On Tue, Sep 19, 2023 at 10:16:09PM -0400, riel@xxxxxxxxxxx wrote: > From: Rik van Riel <riel@xxxxxxxxxxx> > > Extend the locking scheme used to protect shared hugetlb mappings > from truncate vs page fault races, in order to protect private > hugetlb mappings (with resv_map) against MADV_DONTNEED. > > Add a read-write semaphore to the resv_map data structure, and > use that from the hugetlb_vma_(un)lock_* functions, in preparation > for closing the race between MADV_DONTNEED and page faults. This feels an awful lot like the invalidate_lock in struct address_space which was recently added by Jan Kara.
