static int mlock_fixup(struct vm_area_struct * vma,
unsigned long start, unsigned long end, unsigned int newflags)
{
struct mm_struct * mm = vma->vm_mm;
int pages;
int ret = 0;
if (newflags == vma->vm_flags)
goto out;
if (start != vma->vm_start) {
if (split_vma(mm, vma, start, 1)) {
ret = -EAGAIN;
goto out;
}
}
if (end != vma->vm_end) {
if (split_vma(mm, vma, end, 0)) {
ret = -EAGAIN;
goto out;
}
}
/*
* vm_flags is protected by the mmap_sem held in write mode.
* It's okay if try_to_unmap_one unmaps a page just after we
* set VM_LOCKED, make_pages_present below will bring it back.
*/
vma->vm_flags = newflags;
/*
* Keep track of amount of locked VM.
*/
pages = (end - start) >> PAGE_SHIFT;
if (newflags & VM_LOCKED) {
pages = -pages;
ret = make_pages_present(start, end);
}
vma->vm_mm->locked_vm -= pages;
out:
return ret;
}
static int mlock_fixup(struct vm_area_struct * vma,
unsigned long start, unsigned long end, unsigned int newflags)
{
struct mm_struct * mm = vma->vm_mm;
int pages;
int ret = 0;
if (newflags == vma->vm_flags)
goto out;
if (start != vma->vm_start) {
if (split_vma(mm, vma, start, 1)) {
ret = -EAGAIN;
goto out;
}
}
if (end != vma->vm_end) {
if (split_vma(mm, vma, end, 0)) {
ret = -EAGAIN;
goto out;
}
}
spin_lock(&mm->page_table_lock);
vma->vm_flags = newflags;
spin_unlock(&mm->page_table_lock);
/*
* Keep track of amount of locked VM.
*/
pages = (end - start) >> PAGE_SHIFT;
if (newflags & VM_LOCKED) {
pages = -pages;
ret = make_pages_present(start, end);
}
vma->vm_mm->locked_vm -= pages;
out:
return ret;
}