linux-kernel - [PATCH 2/3] arm64/perf: Assert all platform event flags are within PERF_EVENT_FLAG

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Date:   Mon, 29 Aug 2022 12:25:06 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        peterz@...radead.org
Cc:     Anshuman Khandual <anshuman.khandual@....com>,
        Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 2/3] 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.

Cc: Will Deacon <will@...nel.org>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-perf-users@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
 arch/arm64/kernel/perf_event.c  | 1 +
 drivers/perf/apple_m1_cpu_pmu.c | 1 +
 drivers/perf/arm_spe_pmu.c      | 1 +
 3 files changed, 3 insertions(+)

diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c
index cb69ff1e6138..cf9cedb07f92 100644
--- a/arch/arm64/kernel/perf_event.c
+++ b/arch/arm64/kernel/perf_event.c
@@ -1390,6 +1390,7 @@ static struct platform_driver armv8_pmu_driver = {
 
 static int __init armv8_pmu_driver_init(void)
 {
+	BUILD_BUG_ON(~PERF_EVENT_FLAG_ARCH & ARMPMU_EVT_64BIT);
 	if (acpi_disabled)
 		return platform_driver_register(&armv8_pmu_driver);
 	else
diff --git a/drivers/perf/apple_m1_cpu_pmu.c b/drivers/perf/apple_m1_cpu_pmu.c
index 979a7c2b4f56..9ec8c694d0f2 100644
--- a/drivers/perf/apple_m1_cpu_pmu.c
+++ b/drivers/perf/apple_m1_cpu_pmu.c
@@ -568,6 +568,7 @@ MODULE_DEVICE_TABLE(of, m1_pmu_of_device_ids);
 
 static int m1_pmu_device_probe(struct platform_device *pdev)
 {
+	BUILD_BUG_ON(~PERF_EVENT_FLAG_ARCH & ARMPMU_EVT_47BIT);
 	return arm_pmu_device_probe(pdev, m1_pmu_of_device_ids, NULL);
 }
 
diff --git a/drivers/perf/arm_spe_pmu.c b/drivers/perf/arm_spe_pmu.c
index b65a7d9640e1..74344abf4b11 100644
--- a/drivers/perf/arm_spe_pmu.c
+++ b/drivers/perf/arm_spe_pmu.c
@@ -1276,6 +1276,7 @@ static int __init arm_spe_pmu_init(void)
 	if (ret)
 		cpuhp_remove_multi_state(arm_spe_pmu_online);
 
+	BUILD_BUG_ON(~PERF_EVENT_FLAG_ARCH & SPE_PMU_HW_FLAGS_CX);
 	return ret;
 }
 
-- 
2.25.1