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authorFrederic Weisbecker <fweisbec@gmail.com>2012-07-11 20:26:30 +0200
committerFrederic Weisbecker <fweisbec@gmail.com>2012-09-26 15:44:04 +0200
commit2b1d5024e17be459aa6385763ca3faa8f01c52d9 (patch)
tree45d1ea5872eea69b7f0443086d98ddbcbc221b94 /kernel
parent9a0c6fef423528ba5b62aa31b29aabf689eb8f70 (diff)
rcu: Settle config for userspace extended quiescent state
Create a new config option under the RCU menu that put CPUs under RCU extended quiescent state (as in dynticks idle mode) when they run in userspace. This require some contribution from architectures to hook into kernel and userspace boundaries. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Alessio Igor Bogani <abogani@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Avi Kivity <avi@redhat.com> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: Christoph Lameter <cl@linux.com> Cc: Geoff Levand <geoff@infradead.org> Cc: Gilad Ben Yossef <gilad@benyossef.com> Cc: Hakan Akkan <hakanakkan@gmail.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Josh Triplett <josh@joshtriplett.org> Cc: Kevin Hilman <khilman@ti.com> Cc: Max Krasnyansky <maxk@qualcomm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephen Hemminger <shemminger@vyatta.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Sven-Thorsten Dietrich <thebigcorporation@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/rcutree.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 4138f59fa2f4..79fa2db1595b 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -400,6 +400,7 @@ void rcu_idle_enter(void)
}
EXPORT_SYMBOL_GPL(rcu_idle_enter);
+#ifdef CONFIG_RCU_USER_QS
/**
* rcu_user_enter - inform RCU that we are resuming userspace.
*
@@ -424,7 +425,6 @@ void rcu_user_enter(void)
rcu_eqs_enter(1);
}
-
/**
* rcu_user_enter_after_irq - inform RCU that we are going to resume userspace
* after the current irq returns.
@@ -445,6 +445,7 @@ void rcu_user_enter_after_irq(void)
rdtp->dynticks_nesting = 1;
local_irq_restore(flags);
}
+#endif /* CONFIG_RCU_USER_QS */
/**
* rcu_irq_exit - inform RCU that current CPU is exiting irq towards idle
@@ -548,6 +549,7 @@ void rcu_idle_exit(void)
}
EXPORT_SYMBOL_GPL(rcu_idle_exit);
+#ifdef CONFIG_RCU_USER_QS
/**
* rcu_user_exit - inform RCU that we are exiting userspace.
*
@@ -591,6 +593,7 @@ void rcu_user_exit_after_irq(void)
rdtp->dynticks_nesting += DYNTICK_TASK_EXIT_IDLE;
local_irq_restore(flags);
}
+#endif /* CONFIG_RCU_USER_QS */
/**
* rcu_irq_enter - inform RCU that current CPU is entering irq away from idle