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Merge branch 'linus' into rt/head with a pile of conflicts.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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rt_read_trylock() and rt_down_read_trylock() take the lock / semaphore
unconditionally when it is write locked. Check read_depth if current
owns the lock. If it's 0 we know it is write locked and return 0.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Add the missing function
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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The current code of rt_downgrade_write simply does a BUG(). There
are places in the kernel that uses this code, and will crash a runnning
preempt-rt kernel.
The rt_downgrade_write converts a rwsem held for write into a rwsem
held for read without ever releasing the semaphore. In -rt, the rwsems
are simply a mutex. There is nothing different between a rwsem held
for write, and one held for read. The difference is that one held for
read can nest.
This patch changes the BUG_ON() to simply BUG if the caller is not
the owner of the semaphore.
This patch comes from my rt-git repo, and has been tested there.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Clark Williams <clark.williams@gmail.com>
Cc: "Luis Claudio R. Goncalves" <lclaudio@uudg.org>
LKML-Reference: <alpine.DEB.2.00.0904151142420.31828@gandalf.stny.rr.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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recursive rwlocks are only allowed for recursive reads. recursive
rwsems are not allowed at all.
Follow up to Jan Blunks fix.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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This patch removes the stupid "Read locks within the self-held write
lock succeed" behaviour. This is breaking in mm_take_all_locks() since
it is quite common to ensure that a lock is taken with
BUG_ON(down_read_trylock(&mm->mmap_sem)).
Signed-off-by: Jan Blunck <jblunck@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Map spinlocks, rwlocks, rw_semaphores and semaphores to the rt_mutex
based locking functions for preempt-rt.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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