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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 /kernel
parent1e3fd2b38cea41f5386bf23440f2cbdd74cf13d0 (diff)
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 'kernel')
-rw-r--r--kernel/rcutiny.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/rcutiny.c b/kernel/rcutiny.c
index e4163c5af1de..2e073a24d250 100644
--- a/kernel/rcutiny.c
+++ b/kernel/rcutiny.c
@@ -115,6 +115,7 @@ void rcu_irq_exit(void)
rcu_idle_enter_common(newval);
local_irq_restore(flags);
}
+EXPORT_SYMBOL_GPL(rcu_irq_exit);
/* Common code for rcu_idle_exit() and rcu_irq_enter(), see kernel/rcutree.c. */
static void rcu_idle_exit_common(long long oldval)
@@ -172,6 +173,7 @@ void rcu_irq_enter(void)
rcu_idle_exit_common(oldval);
local_irq_restore(flags);
}
+EXPORT_SYMBOL_GPL(rcu_irq_enter);
#ifdef CONFIG_DEBUG_LOCK_ALLOC