linux-kernel - [tip: perf/core] arm64/perf: Assert all platform event flags are within PERF_EVENT_FLAG

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Date:   Fri, 09 Sep 2022 08:52:44 -0000
From:   "tip-bot2 for Anshuman Khandual" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Anshuman Khandual <anshuman.khandual@....com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        James Clark <james.clark@....com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: perf/core] arm64/perf: Assert all platform event flags are
 within PERF_EVENT_FLAG_ARCH

The following commit has been merged into the perf/core branch of tip:

Commit-ID:     91207f62616f9f51b52436364e6d064f002e9112
Gitweb:        https://git.kernel.org/tip/91207f62616f9f51b52436364e6d064f002e9112
Author:        Anshuman Khandual <anshuman.khandual@....com>
AuthorDate:    Wed, 07 Sep 2022 14:49:23 +05:30
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Wed, 07 Sep 2022 21:54:01 +02:00

arm64/perf: Assert all platform event flags are within PERF_EVENT_FLAG_ARCH

Ensure all platform specific event flags are within PERF_EVENT_FLAG_ARCH.

Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: James Clark <james.clark@....com>
Link: https://lkml.kernel.org/r/20220907091924.439193-4-anshuman.khandual@arm.com
---
 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 b65a7d9..db8a0a8 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 0407a38..0356cb6 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