Paul E. McKenney b4270ee356
rcu: Permit RCU_NONIDLE() to be used from interrupt context ...
There is a need to use RCU from interrupt context, but either before
rcu_irq_enter() is called or after rcu_irq_exit() is called. If the
interrupt occurs from idle, then lockdep-RCU will complain about such
uses, as they appear to be illegal uses of RCU from the idle loop.
In other environments, RCU_NONIDLE() could be used to properly protect
the use of RCU, but RCU_NONIDLE() currently cannot be invoked except
from process context.
This commit therefore modifies RCU_NONIDLE() to permit its use more
globally.
Reported-by: Steven Rostedt <rostedt@goodmis.org >
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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b4270ee356