[PATCH v3] cpuidle: psci: Init cpuidle only for present CPUs

[Jacky Bai]

for_each_possible_cpu() is currently used to initialize cpuidle
in the PSCI cpuidle driver.

However, in cpu_dev_register_generic(), for_each_present_cpu()
is used to register CPU devices which means the CPU devices are
only registered for present CPUs and not all possible CPUs.

With nosmp or maxcpus=0, only the boot CPU is present, leading
to the failure:

  |  Failed to register cpuidle device for cpu1

Change for_each_possible_cpu() to for_each_present_cpu() in the
PSCI cpuidle driver to ensure it only registers cpuidle devices
for CPUs that are actually present.

Fixes: b0c69e1214bc ("drivers: base: Use present CPUs in GENERIC_CPU_DEVICES")
Reviewed-by: Dhruva Gole <d-gole@xxxxxx>
Reviewed-by: Sudeep Holla <sudeep.holla@xxxxxxx>
Tested-by: Yuanjie Yang <quic_yuanjiey@xxxxxxxxxxx>
Signed-off-by: Jacky Bai <ping.bai@xxxxxxx>
---
 - v2 changes:
  - Improve the changelog as suggested by Sudeep
---
 drivers/cpuidle/cpuidle-psci.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/cpuidle/cpuidle-psci.c b/drivers/cpuidle/cpuidle-psci.c
index 2562dc001fc1..00117e9b33e8 100644
--- a/drivers/cpuidle/cpuidle-psci.c
+++ b/drivers/cpuidle/cpuidle-psci.c
@@ -410,7 +410,7 @@ static int psci_cpuidle_probe(struct platform_device *pdev)
 	struct cpuidle_driver *drv;
 	struct cpuidle_device *dev;
 
-	for_each_possible_cpu(cpu) {
+	for_each_present_cpu(cpu) {
 		ret = psci_idle_init_cpu(&pdev->dev, cpu);
 		if (ret)
 			goto out_fail;
-- 
2.34.1