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mm: use vm_unmapped_area() on ia64 architecture

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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>
This commit is contained in:
Michel Lespinasse 2013-02-21 15:10:28 -08:00 committed by Tony Luck
parent 19f949f525
commit f53f232504
1 changed files with 11 additions and 24 deletions
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35
arch/ia64/kernel/sys_ia64.c
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@ -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;
align_mask = PAGE_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;
}
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