[PATCH] shared page table for hugetlb page

[deliverable/linux.git] / arch / sparc64 / mm / hugetlbpage.c

diff --git a/arch/sparc64/mm/hugetlbpage.c b/arch/sparc64/mm/hugetlbpage.c
index 074620d413d4733db87aca5f0ce6f09be09a080e..33fd0b265e707afdee93ec63322e9bff01220882 100644 (file)
--- a/arch/sparc64/mm/hugetlbpage.c
+++ b/arch/sparc64/mm/hugetlbpage.c
@@ -4,7 +4,6 @@
  * Copyright (C) 2002, 2003, 2006 David S. Miller (davem@davemloft.net)
  */
 
-#include <linux/config.h>
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/fs.h>
@@ -198,6 +197,13 @@ pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr)
        pmd_t *pmd;
        pte_t *pte = NULL;
 
+       /* We must align the address, because our caller will run
+        * set_huge_pte_at() on whatever we return, which writes out
+        * all of the sub-ptes for the hugepage range.  So we have
+        * to give it the first such sub-pte.
+        */
+       addr &= HPAGE_MASK;
+
        pgd = pgd_offset(mm, addr);
        pud = pud_alloc(mm, pgd, addr);
        if (pud) {
@@ -229,6 +235,11 @@ pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
        return pte;
 }
 
+int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)
+{
+       return 0;
+}
+
 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
                     pte_t *ptep, pte_t entry)
 {