https://github.com/torvalds/linux
Revision 9d3e2d02f54160725d97f4ab1e1e8de493fbf33a authored by Sebastian Andrzej Siewior on 27 February 2015, 16:57:09 UTC, committed by Ingo Molnar on 01 March 2015, 08:45:06 UTC
The "usual" path is:
- rt_mutex_slowlock()
- set_current_state()
- task_blocks_on_rt_mutex() (ret 0)
- __rt_mutex_slowlock()
- sleep or not but do return with __set_current_state(TASK_RUNNING)
- back to caller.
In the early error case where task_blocks_on_rt_mutex() return
-EDEADLK we never change the task's state back to RUNNING. I
assume this is intended. Without this change after ww_mutex
using rt_mutex the selftest passes but later I get plenty of:
| bad: scheduling from the idle thread!
backtraces.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Mike Galbraith <umgwanakikbuti@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: afffc6c1805d ("locking/rtmutex: Optimize setting task running after being blocked")
Link: http://lkml.kernel.org/r/1425056229-22326-4-git-send-email-bigeasy@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
1 parent 895c8b7
Tip revision: 9d3e2d02f54160725d97f4ab1e1e8de493fbf33a authored by Sebastian Andrzej Siewior on 27 February 2015, 16:57:09 UTC
locking/rtmutex: Set state back to running on error
locking/rtmutex: Set state back to running on error
Tip revision: 9d3e2d0
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