Re: [PATCH 2/3] mm/hugetlb: take refcount under page table lock in follow_huge_pmd()

On Mon, 28 Jul 2014, Naoya Horiguchi wrote:

We have a race condition between move_pages() and freeing hugepages,
where move_pages() calls follow_page(FOLL_GET) for hugepages internally
and tries to get its refcount without preventing concurrent freeing.
This race crashes the kernel, so this patch fixes it by moving FOLL_GET
code for hugepages into follow_huge_pmd() with taking the page table lock.

What about CONFIG_ARCH_WANT_GENERAL_HUGETLB=n configs?

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