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| author |   Paul E. McKenney <paul.mckenney@linaro.org> | 2012-01-05 14:44:39 -0800 |
|---|---|---|
| committer |   Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2012-02-21 09:03:24 -0800 |
| commit | 0bb7b59d6e2b8440cd7097097dd4bbfc4d76ed07 (patch) | |
| tree | f0f36a0a5b6ea4ffd1a43e0c7bb5e90803076746 /kernel/rcutree.c | |
| parent | rcu: Add lockdep-RCU checks for simple self-deadlock (diff) | |
| download | linux-dev-0bb7b59d6e2b8440cd7097097dd4bbfc4d76ed07.tar.xz linux-dev-0bb7b59d6e2b8440cd7097097dd4bbfc4d76ed07.zip | |
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: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcutree.c')
| -rw-r--r-- | kernel/rcutree.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/rcutree.c b/kernel/rcutree.c index 3cf713a724c1..570f7530f4b3 100644 --- a/kernel/rcutree.c +++ b/kernel/rcutree.c @@ -1707,6 +1707,7 @@ __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! */ debug_rcu_head_queue(head); head->func = func; head->next = NULL; |