Re: [PATCH v2] mm, thp: use head page in __migration_entry_wait

[Matthew Wilcox]

On Tue, Jun 08, 2021 at 03:00:26PM +0300, Kirill A. Shutemov wrote:
> But there's one quirk: if split succeed we effectively wait on wrong
> page to be unlocked. And it may take indefinite time if split_huge_page()
> was called on the head page.

Hardly indefinite time ... callers of split_huge_page_to_list() usually
unlock the page soon after.  Actually, I can't find one that doesn't call
unlock_page() within a few lines of calling split_huge_page_to_list().