The patch titled
markers: use rcu_barrier_sched() and call_rcu_sched()
has been added to the -mm tree. Its filename is
markers-use-rcu_barrier_sched-and-call_rcu_sched.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: markers: use rcu_barrier_sched() and call_rcu_sched()
From: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxx>
rcu_barrier_sched() and call_rcu_sched() were introduced in 2.6.26 for the
Markers. Change the marker code to use them.
It can be seen as a fix since the marker code was using an ugly,
temporary, #ifdef hack to work around CONFIG_PREEMPT_RCU.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxx>
Acked-by: Paul McKenney <paulmck@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/marker.c | 25 ++++++++-----------------
1 file changed, 8 insertions(+), 17 deletions(-)
diff -puN kernel/marker.c~markers-use-rcu_barrier_sched-and-call_rcu_sched kernel/marker.c
--- a/kernel/marker.c~markers-use-rcu_barrier_sched-and-call_rcu_sched
+++ a/kernel/marker.c
@@ -441,7 +441,7 @@ static int remove_marker(const char *nam
hlist_del(&e->hlist);
/* Make sure the call_rcu has been executed */
if (e->rcu_pending)
- rcu_barrier();
+ rcu_barrier_sched();
kfree(e);
return 0;
}
@@ -476,7 +476,7 @@ static int marker_set_format(struct mark
hlist_del(&(*entry)->hlist);
/* Make sure the call_rcu has been executed */
if ((*entry)->rcu_pending)
- rcu_barrier();
+ rcu_barrier_sched();
kfree(*entry);
*entry = e;
trace_mark(core_marker_format, "name %s format %s",
@@ -655,7 +655,7 @@ int marker_probe_register(const char *na
* make sure it's executed now.
*/
if (entry->rcu_pending)
- rcu_barrier();
+ rcu_barrier_sched();
old = marker_entry_add_probe(entry, probe, probe_private);
if (IS_ERR(old)) {
ret = PTR_ERR(old);
@@ -670,10 +670,7 @@ int marker_probe_register(const char *na
entry->rcu_pending = 1;
/* write rcu_pending before calling the RCU callback */
smp_wmb();
-#ifdef CONFIG_PREEMPT_RCU
- synchronize_sched(); /* Until we have the call_rcu_sched() */
-#endif
- call_rcu(&entry->rcu, free_old_closure);
+ call_rcu_sched(&entry->rcu, free_old_closure);
end:
mutex_unlock(&markers_mutex);
return ret;
@@ -704,7 +701,7 @@ int marker_probe_unregister(const char *
if (!entry)
goto end;
if (entry->rcu_pending)
- rcu_barrier();
+ rcu_barrier_sched();
old = marker_entry_remove_probe(entry, probe, probe_private);
mutex_unlock(&markers_mutex);
marker_update_probes(); /* may update entry */
@@ -716,10 +713,7 @@ int marker_probe_unregister(const char *
entry->rcu_pending = 1;
/* write rcu_pending before calling the RCU callback */
smp_wmb();
-#ifdef CONFIG_PREEMPT_RCU
- synchronize_sched(); /* Until we have the call_rcu_sched() */
-#endif
- call_rcu(&entry->rcu, free_old_closure);
+ call_rcu_sched(&entry->rcu, free_old_closure);
remove_marker(name); /* Ignore busy error message */
ret = 0;
end:
@@ -786,7 +780,7 @@ int marker_probe_unregister_private_data
goto end;
}
if (entry->rcu_pending)
- rcu_barrier();
+ rcu_barrier_sched();
old = marker_entry_remove_probe(entry, NULL, probe_private);
mutex_unlock(&markers_mutex);
marker_update_probes(); /* may update entry */
@@ -797,10 +791,7 @@ int marker_probe_unregister_private_data
entry->rcu_pending = 1;
/* write rcu_pending before calling the RCU callback */
smp_wmb();
-#ifdef CONFIG_PREEMPT_RCU
- synchronize_sched(); /* Until we have the call_rcu_sched() */
-#endif
- call_rcu(&entry->rcu, free_old_closure);
+ call_rcu_sched(&entry->rcu, free_old_closure);
remove_marker(entry->name); /* Ignore busy error message */
end:
mutex_unlock(&markers_mutex);
_
Patches currently in -mm which might be from mathieu.desnoyers@xxxxxxxxxx are
origin.patch
markers-fix-duplicate-modpost-entry.patch
linux-next.patch
markers-use-rcu_barrier_sched-and-call_rcu_sched.patch
markers-fix-sparse-integer-as-null-pointer-warning.patch
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