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leds: trigger: disable CPU trigger on -RT
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as it triggers:
|CPU: 0 PID: 0 Comm: swapper Not tainted 3.12.8-rt10 raspberrypi#141
|[<c0014aa4>] (unwind_backtrace+0x0/0xf8) from [<c0012788>] (show_stack+0x1c/0x20)
|[<c0012788>] (show_stack+0x1c/0x20) from [<c043c8dc>] (dump_stack+0x20/0x2c)
|[<c043c8dc>] (dump_stack+0x20/0x2c) from [<c004c5e8>] (__might_sleep+0x13c/0x170)
|[<c004c5e8>] (__might_sleep+0x13c/0x170) from [<c043f270>] (__rt_spin_lock+0x28/0x38)
|[<c043f270>] (__rt_spin_lock+0x28/0x38) from [<c043fa00>] (rt_read_lock+0x68/0x7c)
|[<c043fa00>] (rt_read_lock+0x68/0x7c) from [<c036cf74>] (led_trigger_event+0x2c/0x5c)
|[<c036cf74>] (led_trigger_event+0x2c/0x5c) from [<c036e0bc>] (ledtrig_cpu+0x54/0x5c)
|[<c036e0bc>] (ledtrig_cpu+0x54/0x5c) from [<c000ffd8>] (arch_cpu_idle_exit+0x18/0x1c)
|[<c000ffd8>] (arch_cpu_idle_exit+0x18/0x1c) from [<c00590b8>] (cpu_startup_entry+0xa8/0x234)
|[<c00590b8>] (cpu_startup_entry+0xa8/0x234) from [<c043b2cc>] (rest_init+0xb8/0xe0)
|[<c043b2cc>] (rest_init+0xb8/0xe0) from [<c061ebe0>] (start_kernel+0x2c4/0x380)

Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
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@0xa71a5
Sebastian Andrzej Siewior authored and 0xa71a5 committed Feb 5, 2020
1 parent c1425f5 commit 20f8a27
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1 change: 1 addition & 0 deletions drivers/leds/trigger/Kconfig
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Original file line number Diff line number Diff line change
Expand Up @@ -63,6 +63,7 @@ config LEDS_TRIGGER_BACKLIGHT

config LEDS_TRIGGER_CPU
bool "LED CPU Trigger"
depends on !PREEMPT_RT_BASE
help
This allows LEDs to be controlled by active CPUs. This shows
the active CPUs across an array of LEDs so you can see which
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