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    SubjectRe: [PATCH 1/2] thp: Add compound tail page _mapcount when mapped
    > > +++ b/arch/x86/mm/gup.c
    > > @@ -201,6 +201,8 @@ static noinline int gup_huge_pud(pud_t pud, unsigned long addr,
    > > do {
    > > VM_BUG_ON(compound_head(page) != head);
    > > pages[*nr] = page;
    > > + if (PageTail(page))
    > > + get_huge_page_tail(page);
    > > (*nr)++;
    > > page++;
    > > refs++;
    >
    > Is the patch also applicable to 3.1.x?

    I suspect it's broken since many kernels back, at least since THP
    was introduced, maybe earlier.

    -Andi
    --
    ak@linux.intel.com -- Speaking for myself only.


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