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authorThomas Gleixner <tglx@linutronix.de>2021-08-15 23:28:28 +0200
committerIngo Molnar <mingo@kernel.org>2021-08-17 17:50:51 +0200
commit8282947f67345246b4a6344dbceb07484d3d4dad (patch)
treeaeb316bc3ec77d94c819bb6bea21e45c7296fcd9 /kernel/Kconfig.locks
parent0f383b6dc96e976dfbf2721b0bf10bd96103b341 (diff)
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.locks2
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

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