Commits
Dmitriy Monakhov authored and Pavel Emelianov committed ad146c228a5
[PATCH] BC: aidband - uncharge UB pages before charging to PB By design we assume that page may be accounted only in UB or only in PB counter. Unfortunately this is not always true, and ATI driver does some strange things like mmaping pages with PTEs to user space (maybe it is even a security hole in ATI driver, who knows?) So ATI driver exports pages via mmap(2) to userspace which was already accounted in UB (pte pages are charged to kmemsize). In this case accounting conflict happens and BUG_ON(head->pb_magic != PB_MAGIC) is triggered. Solution: Uncharge page from UB counter and account it in PB. Changes from v1: Add WARN_ON_ONCE according to Pavel's cmomments.