[PATCH v2 3/3] arm64: cpufeature: Use pmuv3_implemented() function

[James Clark]

Other places that are doing this version comparison are already using
pmuv3_implemented(), so might as well use it here too for consistency.

Signed-off-by: James Clark <james.clark@xxxxxxxxxx>
---
 arch/arm/include/asm/arm_pmuv3.h |  7 +++++++
 arch/arm64/kernel/cpufeature.c   | 12 ++----------
 2 files changed, 9 insertions(+), 10 deletions(-)

diff --git a/arch/arm/include/asm/arm_pmuv3.h b/arch/arm/include/asm/arm_pmuv3.h
index 2ec0e5e83fc9..ecfede0c0348 100644
--- a/arch/arm/include/asm/arm_pmuv3.h
+++ b/arch/arm/include/asm/arm_pmuv3.h
@@ -238,6 +238,13 @@ static inline void kvm_vcpu_pmu_resync_el0(void) {}
 
 static inline bool pmuv3_implemented(int pmuver)
 {
+	/*
+	 * PMUVer follows the standard ID scheme for an unsigned field with the
+	 * exception of 0xF (IMP_DEF) which is treated specially and implies
+	 * FEAT_PMUv3 is not implemented.
+	 *
+	 * See DDI0487L.a D24.1.3.2 for more details.
+	 */
 	return !(pmuver == ARMV8_PMU_DFR_VER_IMP_DEF ||
 		 pmuver == ARMV8_PMU_DFR_VER_NI);
 }
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 07abdfd40756..cc9783b26443 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -77,6 +77,7 @@
 #include <linux/percpu.h>
 #include <linux/sched/isolation.h>
 
+#include <asm/arm_pmuv3.h>
 #include <asm/cpu.h>
 #include <asm/cpufeature.h>
 #include <asm/cpu_ops.h>
@@ -1927,19 +1928,10 @@ static bool has_pmuv3(const struct arm64_cpu_capabilities *entry, int scope)
 	u64 dfr0 = read_sanitised_ftr_reg(SYS_ID_AA64DFR0_EL1);
 	unsigned int pmuver;
 
-	/*
-	 * PMUVer follows the standard ID scheme for an unsigned field with the
-	 * exception of 0xF (IMP_DEF) which is treated specially and implies
-	 * FEAT_PMUv3 is not implemented.
-	 *
-	 * See DDI0487L.a D24.1.3.2 for more details.
-	 */
 	pmuver = cpuid_feature_extract_unsigned_field(dfr0,
 						      ID_AA64DFR0_EL1_PMUVer_SHIFT);
-	if (pmuver == ID_AA64DFR0_EL1_PMUVer_IMP_DEF)
-		return false;
 
-	return pmuver >= ID_AA64DFR0_EL1_PMUVer_IMP;
+	return pmuv3_implemented(pmuver);
 }
 #endif
 

-- 
2.34.1