diff options
| author | Paul E. McKenney <paul.mckenney@linaro.org> | 2012-12-29 23:52:41 +0100 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2013-03-26 16:04:52 +0100 |
| commit | b92db6cb7efcbd41e469e1d757c47da4865f7622 (patch) | |
| tree | eb01e59dc149f3c6f0faa581b3cf56a25122c521 /kernel/rcutree.c | |
| parent | rcu: Make RCU_FAST_NO_HZ take advantage of numbered callbacks (diff) | |
| download | linux-b92db6cb7efcbd41e469e1d757c47da4865f7622.tar.xz linux-b92db6cb7efcbd41e469e1d757c47da4865f7622.zip | |
rcu: Rearrange locking in rcu_start_gp()
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 first step in this direction
by moving the release of this lock to the end of rcu_start_gp().
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 | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/kernel/rcutree.c b/kernel/rcutree.c index 7b1d7769872a..2c6a9314c7f7 100644 --- a/kernel/rcutree.c +++ b/kernel/rcutree.c @@ -1521,16 +1521,14 @@ rcu_start_gp(struct rcu_state *rsp, unsigned long flags) raw_spin_unlock_irqrestore(&rnp->lock, flags); return; } - rsp->gp_flags = RCU_GP_FLAG_INIT; - raw_spin_unlock(&rnp->lock); /* Interrupts remain disabled. */ /* Ensure that CPU is aware of completion of last grace period. */ - rcu_process_gp_end(rsp, rdp); - local_irq_restore(flags); + __rcu_process_gp_end(rsp, rdp->mynode, rdp); /* Wake up rcu_gp_kthread() to start the grace period. */ wake_up(&rsp->gp_wq); + raw_spin_unlock_irqrestore(&rnp->lock, flags); } /* |