linux-kernel - Re: Transparent Hugepage Support #30

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Message-ID: <20101004032451.GA11622@spritzera.linux.bs1.fc.nec.co.jp>
Date:	Mon, 4 Oct 2010 12:24:51 +0900
From:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>,
	Izik Eidus <ieidus@...hat.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Nick Piggin <npiggin@...e.de>, Rik van Riel <riel@...hat.com>,
	Mel Gorman <mel@....ul.ie>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ingo Molnar <mingo@...e.hu>, Mike Travis <travis@....com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Chris Wright <chrisw@...s-sol.org>, bpicco@...hat.com,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Chris Mason <chris.mason@...cle.com>,
	Borislav Petkov <bp@...en8.de>
Subject: Re: Transparent Hugepage Support #30

Hi,

I experienced build error of "calling pte_alloc_map() with 3 parameters, 
while it's defined to have 4 parameters" in arch/x86/kernel/tboot.c etc.
Is the following chunk in patch "pte alloc trans splitting" necessary?

@@ -1167,16 +1168,18 @@ static inline void pgtable_page_dtor(struct page *page)
        pte_unmap(pte);                                 \
 } while (0)
 
-#define pte_alloc_map(mm, pmd, address)                        \
-       ((unlikely(!pmd_present(*(pmd))) && __pte_alloc(mm, pmd, address))? \
-               NULL: pte_offset_map(pmd, address))
+#define pte_alloc_map(mm, vma, pmd, address)                           \
+       ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, vma,    \
+                                                       pmd, address))? \
+        NULL: pte_offset_map(pmd, address))
 
Thanks,
Naoya Horiguchi
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