19 lines
658 B
Diff
19 lines
658 B
Diff
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diff --git a/drivers/pps/clients/pps-gpio.c b/drivers/pps/clients/pps-gpio.c
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index 65d17781d..5ba2aaebe 100644
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--- a/drivers/pps/clients/pps-gpio.c
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+++ b/drivers/pps/clients/pps-gpio.c
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@@ -156,6 +156,13 @@ get_irqf_trigger_flags(const struct pps_gpio_device_data *data)
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IRQF_TRIGGER_FALLING : IRQF_TRIGGER_RISING);
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}
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+ /* The handler timestamps the pulse, so it has to run in hard-irq
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+ * context. Under PREEMPT_RT it would otherwise be force-threaded and
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+ * the timestamp taken after thread wakeup latency, adding microseconds
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+ * of jitter to an edge that should be good to nanoseconds.
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+ */
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+ flags |= IRQF_NO_THREAD;
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+
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return flags;
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}
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