pagewalk: use lockdep_assert_held for locking validation

Use lockdep to check for held locks instead of using home grown asserts.

Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Christoph Hellwig <[e-mail]>
Reviewed-by: Thomas Hellstrom <[e-mail]>
Reviewed-by: Steven Price <[e-mail]>
Reviewed-by: Jason Gunthorpe <[e-mail]>
Signed-off-by: Jason Gunthorpe <[e-mail]>

mm/pagewalk.c

···
 	if (!walk.mm)
 		return -EINVAL;
 
-	VM_BUG_ON_MM(!rwsem_is_locked(&walk.mm->mmap_sem), walk.mm);
+	lockdep_assert_held(&walk.mm->mmap_sem);
 
 	vma = find_vma(walk.mm, start);
 	do {
···
 	if (!walk.mm)
 		return -EINVAL;
 
-	VM_BUG_ON(!rwsem_is_locked(&vma->vm_mm->mmap_sem));
+	lockdep_assert_held(&walk.mm->mmap_sem);
 
 	err = walk_page_test(vma->vm_start, vma->vm_end, &walk);
 	if (err > 0)