starfive-tech/linux.git/include/linux/rwlock_rt.h, branch VF2_v3.7.5StarFive Tech Linux Kernel for VisionFive (JH7110) boards (mirror)https://git.radix-linux.su/starfive-tech/linux.git/atom?h=VF2_v3.7.52021-08-17T15:50:51+00:00locking/rwlock: Provide RT variant2021-08-17T15:50:51+00:00Thomas Gleixnertglx@linutronix.de2021-08-15T21:28:28+00:00urn:sha1:8282947f67345246b4a6344dbceb07484d3d4dad
Similar to rw_semaphores, on RT the rwlock substitution is not writer fair,
because it's not feasible to have a writer inherit its priority to
multiple readers. Readers blocked on a writer follow the normal rules of
priority inheritance. Like RT spinlocks, RT rwlocks are state preserving
across the slow lock operations (contended case).
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20210815211303.882793524@linutronix.de