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authorDavid S. Miller <davem@davemloft.net>2006-03-31 00:36:25 -0800
committerDavid S. Miller <davem@sunset.davemloft.net>2006-03-31 23:03:36 -0800
commit9df1dab1df58ef20ef7df9b8f39d86cf5d2d1949 (patch)
tree7f697e5cc595c906b4779f8301ef3eb58cfea728 /arch/sparc64
parent73c50a27a453a5ed0d21ff23bd67c1dd6d864cb8 (diff)
downloadop-kernel-dev-9df1dab1df58ef20ef7df9b8f39d86cf5d2d1949.zip
op-kernel-dev-9df1dab1df58ef20ef7df9b8f39d86cf5d2d1949.tar.gz
[SPARC64]: Align address in huge_pte_alloc().
We are about to fill in all HPAGE_SIZE's worth of PAGE_SIZE ptes, so we have to give the first pte in that set else we scribble over random memory when we fill in the ptes. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc64')
-rw-r--r--arch/sparc64/mm/hugetlbpage.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/sparc64/mm/hugetlbpage.c b/arch/sparc64/mm/hugetlbpage.c
index 074620d..fbbbebb 100644
--- a/arch/sparc64/mm/hugetlbpage.c
+++ b/arch/sparc64/mm/hugetlbpage.c
@@ -198,6 +198,13 @@ 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) {
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