kernel/linux.git/include/linux/rtmutex.h, branch v6.6.132

locking/rtmutex: Add rt_mutex_lock_nest_lock() and rt_mutex_lock_killable().

2021-12-04T09:56:23+00:00

The locking selftest for ww-mutex expects to operate directly on the base-mutex which becomes a rtmutex on PREEMPT_RT. Add a rtmutex based implementation of mutex_lock_nest_lock() and mutex_lock_killable() named rt_mutex_lock_nest_lock() abd rt_mutex_lock_killable(). Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Peter Zijlstra (Intel) Link: https://lore.kernel.org/r/20211129174654.668506-5-bigeasy@linutronix.de

locking/rtmutex: Reduce header dependencies, only include

2021-08-17T15:37:26+00:00

We have the following header dependency problem on RT: - needs the definition of 'struct rb_root_cached'. - includes , which includes That works nicely for non-RT enabled kernels, but on RT enabled kernels spinlocks are based on rtmutexes, which creates another circular header dependency as will require . Include instead. Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Thomas Gleixner Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Ingo Molnar Link: https://lore.kernel.org/r/20210815211303.598003167@linutronix.de

locking/rtmutex: Prevent future include recursion hell

2021-08-17T15:27:28+00:00

rtmutex only needs raw_spinlock_t, but it includes spinlock_types.h, which is not a problem on an non RT enabled kernel. RT kernels substitute regular spinlocks with 'sleeping' spinlocks, which are based on rtmutexes, and therefore must be able to include rtmutex.h. Include instead. Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Thomas Gleixner Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Ingo Molnar Link: https://lore.kernel.org/r/20210815211303.428224188@linutronix.de

locking/rtmutex: Provide rt_mutex_base_is_locked()

2021-08-17T15:04:35+00:00

Provide rt_mutex_base_is_locked(), which will be used for various wrapped locking primitives for RT. Signed-off-by: Thomas Gleixner Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Ingo Molnar Link: https://lore.kernel.org/r/20210815211302.899572818@linutronix.de

locking/rtmutex: Split out the inner parts of 'struct rtmutex'

2021-08-17T15:04:01+00:00

RT builds substitutions for rwsem, mutex, spinlock and rwlock around rtmutexes. Split the inner working out so each lock substitution can use them with the appropriate lockdep annotations. This avoids having an extra unused lockdep map in the wrapped rtmutex. No functional change. Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Thomas Gleixner Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Ingo Molnar Link: https://lore.kernel.org/r/20210815211302.784739994@linutronix.de

locking/rtmutex: Remove rt_mutex_is_locked()

2021-08-17T15:00:08+00:00

There are no more users left. Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Thomas Gleixner Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Ingo Molnar Link: https://lore.kernel.org/r/20210815211302.552218335@linutronix.de

locking/rtmutex: Set proper wait context for lockdep

2021-08-17T14:38:50+00:00

RT mutexes belong to the LD_WAIT_SLEEP class. Make them so. Signed-off-by: Thomas Gleixner Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Ingo Molnar Link: https://lore.kernel.org/r/20210815211302.031014562@linutronix.de

locking/rtmutex: Remove empty and unused debug stubs

2021-03-29T13:57:03+00:00

No users or useless and therefore just ballast. Signed-off-by: Thomas Gleixner Signed-off-by: Ingo Molnar Acked-by: Peter Zijlstra (Intel) Link: https://lore.kernel.org/r/20210326153943.549192485@linutronix.de

locking/rtmutex: Consolidate rt_mutex_init()

2021-03-29T13:57:02+00:00

rt_mutex_init() only initializes lockdep if CONFIG_DEBUG_RT_MUTEXES is enabled, which is fine because all lockdep variants select it, but there is no reason to do so. Move the function outside of the CONFIG_DEBUG_RT_MUTEXES block which removes #ifdeffery. Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Thomas Gleixner Signed-off-by: Ingo Molnar Acked-by: Peter Zijlstra (Intel) Link: https://lore.kernel.org/r/20210326153943.437405350@linutronix.de

locking/rtmutex: Remove output from deadlock detector

2021-03-29T13:57:02+00:00

The rtmutex specific deadlock detector predates lockdep coverage of rtmutex and since commit f5694788ad8da ("rt_mutex: Add lockdep annotations") it contains a lot of redundant functionality: - lockdep will detect an potential deadlock before rtmutex-debug has a chance to do so - the deadlock debugging is restricted to rtmutexes which are not associated to futexes and have an active waiter, which is covered by lockdep already Remove the redundant functionality and move actual deadlock WARN() into the deadlock code path. The latter needs a seperate cleanup. Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Thomas Gleixner Signed-off-by: Ingo Molnar Acked-by: Peter Zijlstra (Intel) Link: https://lore.kernel.org/r/20210326153943.320398604@linutronix.de