KVM: x86: Convert TSC writes to TSC offset writes

[pandora-kernel.git] / mm / rmap.c

diff --git a/mm/rmap.c b/mm/rmap.c
index f6f0d2d..92e6757 100644 (file)
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -381,7 +381,13 @@ vma_address(struct page *page, struct vm_area_struct *vma)
 unsigned long page_address_in_vma(struct page *page, struct vm_area_struct *vma)
 {
        if (PageAnon(page)) {
-               if (vma->anon_vma->root != page_anon_vma(page)->root)
+               struct anon_vma *page__anon_vma = page_anon_vma(page);
+               /*
+                * Note: swapoff's unuse_vma() is more efficient with this
+                * check, and needs it to match anon_vma when KSM is active.
+                */
+               if (!vma->anon_vma || !page__anon_vma ||
+                   vma->anon_vma->root != page__anon_vma->root)
                        return -EFAULT;
        } else if (page->mapping && !(vma->vm_flags & VM_NONLINEAR)) {
                if (!vma->vm_file ||
@@ -1564,13 +1570,14 @@ static void __hugepage_set_anon_rmap(struct page *page,
        struct vm_area_struct *vma, unsigned long address, int exclusive)
 {
        struct anon_vma *anon_vma = vma->anon_vma;
+
        BUG_ON(!anon_vma);
-       if (!exclusive) {
-               struct anon_vma_chain *avc;
-               avc = list_entry(vma->anon_vma_chain.prev,
-                                struct anon_vma_chain, same_vma);
-               anon_vma = avc->anon_vma;
-       }
+
+       if (PageAnon(page))
+               return;
+       if (!exclusive)
+               anon_vma = anon_vma->root;
+
        anon_vma = (void *) anon_vma + PAGE_MAPPING_ANON;
        page->mapping = (struct address_space *) anon_vma;
        page->index = linear_page_index(vma, address);
@@ -1581,6 +1588,8 @@ void hugepage_add_anon_rmap(struct page *page,
 {
        struct anon_vma *anon_vma = vma->anon_vma;
        int first;
+
+       BUG_ON(!PageLocked(page));
        BUG_ON(!anon_vma);
        BUG_ON(address < vma->vm_start || address >= vma->vm_end);
        first = atomic_inc_and_test(&page->_mapcount);