4 commits

Author	SHA1	Message	Date
Mark Johnston	efb8f0b8db	linuxkpi: Mitigate a seqlock livelock ... Disable preemption in seqlock write sections when using the _irqsave variant. This ensures that a writer can't be preempted and subsequently starved by a reader running in a callout handler on the same CPU. This fixes occasional display hangs seen when using the i915 driver. Tested by: emaste, wulf Reviewed by: wulf, hselasky MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D35021	2022-04-25 09:13:03 -04:00
Mateusz Guzik	c9a995994b	seqc: rename seqc_consistent_nomb to seqc_consistent_no_fence ... For more consistency with other primitives.	2022-02-15 17:51:07 +00:00
Vladimir Kondratyev	307f78f3ed	LinuxKPI: Constantly use _LINUXKPI_ prefix in include guards ... MFC after: 1 week Reviewed by: bz, emaste, hselasky, manu Differential Revision: https://reviews.freebsd.org/D33562	2022-01-10 22:49:38 +03:00
Vladimir Kondratyev	8b33cb8303	LinuxKPI: Implement sequence counters and sequential locks ... as a thin wrapper around native version found in sys/seqc.h. This replaces out-of-base GPLv2-licensed code used by drm-kmod. Reviewed by: hselasky Differential revision: https://reviews.freebsd.org/D31006	2021-07-05 03:20:55 +03:00