[PATCH] maple_tree: Add dead node check in mas_dup_alloc()

[Matthew Wilcox]

On Tue, Jan 06, 2026 at 11:01:27AM -0500, Liam R. Howlett wrote:
> The fact that no one in the tree uses it incorrectly means that any
> backport would be for the benefit of out-of-tree drivers, which we do
> not support.

Should this interface be EXPORT_SYMBOL_GPL to make that clear?