diff options
| author | Michel Lespinasse <walken@google.com> | 2013-02-23 04:32:38 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-02-24 05:50:11 +0400 |
| commit | a1ea9549a7254b17ba85809f4a0200abc21453a2 (patch) | |
| tree | ec1f1a12a3adb777b99f98fef22c2ec4d0e18b28 | |
| parent | bebeb3d68b24bb4132d452c5707fe321208bcbcd (diff) | |
| download | linux-a1ea9549a7254b17ba85809f4a0200abc21453a2.tar.xz | |
mm: use mm_populate() for blocking remap_file_pages()
Signed-off-by: Michel Lespinasse <walken@google.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
Tested-by: Andy Lutomirski <luto@amacapital.net>
Cc: Greg Ungerer <gregungerer@westnet.com.au>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/fremap.c | 22 |
1 files changed, 6 insertions, 16 deletions
diff --git a/mm/fremap.c b/mm/fremap.c index 2db886e31044..b42e32171530 100644 --- a/mm/fremap.c +++ b/mm/fremap.c @@ -129,6 +129,7 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size, struct vm_area_struct *vma; int err = -EINVAL; int has_write_lock = 0; + vm_flags_t vm_flags; if (prot) return err; @@ -228,30 +229,16 @@ get_write_lock: /* * drop PG_Mlocked flag for over-mapped range */ - vm_flags_t saved_flags = vma->vm_flags; if (!has_write_lock) goto get_write_lock; + vm_flags = vma->vm_flags; munlock_vma_pages_range(vma, start, start + size); - vma->vm_flags = saved_flags; + vma->vm_flags = vm_flags; } mmu_notifier_invalidate_range_start(mm, start, start + size); err = vma->vm_ops->remap_pages(vma, start, size, pgoff); mmu_notifier_invalidate_range_end(mm, start, start + size); - if (!err) { - if (vma->vm_flags & VM_LOCKED) { - /* - * might be mapping previously unmapped range of file - */ - mlock_vma_pages_range(vma, start, start + size); - } else if (!(flags & MAP_NONBLOCK)) { - if (unlikely(has_write_lock)) { - downgrade_write(&mm->mmap_sem); - has_write_lock = 0; - } - make_pages_present(start, start+size); - } - } /* * We can't clear VM_NONLINEAR because we'd have to do @@ -260,10 +247,13 @@ get_write_lock: */ out: + vm_flags = vma->vm_flags; if (likely(!has_write_lock)) up_read(&mm->mmap_sem); else up_write(&mm->mmap_sem); + if (!err && ((vm_flags & VM_LOCKED) || !(flags & MAP_NONBLOCK))) + mm_populate(start, size); return err; } |