From: James Clark <james.clark@arm.com>
To: linux-arm-kernel@lists.infradead.org,
linux-perf-users@vger.kernel.org, linux-next@vger.kernel.org,
will@kernel.org, u.kleine-koenig@pengutronix.de
Cc: James Clark <james.clark@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Nathan Chancellor <nathan@kernel.org>,
Nick Desaulniers <ndesaulniers@google.com>,
Bill Wendling <morbo@google.com>,
Justin Stitt <justinstitt@google.com>,
Anshuman Khandual <anshuman.khandual@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
linux-kernel@vger.kernel.org, llvm@lists.linux.dev
Subject: [PATCH 1/2] arm: perf: Fix ARCH=arm build with GCC in armv8pmu_write_evtype()
Date: Fri, 15 Dec 2023 15:00:38 +0000 [thread overview]
Message-ID: <20231215150040.3342183-2-james.clark@arm.com> (raw)
In-Reply-To: <20231215150040.3342183-1-james.clark@arm.com>
LLVM ignores everything inside the if statement and doesn't generate
errors, but GCC doesn't ignore it, resulting in the following error:
drivers/perf/arm_pmuv3.c: In function ‘armv8pmu_write_evtype’:
include/linux/bits.h:34:29: error: left shift count >= width of type [-Werror=shift-count-overflow]
34 | (((~UL(0)) - (UL(1) << (l)) + 1) & \
Fix it by changing the if to #if.
Fixes: 3115ee021bfb ("arm64: perf: Include threshold control fields in PMEVTYPER mask")
Reported-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Closes: https://lore.kernel.org/linux-arm-kernel/20231215120817.h2f3akgv72zhrtqo@pengutronix.de/
Signed-off-by: James Clark <james.clark@arm.com>
---
drivers/perf/arm_pmuv3.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/perf/arm_pmuv3.c b/drivers/perf/arm_pmuv3.c
index 23fa6c5da82c..3ed2086cefc3 100644
--- a/drivers/perf/arm_pmuv3.c
+++ b/drivers/perf/arm_pmuv3.c
@@ -631,8 +631,9 @@ static void armv8pmu_write_evtype(int idx, unsigned long val)
ARMV8_PMU_EXCLUDE_EL0 |
ARMV8_PMU_EXCLUDE_EL1;
- if (IS_ENABLED(CONFIG_ARM64))
- mask |= ARMV8_PMU_EVTYPE_TC | ARMV8_PMU_EVTYPE_TH;
+#if IS_ENABLED(CONFIG_ARM64)
+ mask |= ARMV8_PMU_EVTYPE_TC | ARMV8_PMU_EVTYPE_TH;
+#endif
val &= mask;
write_pmevtypern(counter, val);
--
2.34.1
next prev parent reply other threads:[~2023-12-15 15:01 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-15 15:00 [PATCH 0/2] arm: perf: Fix ARCH=arm build with GCC James Clark
2023-12-15 15:00 ` James Clark [this message]
2023-12-15 15:18 ` [PATCH 1/2] arm: perf: Fix ARCH=arm build with GCC in armv8pmu_write_evtype() Uwe Kleine-König
2023-12-15 16:21 ` Mark Rutland
2023-12-15 17:42 ` James Clark
2023-12-15 15:00 ` [PATCH 2/2] arm: perf: Fix ARCH=arm build with GCC in armv8pmu_set_event_filter() James Clark
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