22 Jun, 2014
1 commit
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The conditions under which deadlock detection is conducted are unclear
and undocumented.Add constants instead of using 0/1 and provide a selection function
which hides the additional debug dependency from the calling code.Add comments where needed.
Signed-off-by: Thomas Gleixner
Cc: Peter Zijlstra
Reviewed-by: Steven Rostedt
Cc: Lai Jiangshan
Link: http://lkml.kernel.org/r/20140522031949.947264874@linutronix.de
Signed-off-by: Thomas Gleixner
07 Jun, 2014
1 commit
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Even in the case when deadlock detection is not requested by the
caller, we can detect deadlocks. Right now the code stops the lock
chain walk and keeps the waiter enqueued, even on itself. Silly not to
yell when such a scenario is detected and to keep the waiter enqueued.Return -EDEADLK unconditionally and handle it at the call sites.
The futex calls return -EDEADLK. The non futex ones dequeue the
waiter, throw a warning and put the task into a schedule loop.Tagged for stable as it makes the code more robust.
Signed-off-by: Thomas Gleixner
Cc: Steven Rostedt
Cc: Peter Zijlstra
Cc: Brad Mouring
Link: http://lkml.kernel.org/r/20140605152801.836501969@linutronix.de
Cc: stable@vger.kernel.org
Signed-off-by: Thomas Gleixner
06 Nov, 2013
1 commit
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Suggested-by: Ingo Molnar
Signed-off-by: Peter Zijlstra
Link: http://lkml.kernel.org/n/tip-p9ijt8div0hwldexwfm4nlhj@git.kernel.org
[ Fixed build failure in kernel/rcu/tree_plugin.h. ]
Signed-off-by: Ingo Molnar
