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authorMichel Lespinasse <walken@google.com>2013-02-21 15:10:28 -0800
committerTony Luck <tony.luck@intel.com>2013-02-22 13:46:59 -0800
commitf53f232504253a5e9f8f19ac1aa1b9161d7e6d2a (patch)
treeb15d7f891d7b4a68006feda62b63309e4f3177de /arch/ia64/kernel
parent19f949f52599ba7c3f67a5897ac6be14bfcb1200 (diff)
mm: use vm_unmapped_area() on ia64 architecture
Update the ia64 arch_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>
Diffstat (limited to 'arch/ia64/kernel')
-rw-r--r--arch/ia64/kernel/sys_ia64.c37
1 files changed, 12 insertions, 25 deletions
diff --git a/arch/ia64/kernel/sys_ia64.c b/arch/ia64/kernel/sys_ia64.c
index d9439ef2f661..41e33f84c185 100644
--- a/arch/ia64/kernel/sys_ia64.c
+++ b/arch/ia64/kernel/sys_ia64.c
@@ -25,9 +25,9 @@ arch_get_unmapped_area (struct file *filp, unsigned long addr, unsigned long len
unsigned long pgoff, unsigned long flags)
{
long map_shared = (flags & MAP_SHARED);
- unsigned long start_addr, align_mask = PAGE_SIZE - 1;
+ unsigned long align_mask = 0;
struct mm_struct *mm = current->mm;
- struct vm_area_struct *vma;
+ struct vm_unmapped_area_info info;
if (len > RGN_MAP_LIMIT)
return -ENOMEM;
@@ -44,7 +44,7 @@ arch_get_unmapped_area (struct file *filp, unsigned long addr, unsigned long len
addr = 0;
#endif
if (!addr)
- addr = mm->free_area_cache;
+ addr = TASK_UNMAPPED_BASE;
if (map_shared && (TASK_SIZE > 0xfffffffful))
/*
@@ -53,28 +53,15 @@ arch_get_unmapped_area (struct file *filp, unsigned long addr, unsigned long len
* tasks, we prefer to avoid exhausting the address space too quickly by
* limiting alignment to a single page.
*/
- align_mask = SHMLBA - 1;
-
- full_search:
- start_addr = addr = (addr + align_mask) & ~align_mask;
-
- for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
- /* At this point: (!vma || addr < vma->vm_end). */
- if (TASK_SIZE - len < addr || RGN_MAP_LIMIT - len < REGION_OFFSET(addr)) {
- if (start_addr != TASK_UNMAPPED_BASE) {
- /* Start a new search --- just in case we missed some holes. */
- addr = TASK_UNMAPPED_BASE;
- goto full_search;
- }
- return -ENOMEM;
- }
- if (!vma || addr + len <= vma->vm_start) {
- /* Remember the address where we stopped this search: */
- mm->free_area_cache = addr + len;
- return addr;
- }
- addr = (vma->vm_end + align_mask) & ~align_mask;
- }
+ align_mask = PAGE_MASK & (SHMLBA - 1);
+
+ info.flags = 0;
+ info.length = len;
+ info.low_limit = addr;
+ info.high_limit = TASK_SIZE;
+ info.align_mask = align_mask;
+ info.align_offset = 0;
+ return vm_unmapped_area(&info);
}
asmlinkage long