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authorPaul E. McKenney <paul.mckenney@linaro.org>2011-07-19 03:25:36 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2011-07-20 11:04:54 -0700
commita841796f11c90d53dbac773be56b04fbee8af272 (patch)
tree9401a53faddecc7c1644565d0e22630028f82bca /Documentation/development-process
parentec433f0c51527426989ea8a38a856d810d739414 (diff)
signal: align __lock_task_sighand() irq disabling and RCU
The __lock_task_sighand() function calls rcu_read_lock() with interrupts and preemption enabled, but later calls rcu_read_unlock() with interrupts disabled. It is therefore possible that this RCU read-side critical section will be preempted and later RCU priority boosted, which means that rcu_read_unlock() will call rt_mutex_unlock() in order to deboost itself, but with interrupts disabled. This results in lockdep splats, so this commit nests the RCU read-side critical section within the interrupt-disabled region of code. This prevents the RCU read-side critical section from being preempted, and thus prevents the attempt to deboost with interrupts disabled. It is quite possible that a better long-term fix is to make rt_mutex_unlock() disable irqs when acquiring the rt_mutex structure's ->wait_lock. Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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