[PATCH 6/14] get_unmapped_area handles MAP_FIXED on ia64

Benjamin Herrenschmidt
2007-04-04T04:06:14Z

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;