[PATCH] ppc64: Fix bug in SLB miss handler for hugepages

[pandora-kernel.git] / arch / powerpc / mm / hugetlbpage.c

diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
index 0073a04..426c269 100644 (file)
--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -212,6 +212,12 @@ static int prepare_high_area_for_htlb(struct mm_struct *mm, unsigned long area)
 
        BUG_ON(area >= NUM_HIGH_AREAS);
 
+       /* Hack, so that each addresses is controlled by exactly one
+        * of the high or low area bitmaps, the first high area starts
+        * at 4GB, not 0 */
+       if (start == 0)
+               start = 0x100000000UL;
+
        /* Check no VMAs are in the region */
        vma = find_vma(mm, start);
        if (vma && (vma->vm_start < end))