[PATCH v4 1/4] arch: make __mutex_fastpath_lock_retval return whether fastpath succeeded or not.

This will allow me to call functions that have multiple arguments if fastpath fails. This is required to support ticket mutexes, because they need to be able to pass an extra argument to the fail function. Originally I duplicated the functions, by adding __mutex_fastpath_lock_retval_arg. This

[PATCH v4 1/4] arch: make __mutex_fastpath_lock_retval return whether fastpath succeeded or not.

This will allow me to call functions that have multiple arguments if fastpath fails. This is required to support ticket mutexes, because they need to be able to pass an extra argument to the fail function. Originally I duplicated the functions, by adding __mutex_fastpath_lock_retval_arg. This