linux-kernel - [PATCH] thermal: intel_powerclamp: Use bitmap_zalloc/bitmap

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Date:   Sun, 26 Sep 2021 09:17:20 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     rui.zhang@...el.com, daniel.lezcano@...aro.org, amitk@...nel.org
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH] thermal: intel_powerclamp: Use bitmap_zalloc/bitmap_free when applicable

'cpu_clamping_mask' is a bitmap. So use 'bitmap_zalloc()' and
'bitmap_free()' to simplify code, improve the semantic of the code and
avoid some open-coded arithmetic in allocator arguments.

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/thermal/intel/intel_powerclamp.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/thermal/intel/intel_powerclamp.c b/drivers/thermal/intel/intel_powerclamp.c
index a5b58ea89cc6..9b68489a2356 100644
--- a/drivers/thermal/intel/intel_powerclamp.c
+++ b/drivers/thermal/intel/intel_powerclamp.c
@@ -705,10 +705,8 @@ static enum cpuhp_state hp_state;
 static int __init powerclamp_init(void)
 {
 	int retval;
-	int bitmap_size;
 
-	bitmap_size = BITS_TO_LONGS(num_possible_cpus()) * sizeof(long);
-	cpu_clamping_mask = kzalloc(bitmap_size, GFP_KERNEL);
+	cpu_clamping_mask = bitmap_zalloc(num_possible_cpus(), GFP_KERNEL);
 	if (!cpu_clamping_mask)
 		return -ENOMEM;
 
@@ -753,7 +751,7 @@ static int __init powerclamp_init(void)
 exit_unregister:
 	cpuhp_remove_state_nocalls(hp_state);
 exit_free:
-	kfree(cpu_clamping_mask);
+	bitmap_free(cpu_clamping_mask);
 	return retval;
 }
 module_init(powerclamp_init);
@@ -764,7 +762,7 @@ static void __exit powerclamp_exit(void)
 	cpuhp_remove_state_nocalls(hp_state);
 	free_percpu(worker_data);
 	thermal_cooling_device_unregister(cooling_dev);
-	kfree(cpu_clamping_mask);
+	bitmap_free(cpu_clamping_mask);
 
 	cancel_delayed_work_sync(&poll_pkg_cstate_work);
 	debugfs_remove_recursive(debug_dir);
-- 
2.30.2