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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-06-09 17:24:17 +0200 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-07-09 18:14:50 +0200 |
| commit | 1146edcbef3789228454c4aa42c08ddc2c275990 (patch) | |
| tree | 3037da619c07da2510adc21decf09fdd0b2ad34d | |
| parent | rcu: Eliminate read-modify-write ACCESS_ONCE() calls (diff) | |
| download | linux-1146edcbef3789228454c4aa42c08ddc2c275990.tar.xz linux-1146edcbef3789228454c4aa42c08ddc2c275990.zip | |
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 <gerg@uclinux.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Lai Jiangshan <laijs@cn.fujitsu.com>
| -rw-r--r-- | kernel/rcu/tree.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 6bf7daebcc6b..bcd635e42841 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -2662,7 +2662,7 @@ __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; |