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Subject[PATCH 1/12] get_unmapped_area handles MAP_FIXED on powerpc
Handle MAP_FIXED in powerpc's arch_get_unmapped_area() in all 3
implementations of it.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: William Irwin <bill.irwin@oracle.com>

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 2007-04-24 15:10:17.000000000 +1000
+++ linux-cell/arch/powerpc/mm/hugetlbpage.c 2007-04-24 15:28:11.000000000 +1000
@@ -566,6 +566,13 @@ 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);
@@ -641,6 +648,13 @@ 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;
@@ -823,6 +837,13 @@ 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;

-
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