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authorMathieu Desnoyers <mathieu.desnoyers@polymtl.ca>2008-09-30 01:51:12 -0400
committerIngo Molnar <mingo@elte.hu>2008-10-14 10:38:23 +0200
commit9a1e9693f534174945154197fec4ec92f168ce21 (patch)
treed1477dc3492812c2f8a93afe37075857d4b1ce0f /kernel
parentca2db6cf30d6a45798b7a760d0c4f7735b16799d (diff)
downloadblackbird-op-linux-9a1e9693f534174945154197fec4ec92f168ce21.tar.gz
blackbird-op-linux-9a1e9693f534174945154197fec4ec92f168ce21.zip
tracepoints: fix reentrancy
The tracepoints had the same problem markers did have wrt reentrancy. Apply a similar fix using a rcu_barrier after each tracepoint mutex lock. Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/tracepoint.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c
index db39961a0d03..f2b7c28a4708 100644
--- a/kernel/tracepoint.c
+++ b/kernel/tracepoint.c
@@ -356,6 +356,8 @@ int tracepoint_probe_register(const char *name, void *probe)
mutex_lock(&tracepoints_mutex);
entry = get_tracepoint(name);
WARN_ON(!entry);
+ if (entry->rcu_pending)
+ rcu_barrier_sched();
tracepoint_entry_free_old(entry, old);
end:
mutex_unlock(&tracepoints_mutex);
@@ -392,6 +394,8 @@ int tracepoint_probe_unregister(const char *name, void *probe)
entry = get_tracepoint(name);
if (!entry)
goto end;
+ if (entry->rcu_pending)
+ rcu_barrier_sched();
tracepoint_entry_free_old(entry, old);
remove_tracepoint(name); /* Ignore busy error message */
ret = 0;
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