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| author |   Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | 2021-08-05 09:27:15 -0400 |
|---|---|---|
| committer |   Steven Rostedt (VMware) <rostedt@goodmis.org> | 2021-08-05 15:40:41 -0400 |
| commit | f7ec4121256393e1d03274acdca73eb18958f27e (patch) | |
| tree | b22838fd7ffa466129fa2288ee37c828a10c5210 /kernel | |
| parent | tracing: Quiet smp_processor_id() use in preemptable warning in hwlat (diff) | |
| download | linux-dev-f7ec4121256393e1d03274acdca73eb18958f27e.tar.xz linux-dev-f7ec4121256393e1d03274acdca73eb18958f27e.zip | |
tracepoint: static call: Compare data on transition from 2->1 callees
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: 547305a64632 ("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>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/tracepoint.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c index fc32821f8240..133b6454b287 100644 --- a/kernel/tracepoint.c +++ b/kernel/tracepoint.c @@ -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; |