Re: [PATCH v9 08/10] mm: Introduce mf_dax_kill_procs() for fsdax case

Please only build the new DAX code if CONFIG_FS_DAX is set.

[PATCH v9 08/10] mm: Introduce mf_dax_kill_procs() for fsdax case

This function is called at the end of RMAP routine, i.e. filesystem recovery function, to collect and kill processes using a shared page of DAX file. The difference with mf_generic_kill_procs() is, it accepts file's (mapping,offset) instead of struct page because different files' mappings and offs