struct zonelist *zonelist;
struct zone *zone;
struct zoneref *z;
+ unsigned int cpuset_mems_cookie;
- get_mems_allowed();
+retry_cpuset:
+ cpuset_mems_cookie = get_mems_allowed();
zonelist = huge_zonelist(vma, address,
htlb_alloc_mask, &mpol, &nodemask);
/*
}
}
}
-err:
+
mpol_cond_put(mpol);
- put_mems_allowed();
+ if (unlikely(!put_mems_allowed(cpuset_mems_cookie) && !page))
+ goto retry_cpuset;
return page;
+
+err:
+ mpol_cond_put(mpol);
+ return NULL;
}
static void update_and_free_page(struct hstate *h, struct page *page)
}
}
+void __unmap_hugepage_range_final(struct vm_area_struct *vma,
+ unsigned long start, unsigned long end,
+ struct page *ref_page)
+{
+ __unmap_hugepage_range(vma, start, end, ref_page);
+
+ /*
+ * Clear this flag so that x86's huge_pmd_share page_table_shareable
+ * test will fail on a vma being torn down, and not grab a page table
+ * on its way out. We're lucky that the flag has such an appropriate
+ * name, and can in fact be safely cleared here. We could clear it
+ * before the __unmap_hugepage_range above, but all that's necessary
+ * is to clear it before releasing the i_mmap_mutex. This works
+ * because in the context this is called, the VMA is about to be
+ * destroyed and the i_mmap_mutex is held.
+ */
+ vma->vm_flags &= ~VM_MAYSHARE;
+}
+
void unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start,
unsigned long end, struct page *ref_page)
{
* from page cache lookup which is in HPAGE_SIZE units.
*/
address = address & huge_page_mask(h);
- pgoff = ((address - vma->vm_start) >> PAGE_SHIFT)
- + (vma->vm_pgoff >> PAGE_SHIFT);
+ pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) +
+ vma->vm_pgoff;
mapping = vma->vm_file->f_dentry->d_inode->i_mapping;
/*
}
}
spin_unlock(&mm->page_table_lock);
- mutex_unlock(&vma->vm_file->f_mapping->i_mmap_mutex);
-
+ /*
+ * Must flush TLB before releasing i_mmap_mutex: x86's huge_pmd_unshare
+ * may have cleared our pud entry and done put_page on the page table:
+ * once we release i_mmap_mutex, another task can do the final put_page
+ * and that page table be reused and filled with junk.
+ */
flush_tlb_range(vma, start, end);
+ mutex_unlock(&vma->vm_file->f_mapping->i_mmap_mutex);
}
int hugetlb_reserve_pages(struct inode *inode,