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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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parent
1e3fd2b38c
commit
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2 changed files with 4 additions and 4 deletions
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@ -210,14 +210,12 @@ extern void exit_rcu(void);
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* to nest RCU_NONIDLE() wrappers, but the nesting level is currently
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* quite limited. If deeper nesting is required, it will be necessary
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* to adjust DYNTICK_TASK_NESTING_VALUE accordingly.
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*
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* This macro may be used from process-level code only.
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*/
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#define RCU_NONIDLE(a) \
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do { \
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rcu_idle_exit(); \
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rcu_irq_enter(); \
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do { a; } while (0); \
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rcu_idle_enter(); \
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rcu_irq_exit(); \
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} while (0)
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/*
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