mmu_notifiers: fixup comment in mmu_interval_read_begin()

The comment in mmu_interval_read_begin() refers to a function that doesn't
exist and uses the wrong call-back name.  The op for mmu interval
notifiers is mmu_interval_notifier_ops->invalidate() so fix the comment up
to reflect that.

Link: https://lkml.kernel.org/r/e7a09081b3ac82a03c189409f1262fc2df91071e.1690292440.git-series.apopple@nvidia.comSigned-off-by: Alistair Popple <apopple@nvidia.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Cc: Andrew Donnellan <ajd@linux.ibm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Cc: Frederic Barrat <fbarrat@linux.ibm.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Kevin Tian <kevin.tian@intel.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Nicolin Chen <nicolinc@nvidia.com>
Cc: Robin Murphy <robin.murphy@arm.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: SeongJae Park <sj@kernel.org>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: Will Deacon <will@kernel.org>
Cc: Zhi Wang <zhi.wang.linux@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/mmu_notifier.c

@@ -199,7 +199,7 @@ mmu_interval_read_begin(struct mmu_interval_notifier *interval_sub)
 	 * invalidate_start/end and is colliding.
 	 *
 	 * The locking looks broadly like this:
-	 *   mn_tree_invalidate_start():          mmu_interval_read_begin():
+	 *   mn_itree_inv_start():                 mmu_interval_read_begin():
 	 *                                         spin_lock
 	 *                                          seq = READ_ONCE(interval_sub->invalidate_seq);
 	 *                                          seq == subs->invalidate_seq
@@ -207,7 +207,7 @@ mmu_interval_read_begin(struct mmu_interval_notifier *interval_sub)
 	 *    spin_lock
 	 *     seq = ++subscriptions->invalidate_seq
 	 *    spin_unlock
-	 *     op->invalidate_range():
+	 *     op->invalidate():
 	 *       user_lock
 	 *        mmu_interval_set_seq()
 	 *         interval_sub->invalidate_seq = seq