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authorPaul E. McKenney <paul.mckenney@linaro.org>2012-07-31 10:12:48 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2012-09-23 07:42:49 -0700
commitb4270ee356e5ecef5394ab80c0a0301c1676b7f0 (patch)
treed600c6dcea20363414220b9b369832af97a8a090 /include/linux/rcupdate.h
parent1e3fd2b38cea41f5386bf23440f2cbdd74cf13d0 (diff)
downloadop-kernel-dev-b4270ee356e5ecef5394ab80c0a0301c1676b7f0.zip
op-kernel-dev-b4270ee356e5ecef5394ab80c0a0301c1676b7f0.tar.gz
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>
Diffstat (limited to 'include/linux/rcupdate.h')
-rw-r--r--include/linux/rcupdate.h6
1 files changed, 2 insertions, 4 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index 115ead2..0fbbd52 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -210,14 +210,12 @@ extern void exit_rcu(void);
* to nest RCU_NONIDLE() wrappers, but the nesting level is currently
* quite limited. If deeper nesting is required, it will be necessary
* to adjust DYNTICK_TASK_NESTING_VALUE accordingly.
- *
- * This macro may be used from process-level code only.
*/
#define RCU_NONIDLE(a) \
do { \
- rcu_idle_exit(); \
+ rcu_irq_enter(); \
do { a; } while (0); \
- rcu_idle_enter(); \
+ rcu_irq_exit(); \
} while (0)
/*
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