memory-failure: export page_type and action result

memory-failure: export page_type and action result

Export 'outcome' and 'action_page_type' to mm.h, so we could use
this emnus outside.

This patch is preparation for adding trace events for memory-failure
recovery action.

Signed-off-by: Xie XiuQi <[email protected]>
Acked-by: Naoya Horiguchi <[email protected]>
Cc: Chen Gong <[email protected]>
Cc: Jim Davis <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Tony Luck <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>