[PATCH 6/14] get_unmapped_area handles MAP_FIXED on ia64

[Benjamin Herrenschmidt]

Signed-off-by: Benjamin Herrenschmidt <[EMAIL PROTECTED]>
---

 arch/ia64/kernel/sys_ia64.c |    7 +++++++
 arch/ia64/mm/hugetlbpage.c  |    8 ++++++++
 2 files changed, 15 insertions(+)

Index: linux-cell/arch/ia64/kernel/sys_ia64.c
===================================================================
--- linux-cell.orig/arch/ia64/kernel/sys_ia64.c 2007-03-22 15:10:45.000000000 
+1100
+++ linux-cell/arch/ia64/kernel/sys_ia64.c      2007-03-22 15:10:47.000000000 
+1100
@@ -33,6 +33,13 @@ arch_get_unmapped_area (struct file *fil
        if (len > RGN_MAP_LIMIT)
                return -ENOMEM;
 
+       /* handle fixed mapping: prevent overlap with huge pages */
+       if (flags & MAP_FIXED) {
+               if (is_hugepage_only_range(mm, addr, len))
+                       return -EINVAL;
+               return addr;
+       }
+
 #ifdef CONFIG_HUGETLB_PAGE
        if (REGION_NUMBER(addr) == RGN_HPAGE)
                addr = 0;
Index: linux-cell/arch/ia64/mm/hugetlbpage.c
===================================================================
--- linux-cell.orig/arch/ia64/mm/hugetlbpage.c  2007-03-22 15:12:32.000000000 
+1100
+++ linux-cell/arch/ia64/mm/hugetlbpage.c       2007-03-22 15:12:39.000000000 
+1100
@@ -148,6 +148,14 @@ unsigned long hugetlb_get_unmapped_area(
                return -ENOMEM;
        if (len & ~HPAGE_MASK)
                return -EINVAL;
+
+       /* Handle MAP_FIXED */
+       if (flags & MAP_FIXED) {
+               if (prepare_hugepage_range(addr, len, pgoff))
+                       return -EINVAL;
+               return addr;
+       }
+
        /* This code assumes that RGN_HPAGE != 0. */
        if ((REGION_NUMBER(addr) != RGN_HPAGE) || (addr & (HPAGE_SIZE - 1)))
                addr = HPAGE_REGION_BASE;
 
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