On 11/19/18 5:46 PM, Michal Hocko wrote: > On Mon 19-11-18 17:36:21, Vlastimil Babka wrote: >> >> So what protects us from locking a page whose refcount dropped to zero? >> and is being freed? The checks in freeing path won't be happy about a >> stray lock. > > Nothing really prevents that. But does it matter. The worst that might > happen is that we lock a freed or reused page. Who would complain? free_pages_check() for example PAGE_FLAGS_CHECK_AT_FREE includes PG_locked
