linux-kernel - [PATCH] [15/18] Add support to x86-64 to allocate and lookup GB pages in hugetlb

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Message-Id: <20080317015829.1FA4F1B41E0@basil.firstfloor.org>
Date:	Mon, 17 Mar 2008 02:58:29 +0100 (CET)
From:	Andi Kleen <andi@...stfloor.org>
To:	linux-kernel@...r.kernel.org, pj@....com, linux-mm@...ck.org,
	nickpiggin@...oo.com.au
Subject: [PATCH] [15/18] Add support to x86-64 to allocate and lookup GB pages in hugetlb


Signed-off-by: Andi Kleen <ak@...e.de>

---
 arch/x86/mm/hugetlbpage.c |   16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

Index: linux/arch/x86/mm/hugetlbpage.c
===================================================================
--- linux.orig/arch/x86/mm/hugetlbpage.c
+++ linux/arch/x86/mm/hugetlbpage.c
@@ -133,9 +133,14 @@ pte_t *huge_pte_alloc(struct mm_struct *
 	pgd = pgd_offset(mm, addr);
 	pud = pud_alloc(mm, pgd, addr);
 	if (pud) {
-		if (pud_none(*pud))
-			huge_pmd_share(mm, addr, pud);
-		pte = (pte_t *) pmd_alloc(mm, pud, addr);
+		if (sz == PUD_SIZE) {
+			pte = (pte_t *)pud;
+		} else {
+			BUG_ON(sz != PMD_SIZE);
+			if (pud_none(*pud))
+				huge_pmd_share(mm, addr, pud);
+			pte = (pte_t *) pmd_alloc(mm, pud, addr);
+		}
 	}
 	BUG_ON(pte && !pte_none(*pte) && !pte_huge(*pte));
 
@@ -151,8 +156,11 @@ pte_t *huge_pte_offset(struct mm_struct 
 	pgd = pgd_offset(mm, addr);
 	if (pgd_present(*pgd)) {
 		pud = pud_offset(pgd, addr);
-		if (pud_present(*pud))
+		if (pud_present(*pud)) {
+			if (pud_large(*pud))
+				return (pte_t *)pud;
 			pmd = pmd_offset(pud, addr);
+		}
 	}
 	return (pte_t *) pmd;
 }
--
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