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| author | Thomas Gleixner <tglx@linutronix.de> | 2021-08-15 23:28:28 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2021-08-17 17:50:51 +0200 |
| commit | 8282947f67345246b4a6344dbceb07484d3d4dad (patch) | |
| tree | aeb316bc3ec77d94c819bb6bea21e45c7296fcd9 /kernel/Kconfig.locks | |
| parent | 0f383b6dc96e976dfbf2721b0bf10bd96103b341 (diff) | |
| download | lwn-8282947f67345246b4a6344dbceb07484d3d4dad.tar.gz lwn-8282947f67345246b4a6344dbceb07484d3d4dad.zip | |
locking/rwlock: Provide RT variant
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
Diffstat (limited to 'kernel/Kconfig.locks')
| -rw-r--r-- | kernel/Kconfig.locks | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/Kconfig.locks b/kernel/Kconfig.locks index 3de8fd11873b..4198f0273ecd 100644 --- a/kernel/Kconfig.locks +++ b/kernel/Kconfig.locks @@ -251,7 +251,7 @@ config ARCH_USE_QUEUED_RWLOCKS config QUEUED_RWLOCKS def_bool y if ARCH_USE_QUEUED_RWLOCKS - depends on SMP + depends on SMP && !PREEMPT_RT config ARCH_HAS_MMIOWB bool |