From: Davidlohr Bueso <d...@stgolabs.net> When handling a page fault, it happens that the mmap_sem is released during the processing. As moving to range lock requires to pass the range parameter to the lock/unlock operation, this patch add a pointer to the range structure used when locking the mmap_sem to vm_fault structure.
It is currently unused, but will be in the next patches. Signed-off-by: Davidlohr Bueso <dbu...@suse.de> --- include/linux/mm.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index 9d2ed23aa894..bcf2509d448d 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -361,6 +361,10 @@ struct vm_fault { * page table to avoid allocation from * atomic context. */ + struct range_lock *lockrange; /* Range lock interval in use for when + * the mm lock is manipulated throughout + * its lifespan. + */ }; /* page entry size for vm->huge_fault() */ -- 2.13.6