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Subject[PATCH] cpufreq: Detect spurious invocations of update_policy_cpu()
Date
The function update_policy_cpu() is expected to be called when the policy->cpu
of a cpufreq policy is to be changed: ie., the new CPU nominated to become the
policy->cpu is different from the old one.

Print a warning if it is invoked with new_cpu == old_cpu, since such an
invocation might hint at a faulty logic in the caller.

Suggested-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
---

drivers/cpufreq/cpufreq.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 43c24aa..2084132 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -949,7 +949,7 @@ static void cpufreq_policy_free(struct cpufreq_policy *policy)

static void update_policy_cpu(struct cpufreq_policy *policy, unsigned int cpu)
{
- if (cpu == policy->cpu)
+ if (WARN_ON(cpu == policy->cpu))
return;

policy->last_cpu = policy->cpu;


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