[PATCH -next] perf: arm_pmu: Fix build on arm if !CONFIG_GENERIC_ARCH_TOPOLOGY

[Yicong Yang]

The SMT implementation is retrieved by topology_core_has_smt() which
depends on CONFIG_GENERIC_ARCH_TOPOLOGY. The config is optional on
arm platforms so protect the usage with CONFIG_GENERIC_ARCH_TOPOLOGY.

Fixes: c3d78c34ad00 ("perf: arm_pmuv3: Don't use PMCCNTR_EL0 on SMT cores")
Reported-by: kernel test robot <lkp at intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202511041757.vuCGOmFc-lkp@intel.com/
Signed-off-by: Yicong Yang <yangyccccc at gmail.com>
---
 drivers/perf/arm_pmu.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c
index ae437791b5f8..f38bdeb906f0 100644
--- a/drivers/perf/arm_pmu.c
+++ b/drivers/perf/arm_pmu.c
@@ -925,11 +925,13 @@ int armpmu_register(struct arm_pmu *pmu)
 	if (ret)
 		return ret;
 
+#ifdef CONFIG_GENERIC_ARCH_TOPOLOGY
 	/*
 	 * By this stage we know our supported CPUs on either DT/ACPI platforms,
 	 * detect the SMT implementation.
 	 */
 	pmu->has_smt = topology_core_has_smt(cpumask_first(&pmu->supported_cpus));
+#endif
 
 	if (!pmu->set_event_filter)
 		pmu->pmu.capabilities |= PERF_PMU_CAP_NO_EXCLUDE;
-- 
2.50.1 (Apple Git-155)