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Document what mmu_notifier_invalidate_range_start_nonblock() is for. Also add a __must_check annotation to signal that callers must bail out if a notifier vetoes the operation. Link: https://lkml.kernel.org/r/20230918201832.265108-1-jannh@google.com Signed-off-by: Jann Horn <jannh@google.com> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Reviewed-by: Alistair Popple <apopple@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>