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authorMichel Lespinasse <walken@google.com>2013-02-22 16:32:38 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-23 17:50:11 -0800
commita1ea9549a7254b17ba85809f4a0200abc21453a2 (patch)
treeec1f1a12a3adb777b99f98fef22c2ec4d0e18b28 /mm/fremap.c
parentbebeb3d68b24bb4132d452c5707fe321208bcbcd (diff)
downloadlinux-a1ea9549a7254b17ba85809f4a0200abc21453a2.tar.gz
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>
Diffstat (limited to 'mm/fremap.c')
-rw-r--r--mm/fremap.c22
1 files changed, 6 insertions, 16 deletions
diff --git a/mm/fremap.c b/mm/fremap.c
index 2db886e3104..b42e3217153 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;
}