From: Paul E. McKenney Date: Mon, 9 Jun 2014 15:24:17 +0000 (-0700) Subject: rcu: Loosen __call_rcu()'s rcu_head alignment constraint X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=3863144ef20769eeab58d56ada63588a854f4a59;p=karo-tx-linux.git rcu: Loosen __call_rcu()'s rcu_head alignment constraint The m68k architecture aligns only to 16-bit boundaries, which can cause the align-to-32-bits check in __call_rcu() to trigger. Because there is currently no known potential need for more than one low-order bit, this commit loosens the check to 16-bit boundaries. Reported-by: Greg Ungerer Signed-off-by: Paul E. McKenney --- diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index c5f8284169a8..4feeec6cb9c8 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -2671,7 +2671,7 @@ __call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *rcu), unsigned long flags; struct rcu_data *rdp; - WARN_ON_ONCE((unsigned long)head & 0x3); /* Misaligned rcu_head! */ + WARN_ON_ONCE((unsigned long)head & 0x1); /* Misaligned rcu_head! */ if (debug_rcu_head_queue(head)) { /* Probable double call_rcu(), so leak the callback. */ ACCESS_ONCE(head->func) = rcu_leak_callback;