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93781560b2
Split the pps-gpio interrupt handler into a primary (hardirq) handler that captures the PPS timestamp at interrupt entry, and a threaded handler that processes the event. This produces the same two-part handler structure on both PREEMPT_RT and non-RT kernels. On non-RT kernels the threaded portion runs immediately after the primary, with no behavioral change compared to the previous single-handler implementation. On PREEMPT_RT, where interrupt handlers are force-threaded by default, the previous single-handler implementation captured the timestamp inside the threaded portion, after IRQ-thread scheduling delay. With the split, the timestamp is captured in true hardirq context as it is on non-RT kernels, eliminating a significant source of PPS jitter on RT systems. Link: https://lore.kernel.org/2e32729029fbf6977ecf04665eb00f2efd3e2c17.1780359378.git.calvin@wbinvd.org Signed-off-by: Michael Byczkowski <by@by-online.de> Signed-off-by: Calvin Owens <calvin@wbinvd.org> Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Tested-by: Michael Byczkowski <by@by-online.de> Tested-by: Calvin Owens <calvin@wbinvd.org> Acked-by: Rodolfo Giometti <giometti@enneenne.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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| .. | ||
| clients | ||
| generators | ||
| kapi.c | ||
| kc.c | ||
| kc.h | ||
| Kconfig | ||
| Makefile | ||
| pps.c | ||
| sysfs.c | ||