[PATCH v2 09/14] KVM: arm64: Use guard() to cleanup usage of arm_pmus_lock
From: Oliver Upton <hidden>
Date: 2025-02-03 18:32:30
Also in:
kvmarm, lkml
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
Get rid of some goto label patterns by using guard() to drop the arm_pmus_lock when returning from a function. Tested-by: Janne Grunau <j@jannau.net> Signed-off-by: Oliver Upton <redacted> --- arch/arm64/kvm/pmu-emul.c | 23 ++++++++--------------- 1 file changed, 8 insertions(+), 15 deletions(-)
diff --git a/arch/arm64/kvm/pmu-emul.c b/arch/arm64/kvm/pmu-emul.c
index 8413a038e6c2..3048e22c240b 100644
--- a/arch/arm64/kvm/pmu-emul.c
+++ b/arch/arm64/kvm/pmu-emul.c@@ -802,26 +802,23 @@ void kvm_host_pmu_init(struct arm_pmu *pmu) if (!pmuv3_implemented(kvm_arm_pmu_get_pmuver_limit())) return; - mutex_lock(&arm_pmus_lock); + guard(mutex)(&arm_pmus_lock); entry = kmalloc(sizeof(*entry), GFP_KERNEL); if (!entry) - goto out_unlock; + return; entry->arm_pmu = pmu; list_add_tail(&entry->entry, &arm_pmus); - -out_unlock: - mutex_unlock(&arm_pmus_lock); } static struct arm_pmu *kvm_pmu_probe_armpmu(void) { - struct arm_pmu *tmp, *pmu = NULL; struct arm_pmu_entry *entry; + struct arm_pmu *pmu; int cpu; - mutex_lock(&arm_pmus_lock); + guard(mutex)(&arm_pmus_lock); /* * It is safe to use a stale cpu to iterate the list of PMUs so long as
@@ -842,17 +839,13 @@ static struct arm_pmu *kvm_pmu_probe_armpmu(void) */ cpu = raw_smp_processor_id(); list_for_each_entry(entry, &arm_pmus, entry) { - tmp = entry->arm_pmu; + pmu = entry->arm_pmu; - if (cpumask_test_cpu(cpu, &tmp->supported_cpus)) { - pmu = tmp; - break; - } + if (cpumask_test_cpu(cpu, &pmu->supported_cpus)) + return pmu; } - mutex_unlock(&arm_pmus_lock); - - return pmu; + return NULL; } static u64 __compute_pmceid(struct arm_pmu *pmu, bool pmceid1)
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2.39.5