[PATCH V3 3/4] arm64/perf: Assert all platform event flags are within PERF_EVENT_FLAG_ARCH

From: Anshuman Khandual
Date: Wed Sep 07 2022 - 05:20:17 EST


Ensure all platform specific event flags are within PERF_EVENT_FLAG_ARCH.

Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: linux-perf-users@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Reviewed-by: James Clark <james.clark@xxxxxxx>
Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
---
drivers/perf/arm_spe_pmu.c | 4 +++-
include/linux/perf/arm_pmu.h | 9 +++++----
2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/perf/arm_spe_pmu.c b/drivers/perf/arm_spe_pmu.c
index b65a7d9640e1..db8a0a841062 100644
--- a/drivers/perf/arm_spe_pmu.c
+++ b/drivers/perf/arm_spe_pmu.c
@@ -44,7 +44,9 @@
* This allows us to perform the check, i.e, perfmon_capable(),
* in the context of the event owner, once, during the event_init().
*/
-#define SPE_PMU_HW_FLAGS_CX BIT(0)
+#define SPE_PMU_HW_FLAGS_CX 0x00001
+
+static_assert((PERF_EVENT_FLAG_ARCH & SPE_PMU_HW_FLAGS_CX) == SPE_PMU_HW_FLAGS_CX);

static void set_spe_event_has_cx(struct perf_event *event)
{
diff --git a/include/linux/perf/arm_pmu.h b/include/linux/perf/arm_pmu.h
index 0407a38b470a..0356cb6a215d 100644
--- a/include/linux/perf/arm_pmu.h
+++ b/include/linux/perf/arm_pmu.h
@@ -24,10 +24,11 @@
/*
* ARM PMU hw_event flags
*/
-/* Event uses a 64bit counter */
-#define ARMPMU_EVT_64BIT 1
-/* Event uses a 47bit counter */
-#define ARMPMU_EVT_47BIT 2
+#define ARMPMU_EVT_64BIT 0x00001 /* Event uses a 64bit counter */
+#define ARMPMU_EVT_47BIT 0x00002 /* Event uses a 47bit counter */
+
+static_assert((PERF_EVENT_FLAG_ARCH & ARMPMU_EVT_64BIT) == ARMPMU_EVT_64BIT);
+static_assert((PERF_EVENT_FLAG_ARCH & ARMPMU_EVT_47BIT) == ARMPMU_EVT_47BIT);

#define HW_OP_UNSUPPORTED 0xFFFF
#define C(_x) PERF_COUNT_HW_CACHE_##_x
--
2.25.1