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| author | Lihao Liang <lianglihao@huawei.com> | 2017-11-22 19:00:55 +0000 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2018-02-15 15:40:36 -0800 |
| commit | 398953e62ce3b27f9f7805e367195b7ee6705f57 (patch) | |
| tree | ee2ba5620f0cacba106a98c93375830bc2fe99be | |
| parent | 7928b2cbe55b2a410a0f5c1f154610059c57b1b2 (diff) | |
| download | linux-398953e62ce3b27f9f7805e367195b7ee6705f57.tar.gz linux-398953e62ce3b27f9f7805e367195b7ee6705f57.tar.bz2 linux-398953e62ce3b27f9f7805e367195b7ee6705f57.zip | |
rcu: Remove unnecessary spinlock in rcu_boot_init_percpu_data()
Since rcu_boot_init_percpu_data() is only called at boot time,
there is no data race and spinlock is not needed.
Signed-off-by: Lihao Liang <lianglihao@huawei.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
| -rw-r--r-- | kernel/rcu/tree.c | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 491bdf39f276..66c73a214cff 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -3636,12 +3636,9 @@ static void rcu_init_new_rnp(struct rcu_node *rnp_leaf) static void __init rcu_boot_init_percpu_data(int cpu, struct rcu_state *rsp) { - unsigned long flags; struct rcu_data *rdp = per_cpu_ptr(rsp->rda, cpu); - struct rcu_node *rnp = rcu_get_root(rsp); /* Set up local state, ensuring consistent view of global state. */ - raw_spin_lock_irqsave_rcu_node(rnp, flags); rdp->grpmask = leaf_node_cpu_bit(rdp->mynode, cpu); rdp->dynticks = &per_cpu(rcu_dynticks, cpu); WARN_ON_ONCE(rdp->dynticks->dynticks_nesting != 1); @@ -3649,7 +3646,6 @@ rcu_boot_init_percpu_data(int cpu, struct rcu_state *rsp) rdp->cpu = cpu; rdp->rsp = rsp; rcu_boot_init_nocb_percpu_data(rdp); - raw_spin_unlock_irqrestore_rcu_node(rnp, flags); } /* |