On Tue, Sep 29, 2020 at 06:19:59PM -0700, Jann Horn wrote: > To be safe against concurrent changes to the VMA tree, we must take the > mmap lock around GUP operations (excluding the GUP-fast family of > operations, which will take the mmap lock by themselves if necessary). > > This code is only for testing, and it's only reachable by root through > debugfs, so this doesn't really have any impact; however, if we want to add > lockdep asserts into the GUP path, we need to have clean locking here. > > Signed-off-by: Jann Horn <jannh@xxxxxxxxxx> > --- Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx> Jason
