[tip:core/rcu] srcu: Make SRCU be built by default

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Commit-ID:  d160a727c40e7175aa642137910a3fda46262fc8
Gitweb:     http://git.kernel.org/tip/d160a727c40e7175aa642137910a3fda46262fc8
Author:     Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
AuthorDate: Sun, 23 Apr 2017 12:50:59 -0700
Committer:  Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
CommitDate: Mon, 24 Apr 2017 08:36:02 -0700

srcu: Make SRCU be built by default

SRCU is optional, and included only if there is a "select SRCU" in effect.
However, we now have Tiny SRCU, so this commit defaults CONFIG_SRCU=y.

Reported-by: kbuild test robot <fengguang.wu@xxxxxxxxx>
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
---
 init/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/init/Kconfig b/init/Kconfig
index fe72c12..42a346b 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -521,6 +521,7 @@ config RCU_EXPERT
 
 config SRCU
 	bool
+	default y
 	help
 	  This option selects the sleepable version of RCU. This version
 	  permits arbitrary sleeping or blocking within RCU read-side critical
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