c
index a61e54b..6204739 100644
--- a/arch/x86/kernel/cpu/perf_event_amd.c
+++ b/arch/x86/kernel/cpu/perf_event_amd.c
@@ -137,6 +137,13 @@ static inline int amd_is_nb_event(struct hw_perf_event
*hwc)
return (hwc->config & 0xe0) == 0xe0;
}
+static inline int amd_has_nb(struct cpu_hw_events *cpuc)
+{
+ struct amd_nb *nb = cpuc->amd_nb;
+
+ return nb && nb->nb_id != -1;
+}
+
static void amd_put_event_constraints(struct cpu_hw_events *cpuc,
struct perf_event *event)
{
@@ -147,7 +154,7 @@ static void amd_put_event_constraints(struct cpu_hw_events
*cpuc,
/*
* only care about NB events
*/
- if (!(nb && amd_is_nb_event(hwc)))
+ if (!(amd_has_nb(cpuc) && amd_is_nb_event(hwc)))
return;
/*
@@ -214,7 +221,7 @@ amd_get_event_constraints(struct cpu_hw_events *cpuc,
struct perf_event *event)
/*
* if not NB event or no NB, then no constraints
*/
- if (!(nb && amd_is_nb_event(hwc)))
+ if (!(amd_has_nb(cpuc) && amd_is_nb_event(hwc)))
return &unconstrained;
/*
------------------------------------------------------------------------------
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