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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2012-09-20 16:02:49 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2012-10-20 13:47:10 -0700
commit62da1921292ef789c23a7bf01d671d7572baf377 (patch)
treeaec958e9dbfe4d7fbdfe13e8a622721bc87a1313 /net/netrom
parent6f0c0580b70c89094b3422ba81118c7b959c7556 (diff)
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op-kernel-dev-62da1921292ef789c23a7bf01d671d7572baf377.tar.gz
rcu: Accelerate callbacks for CPU initiating a grace period
Because grace-period initialization is carried out by a separate kthread, it might happen on a different CPU than the one that had the callback needing a grace period -- which is where the callback acceleration needs to happen. Fortunately, rcu_start_gp() holds the root rcu_node structure's ->lock, which prevents a new grace period from starting. This allows this function to safely determine that a grace period has not yet started, which in turn allows it to fully accelerate any callbacks that it has pending. This commit adds this acceleration. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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