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Even with KCSAN_REPORT_VALUE_CHANGE_ONLY, KCSAN still reports data races between reads and watchpointed writes, even if the writes wrote values already present. This commit causes KCSAN to unconditionally skip reporting in this case. Signed-off-by: Marco Elver <elver@google.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org>