Re: [PATCH 1/2] thp: Add compound tail page _mapcount when mapped

[Andi Kleen]

> > +++ 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@xxxxxxxxxxxxxxx -- Speaking for myself only.
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