mm: use vm_unmapped_area() in hugetlbfs on ia64 architecture

Update the ia64 hugetlb_get_unmapped_area function to make use of
vm_unmapped_area() instead of implementing a brute force search.

Signed-off-by: Michel Lespinasse <walken@google.com>
Acked-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 9 insertions, 11 deletions

diff --git a/arch/ia64/mm/hugetlbpage.c b/arch/ia64/mm/hugetlbpage.c
index 5ca674b74737..76069c18ee42 100644
--- a/arch/ia64/mm/hugetlbpage.c
+++ b/arch/ia64/mm/hugetlbpage.c
@@ -148,7 +148,7 @@ void hugetlb_free_pgd_range(struct mmu_gather *tlb,
 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, unsigned long len,
                 unsigned long pgoff, unsigned long flags)
 {
-        struct vm_area_struct *vmm;
+        struct vm_unmapped_area_info info;
 
         if (len > RGN_MAP_LIMIT)
                 return -ENOMEM;
@@ -165,16 +165,14 @@ unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, u
         /* This code assumes that RGN_HPAGE != 0. */
         if ((REGION_NUMBER(addr) != RGN_HPAGE) || (addr & (HPAGE_SIZE - 1)))
                 addr = HPAGE_REGION_BASE;
-        else
-                addr = ALIGN(addr, HPAGE_SIZE);
-        for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
-                /* At this point:  (!vmm || addr < vmm->vm_end). */
-                if (REGION_OFFSET(addr) + len > RGN_MAP_LIMIT)
-                        return -ENOMEM;
-                if (!vmm || (addr + len) <= vmm->vm_start)
-                        return addr;
-                addr = ALIGN(vmm->vm_end, HPAGE_SIZE);
-        }
+
+        info.flags = 0;
+        info.length = len;
+        info.low_limit = addr;
+        info.high_limit = HPAGE_REGION_BASE + RGN_MAP_LIMIT;
+        info.align_mask = PAGE_MASK & (HPAGE_SIZE - 1);
+        info.align_offset = 0;
+        return vm_unmapped_area(&info);
 }
 
 static int __init hugetlb_setup_sz(char *str)