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Add a lock contention tracepoint in the queued spinlock slowpath. Also add the __lockfunc annotation so that in_lock_functions() works as expected. Signed-off-by: Nysal Jan K.A. <nysal@linux.ibm.com> Reviewed-by: Shrikanth Hegde <sshegde@linux.ibm.com> Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com> Link: https://patch.msgid.link/20250731061856.1858898-1-nysal@linux.ibm.com