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From:   Junwen Wu <wudaemon@163.com>
To:     rafael@kernel.org, daniel.lezcano@linaro.org, amitk@kernel.org,
        rui.zhang@intel.com
Cc:     linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
        Junwen Wu <wudaemon@163.com>
Subject: [PATCH v1] thermal/core: change mm alloc method to avoid kernel warning
Date:   Sun, 17 Apr 2022 12:56:01 +0000
Message-Id: <20220417125601.18535-1-wudaemon@163.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Very high cooling device max state value makes cooling device stats
buffer allocation fails,like below.Using kzvalloc instead of kzalloc
can avoid this issue.

[    7.392644]WARNING: CPU: 7 PID: 1747 at mm/page_alloc.c:5090 __alloc_pages_nodemask+0x1c0/0x3dc
[    7.392989]Call trace:
[    7.392992]__alloc_pages_nodemask+0x1c0/0x3dc
[    7.392995]kmalloc_order+0x54/0x358
[    7.392997]kmalloc_order_trace+0x34/0x1bc
[    7.393001]__kmalloc+0x5cc/0x9c8
[    7.393005]thermal_cooling_device_setup_sysfs+0x90/0x218
[    7.393008]__thermal_cooling_device_register+0x160/0x7a4
[    7.393012]thermal_of_cooling_device_register+0x14/0x24
[    7.393140]backlight_cdev_register+0x88/0x100 [msm_drm]

Signed-off-by: Junwen Wu <wudaemon@163.com>
---
 drivers/thermal/thermal_sysfs.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/thermal/thermal_sysfs.c b/drivers/thermal/thermal_sysfs.c
index f154bada2906..361e0d0c241b 100644
--- a/drivers/thermal/thermal_sysfs.c
+++ b/drivers/thermal/thermal_sysfs.c
@@ -829,7 +829,7 @@ static void cooling_device_stats_setup(struct thermal_cooling_device *cdev)
 	var += sizeof(*stats->time_in_state) * states;
 	var += sizeof(*stats->trans_table) * states * states;
 
-	stats = kzalloc(var, GFP_KERNEL);
+	stats = kvzalloc(var, GFP_KERNEL);
 	if (!stats)
 		return;
 
@@ -848,7 +848,7 @@ static void cooling_device_stats_setup(struct thermal_cooling_device *cdev)
 
 static void cooling_device_stats_destroy(struct thermal_cooling_device *cdev)
 {
-	kfree(cdev->stats);
+	kvfree(cdev->stats);
 	cdev->stats = NULL;
 }
 
-- 
2.25.1