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tracepoint: static call: Compare data on transition from 2->1 callees

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On transition from 2->1 callees, we should be comparing .data rather
than .func, because the same callback can be registered twice with
different data, and what we care about here is that the data of array
element 0 is unchanged to skip rcu sync.

Link: https://lkml.kernel.org/r/20210805132717.23813-2-mathieu.desnoyers@efficios.com
Link: https://lore.kernel.org/io-uring/4ebea8f0-58c9-e571-fd30-0ce4f6f09c70@samba.org/

Cc: stable@vger.kernel.org
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: Stefan Metzmacher <metze@samba.org>
Fixes: 547305a646 ("tracepoint: Fix out of sync data passing by static caller")
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Mathieu Desnoyers 2021-08-05 09:27:15 -04:00 committed by Steven Rostedt (VMware)
parent 51397dc6f2
commit f7ec412125
1 changed files with 1 additions and 1 deletions
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2
kernel/tracepoint.c
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@ -338,7 +338,7 @@ static int tracepoint_remove_func(struct tracepoint *tp,
} else {
rcu_assign_pointer(tp->funcs, tp_funcs);
tracepoint_update_call(tp, tp_funcs,
tp_funcs[0].func != old[0].func);
tp_funcs[0].data != old[0].data);
}
release_probes(old);
return 0;