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Subject[PATCH] rcu: change function declaration to bool
rcu_cpu_has_callbacks() is declared int but is actually returning bool and
all call-sites currently use it as bool so the declaration should be bool
as well.

Signed-off-by: Nicholas Mc Guire <>

./kernel/rcu/tree.c:3538 WARNING: return of wrong type
int != bool,

as the description of rcu_cpu_has_callbacks() states:
" * Return true if the specified CPU has any callback...."
this probably should be a bool
All (3) call sites are conditions and are treating it as boolean.

Patch was compile tested with x86_64_defconfig (implies CONFIG_TREE_RCU=y)

Patch is against 4.1-rc3 (localversion-next is -next-20150511)

kernel/rcu/tree.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index bcc5943..599550c 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3516,7 +3516,7 @@ static int rcu_pending(void)
* non-NULL, store an indication of whether all callbacks are lazy.
* (If there are no callbacks, all of them are deemed to be lazy.)
-static int __maybe_unused rcu_cpu_has_callbacks(bool *all_lazy)
+static bool __maybe_unused rcu_cpu_has_callbacks(bool *all_lazy)
bool al = true;
bool hc = false;

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