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KVM: x86: avoid useless copy of cpufreq policy 

struct cpufreq_policy is quite big and it is not a good idea
to allocate one on the stack.  Just use cpufreq_cpu_get and
cpufreq_cpu_put which is even simpler.

Reported-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2020-02-28 10:49:10 +01:00
parent 4f337faf1c
commit aaec7c03de
1 changed files with 5 additions and 5 deletions
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10
arch/x86/kvm/x86.c
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@ -7190,15 +7190,15 @@ static void kvm_timer_init(void)
if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) {
#ifdef CONFIG_CPU_FREQ
struct cpufreq_policy policy;
struct cpufreq_policy *policy;
int cpu;
memset(&policy, 0, sizeof(policy));
cpu = get_cpu();
cpufreq_get_policy(&policy, cpu);
if (policy.cpuinfo.max_freq)
max_tsc_khz = policy.cpuinfo.max_freq;
policy = cpufreq_cpu_get(cpu);
if (policy && policy->cpuinfo.max_freq)
max_tsc_khz = policy->cpuinfo.max_freq;
put_cpu();
cpufreq_cpu_put(policy);
#endif
cpufreq_register_notifier(&kvmclock_cpufreq_notifier_block,
CPUFREQ_TRANSITION_NOTIFIER);