[PATCH 1/14] get_unmapped_area handles MAP_FIXED on powerpc

Benjamin Herrenschmidt
2007-04-04T04:02:12Z

---

arch/powerpc/mm/hugetlbpage.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)

Index: linux-cell/arch/powerpc/mm/hugetlbpage.c
===================================================================
--- linux-cell.orig/arch/powerpc/mm/hugetlbpage.c 2007-03-22 14:52:07.000000000 +1100
+++ linux-cell/arch/powerpc/mm/hugetlbpage.c 2007-03-22 14:57:40.000000000 +1100
@@ -572,6 +572,13 @@ unsigned long arch_get_unmapped_area(str
if (len > TASK_SIZE)
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;
+ }
+
if (addr) {
addr = PAGE_ALIGN(addr);
vma = find_vma(mm, addr);
@@ -647,6 +654,13 @@ arch_get_unmapped_area_topdown(struct fi
if (len > TASK_SIZE)
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;
+ }
+
/* dont allow allocations above current base */
if (mm->free_area_cache > base)
mm->free_area_cache = base;
@@ -829,6 +843,13 @@ unsigned long hugetlb_get_unmapped_area(
/* Paranoia, caller should have dealt with this */
BUG_ON((addr + len) < addr);

+ /* Handle MAP_FIXED */
+ if (flags & MAP_FIXED) {
+ if (prepare_hugepage_range(addr, len, pgoff))
+ return -EINVAL;
+ return addr;
+ }
+
if (test_thread_flag(TIF_32BIT)) {
curareas = current->mm->context.low_htlb_areas;