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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/drivers/leds/trigger/ledtrig-cpu.c
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@@ -1,22 +1,22 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * ledtrig-cpu.c - LED trigger based on CPU activity
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  *
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- * This LED trigger will be registered for each possible CPU and named as
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- * cpu0, cpu1, cpu2, cpu3, etc.
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+ * This LED trigger will be registered for first 8 CPUs and named
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+ * as cpu0..cpu7. There's additional trigger called cpu that
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+ * is on when any CPU is active.
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+ *
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+ * If you want support for arbitrary number of CPUs, make it one trigger,
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+ * with additional sysfs file selecting which CPU to watch.
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  *
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  * It can be bound to any LED just like other triggers using either a
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  * board file or via sysfs interface.
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  *
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  * An API named ledtrig_cpu is exported for any user, who want to add CPU
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- * activity indication in their code
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+ * activity indication in their code.
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  *
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  * Copyright 2011 Linus Walleij <linus.walleij@linaro.org>
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  * Copyright 2011 - 2012 Bryan Wu <bryan.wu@canonical.com>
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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- *
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  */
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 #include <linux/kernel.h>
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@@ -149,6 +149,9 @@
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 	for_each_possible_cpu(cpu) {
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 		struct led_trigger_cpu *trig = &per_cpu(cpu_trig, cpu);
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+		if (cpu >= 8)
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+			continue;
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+
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 		snprintf(trig->name, MAX_NAME_LEN, "cpu%d", cpu);
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 		led_trigger_register_simple(trig->name, &trig->_trig);