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SubjectRe: [PATCH 1/3] mm, numa: rework do_pages_move
On Mon, 29 Jan 2018 17:06:14 -0500 "Zi Yan" <zi.yan@cs.rutgers.edu> wrote:

> I discover that this patch does not hold mmap_sem while migrating pages in
> do_move_pages_to_node().
>
> A simple fix below moves mmap_sem from add_page_for_migration()
> to the outmost do_pages_move():

I'm not surprised. Why does do_move_pages_to_node() need mmap_sem
and how is a reader to discover that fact???

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