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CONFIG_DEBUG_MUTEXES and CONFIG_PREEMPT_RT are mutually exclusive. They can't be both set at the same time. Move up the mutex_destroy() function declaration and the __DEBUG_MUTEX_INITIALIZER() macro above the "#ifndef CONFIG_PREEMPT_RT" section to eliminate duplicated mutex_destroy() declaration. Also remove the duplicated mutex_trylock() function declaration in the CONFIG_PREEMPT_RT section. Signed-off-by: Waiman Long <longman@redhat.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Reviewed-by: Boqun Feng <boqun.feng@gmail.com> Link: https://lore.kernel.org/r/20240222150540.79981-3-longman@redhat.com