[PATCH] Bad page state mapcount

A small change to the tests for "Bad page state", to avoid one class of the page_remove_rmap BUG reports, giving more information while letting the system continue: check page_mapcount (_mapcount != -1) rather than page_mapped (_mapcount >= 0). And how does _mapcount go bad? In the case under

[PATCH] Bad page state mapcount

A small change to the tests for Bad page state, to avoid one class of the page_remove_rmap BUG reports, giving more information while letting the system continue: check page_mapcount (_mapcount != -1) rather than page_mapped (_mapcount = 0). And how does _mapcount go bad? In the case under