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authorPaul E. McKenney <paul.mckenney@linaro.org>2012-12-29 22:04:18 -0800
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2013-03-26 08:04:55 -0700
commitb8462084a2a88a6a0489f9bb7d8b1bb95bc455ab (patch)
treec784b3be6b83d2f55cac528c6c877504c27078df /kernel/rcutree_plugin.h
parentbd9f0686fc8c9a01c6850b1c611d1c9ad80b86d6 (diff)
downloadop-kernel-dev-b8462084a2a88a6a0489f9bb7d8b1bb95bc455ab.zip
op-kernel-dev-b8462084a2a88a6a0489f9bb7d8b1bb95bc455ab.tar.gz
rcu: Push lock release to rcu_start_gp()'s callers
If CPUs are to give prior notice of needed grace periods, it will be necessary to invoke rcu_start_gp() without dropping the root rcu_node structure's ->lock. This commit takes a second step in this direction by moving the release of this lock to rcu_start_gp()'s callers. 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_plugin.h')
-rw-r--r--kernel/rcutree_plugin.h5
1 files changed, 2 insertions, 3 deletions
diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h
index df50502..073ded2 100644
--- a/kernel/rcutree_plugin.h
+++ b/kernel/rcutree_plugin.h
@@ -2174,7 +2174,6 @@ static void rcu_nocb_wait_gp(struct rcu_data *rdp)
unsigned long c;
bool d;
unsigned long flags;
- unsigned long flags1;
struct rcu_node *rnp = rdp->mynode;
struct rcu_node *rnp_root = rcu_get_root(rdp->rsp);
@@ -2236,8 +2235,8 @@ static void rcu_nocb_wait_gp(struct rcu_data *rdp)
c, rnp->level,
rnp->grplo, rnp->grphi,
"Startedroot");
- local_save_flags(flags1);
- rcu_start_gp(rdp->rsp, flags1); /* Rlses ->lock. */
+ rcu_start_gp(rdp->rsp);
+ raw_spin_unlock(&rnp->lock);
}
/* Clean up locking and irq state. */
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