user/sven/linux.git/include/linux/spinlock_rt.h, branch v5.15.27Linux Kernel
https://git.stealer.net/cgit.cgi/user/sven/linux.git/atom?h=v5.15.272021-08-17T17:06:13Zlocking/spinlock/rt: Prepare for RT local_lock2021-08-17T17:06:13ZThomas Gleixnertglx@linutronix.de2021-08-15T21:29:27Zurn:sha1:31552385f8e9d0869117014bf8e55ba0497e3ec8
Add the static and runtime initializer mechanics to support the RT variant
of local_lock, which requires the lock type in the lockdep map to be set
to LD_LOCK_PERCPU.
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/20210815211305.967526724@linutronix.de
locking/rwlock: Provide RT variant2021-08-17T15:50:51ZThomas Gleixnertglx@linutronix.de2021-08-15T21:28:28Zurn: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
locking/spinlock: Provide RT variant header: <linux/spinlock_rt.h>2021-08-17T15:43:24ZThomas Gleixnertglx@linutronix.de2021-08-15T21:28:23Zurn:sha1:342a93247e0837101f27bbcca26f402902df98dc
Provide the necessary wrappers around the actual rtmutex based spinlock
implementation.
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/20210815211303.712897671@linutronix.de