linux-kernel - [PATCH] KVM: arm64: Fix the return value of smp_call_function

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Date:   Mon, 18 Jan 2021 17:31:37 +0800
From:   Yejune Deng <yejune.deng@...il.com>
To:     maz@...nel.org, james.morse@....com, julien.thierry.kdev@...il.com,
        suzuki.poulose@....com, catalin.marinas@....com, will@...nel.org
Cc:     linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org, yejune.deng@...il.com
Subject: [PATCH] KVM: arm64: Fix the return value of smp_call_function_single()

In smp_call_function_single(), the 3rd parameter isn't the return value
and it's always positive. But it may return a negative value. So the
'ret' is should be the return value of the smp_call_function_single().

In check_kvm_target_cpu(), 'phys_target' is more readable than 'ret'.

Signed-off-by: Yejune Deng <yejune.deng@...il.com>
---
 arch/arm64/kvm/arm.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 04c44853b103..5fa5c04106de 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -1815,9 +1815,9 @@ static int init_hyp_mode(void)
 	return err;
 }
 
-static void check_kvm_target_cpu(void *ret)
+static void check_kvm_target_cpu(void *phys_target)
 {
-	*(int *)ret = kvm_target_cpu();
+	*(int *)phys_target = kvm_target_cpu();
 }
 
 struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr)
@@ -1879,7 +1879,7 @@ void kvm_arch_irq_bypass_start(struct irq_bypass_consumer *cons)
 int kvm_arch_init(void *opaque)
 {
 	int err;
-	int ret, cpu;
+	int ret, cpu, phys_target;
 	bool in_hyp_mode;
 
 	if (!is_hyp_mode_available()) {
@@ -1900,7 +1900,7 @@ int kvm_arch_init(void *opaque)
 			 "Only trusted guests should be used on this system.\n");
 
 	for_each_online_cpu(cpu) {
-		smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1);
+		ret = smp_call_function_single(cpu, check_kvm_target_cpu, &phys_target, 1);
 		if (ret < 0) {
 			kvm_err("Error, CPU %d not supported!\n", cpu);
 			return -ENODEV;
-- 
2.29.0