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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2013-03-19 14:10:43 -0400
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2013-06-10 16:39:42 -0400
commitd34ea3221a0f34ed42eadabf054604bbcc7ecd27 (patch)
tree8a638346b2da58558abccf92f394372d098c4910
parent398ebe6000c16135d12ce2ff64318f306ffb20b0 (diff)
rcu: Rename note_new_gpnum() to note_gp_changes()
Because note_new_gpnum() now also checks for the ends of old grace periods, this commit changes its name to note_gp_changes(). Later commits will merge rcu_process_gp_end() into note_gp_changes(). Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
-rw-r--r--kernel/rcutree.c13
1 files changed, 7 insertions, 6 deletions
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 54aba759b609..7eb2bc95300a 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -1307,7 +1307,7 @@ __rcu_process_gp_end(struct rcu_state *rsp, struct rcu_node *rnp, struct rcu_dat
1307 * ->lock of the leaf rcu_node structure corresponding to the current CPU, 1307 * ->lock of the leaf rcu_node structure corresponding to the current CPU,
1308 * and must have irqs disabled. 1308 * and must have irqs disabled.
1309 */ 1309 */
1310static void __note_new_gpnum(struct rcu_state *rsp, struct rcu_node *rnp, struct rcu_data *rdp) 1310static void __note_gp_changes(struct rcu_state *rsp, struct rcu_node *rnp, struct rcu_data *rdp)
1311{ 1311{
1312 /* Handle the ends of any preceding grace periods first. */ 1312 /* Handle the ends of any preceding grace periods first. */
1313 __rcu_process_gp_end(rsp, rnp, rdp); 1313 __rcu_process_gp_end(rsp, rnp, rdp);
@@ -1326,19 +1326,20 @@ static void __note_new_gpnum(struct rcu_state *rsp, struct rcu_node *rnp, struct
1326 } 1326 }
1327} 1327}
1328 1328
1329static void note_new_gpnum(struct rcu_state *rsp, struct rcu_data *rdp) 1329static void note_gp_changes(struct rcu_state *rsp, struct rcu_data *rdp)
1330{ 1330{
1331 unsigned long flags; 1331 unsigned long flags;
1332 struct rcu_node *rnp; 1332 struct rcu_node *rnp;
1333 1333
1334 local_irq_save(flags); 1334 local_irq_save(flags);
1335 rnp = rdp->mynode; 1335 rnp = rdp->mynode;
1336 if (rdp->gpnum == ACCESS_ONCE(rnp->gpnum) || /* outside lock. */ 1336 if ((rdp->gpnum == ACCESS_ONCE(rnp->gpnum) &&
1337 rdp->completed == ACCESS_ONCE(rnp->completed)) || /* w/out lock. */
1337 !raw_spin_trylock(&rnp->lock)) { /* irqs already off, so later. */ 1338 !raw_spin_trylock(&rnp->lock)) { /* irqs already off, so later. */
1338 local_irq_restore(flags); 1339 local_irq_restore(flags);
1339 return; 1340 return;
1340 } 1341 }
1341 __note_new_gpnum(rsp, rnp, rdp); 1342 __note_gp_changes(rsp, rnp, rdp);
1342 raw_spin_unlock_irqrestore(&rnp->lock, flags); 1343 raw_spin_unlock_irqrestore(&rnp->lock, flags);
1343} 1344}
1344 1345
@@ -1377,7 +1378,7 @@ check_for_new_grace_period(struct rcu_state *rsp, struct rcu_data *rdp)
1377 1378
1378 local_irq_save(flags); 1379 local_irq_save(flags);
1379 if (rdp->gpnum != rsp->gpnum) { 1380 if (rdp->gpnum != rsp->gpnum) {
1380 note_new_gpnum(rsp, rdp); 1381 note_gp_changes(rsp, rdp);
1381 ret = 1; 1382 ret = 1;
1382 } 1383 }
1383 local_irq_restore(flags); 1384 local_irq_restore(flags);
@@ -1396,7 +1397,7 @@ rcu_start_gp_per_cpu(struct rcu_state *rsp, struct rcu_node *rnp, struct rcu_dat
1396 __rcu_process_gp_end(rsp, rnp, rdp); 1397 __rcu_process_gp_end(rsp, rnp, rdp);
1397 1398
1398 /* Set state so that this CPU will detect the next quiescent state. */ 1399 /* Set state so that this CPU will detect the next quiescent state. */
1399 __note_new_gpnum(rsp, rnp, rdp); 1400 __note_gp_changes(rsp, rnp, rdp);
1400} 1401}
1401 1402
1402/* 1403/*