linux-kernel - Re: [PATCH 1/2] thp: Add compound tail page

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Date:	Tue, 29 Nov 2011 01:19:27 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Youquan Song <youquan.song@...el.com>,
	linux-kernel@...r.kernel.org, aarcange@...hat.com,
	wli@...omorphy.com, david.woodhouse@...el.com,
	allen.m.kay@...el.com, mtosatti@...hat.com, chrisw@...hat.com,
	andi@...stfloor.org, chaohong.guo@...el.com,
	Youquan Song <youquan.song@...ux.intel.com>
Subject: Re: [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@...ux.intel.com -- Speaking for myself only.
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