perf/x86: Simplify x86_pmu.get_constraints() interface

There is a special case for validate_events() where we'll call
x86_pmu.get_constraints(.idx=-1). It's purpose, up until recent, seems
to be to avoid taking a previous constraint from
cpuc->event_constraint[] in intel_get_event_constraints().

(I could not find any other get_event_constraints() implementation
using @idx)

However, since that cpuc is freshly allocated, that array will in fact
be initialized with NULL pointers, achieving the very same effect.

Therefore remove this exception.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Stephane Eranian <eranian@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index e2b1447..508bf53 100644 (file)
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -2031,7 +2031,7 @@ static int validate_event(struct perf_event *event)
        if (IS_ERR(fake_cpuc))
                return PTR_ERR(fake_cpuc);
 
-       c = x86_pmu.get_event_constraints(fake_cpuc, -1, event);
+       c = x86_pmu.get_event_constraints(fake_cpuc, 0, event);
 
        if (!c || !c->weight)
                ret = -EINVAL;

diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index dee281d..879ab54 100644 (file)
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -2931,11 +2931,9 @@ static struct event_constraint *
 intel_get_event_constraints(struct cpu_hw_events *cpuc, int idx,
                            struct perf_event *event)
 {
-       struct event_constraint *c1 = NULL;
-       struct event_constraint *c2;
+       struct event_constraint *c1, *c2;
 
-       if (idx >= 0) /* fake does < 0 */
-               c1 = cpuc->event_constraint[idx];
+       c1 = cpuc->event_constraint[idx];
 
        /*
         * first time only
@@ -3410,7 +3408,7 @@ tfa_get_event_constraints(struct cpu_hw_events *cpuc, int idx,
        /*
         * Without TFA we must not use PMC3.
         */
-       if (!allow_tsx_force_abort && test_bit(3, c->idxmsk) && idx >= 0) {
+       if (!allow_tsx_force_abort && test_bit(3, c->idxmsk)) {
                c = dyn_constraint(cpuc, c, idx);
                c->idxmsk64 &= ~(1ULL << 3);
                c->weight--;