linux-kernel - [PATCH] cpuidle: dt: fix opencoded for_each_cpu() in idle_state

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Message-ID: <20250604213908.27819-1-yury.norov@gmail.com>
Date: Wed,  4 Jun 2025 17:39:06 -0400
From: Yury Norov <yury.norov@...il.com>
To: "Rafael J. Wysocki" <rafael@...nel.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: "Yury Norov [NVIDIA]" <yury.norov@...il.com>
Subject: [PATCH] cpuidle: dt: fix opencoded for_each_cpu() in idle_state_valid()

From: Yury Norov [NVIDIA] <yury.norov@...il.com>

The function opencodes the for_each_cpu_from() by using an open for-loop.
Fix that in sake of readability.

While there, drop the 'valid' variable as it's pretty useless here.

Signed-off-by: Yury Norov [NVIDIA] <yury.norov@...il.com>
---
 drivers/cpuidle/dt_idle_states.c | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/drivers/cpuidle/dt_idle_states.c b/drivers/cpuidle/dt_idle_states.c
index 97feb7d8fb23..558d49838990 100644
--- a/drivers/cpuidle/dt_idle_states.c
+++ b/drivers/cpuidle/dt_idle_states.c
@@ -98,7 +98,6 @@ static bool idle_state_valid(struct device_node *state_node, unsigned int idx,
 {
 	int cpu;
 	struct device_node *cpu_node, *curr_state_node;
-	bool valid = true;
 
 	/*
 	 * Compare idle state phandles for index idx on all CPUs in the
@@ -107,20 +106,17 @@ static bool idle_state_valid(struct device_node *state_node, unsigned int idx,
 	 * retrieved from. If a mismatch is found bail out straight
 	 * away since we certainly hit a firmware misconfiguration.
 	 */
-	for (cpu = cpumask_next(cpumask_first(cpumask), cpumask);
-	     cpu < nr_cpu_ids; cpu = cpumask_next(cpu, cpumask)) {
+	cpu = cpumask_first(cpumask) + 1;
+	for_each_cpu_from(cpu, cpumask) {
 		cpu_node = of_cpu_device_node_get(cpu);
 		curr_state_node = of_get_cpu_state_node(cpu_node, idx);
-		if (state_node != curr_state_node)
-			valid = false;
-
 		of_node_put(curr_state_node);
 		of_node_put(cpu_node);
-		if (!valid)
-			break;
+		if (state_node != curr_state_node)
+			return false;
 	}
 
-	return valid;
+	return true;
 }
 
 /**
-- 
2.43.0