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Commit 0bb7b59d authored by Paul E. McKenney's avatar Paul E. McKenney Committed by Paul E. McKenney
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rcu: Add diagnostic for misaligned rcu_head structures 



The push for energy efficiency will require that RCU tag rcu_head
structures to indicate whether or not their invocation is time critical.
This tagging is best carried out in the bottom bits of the ->next
pointers in the rcu_head structures.  This tagging requires that the
rcu_head structures be properly aligned, so this commit adds the required
diagnostics.

Signed-off-by: default avatarPaul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent fe15d706

kernel/rcutree.c

+1 −0
Original line number Original line Diff line number Diff line
@@ -1707,6 +1707,7 @@ __call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *rcu), 
	unsigned long flags;

	unsigned long flags;

	struct rcu_data *rdp;

	struct rcu_data *rdp;





	WARN_ON_ONCE((unsigned long)head & 0x3); /* Misaligned rcu_head! */

	debug_rcu_head_queue(head);

	debug_rcu_head_queue(head);

	head->func = func;

	head->func = func;

	head->next = NULL;

	head->next = NULL;