Merge branch 'fixes-jgarzik' of git://git.kernel.org/pub/scm/linux/kernel/git/linvill...

[powerpc.git] / mm / memory.c

diff --git a/mm/memory.c b/mm/memory.c
index 61d51da..ca8cac1 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1765,6 +1765,15 @@ gotten:
 unlock:
        pte_unmap_unlock(page_table, ptl);
        if (dirty_page) {
+               /*
+                * Yes, Virginia, this is actually required to prevent a race
+                * with clear_page_dirty_for_io() from clearing the page dirty
+                * bit after it clear all dirty ptes, but before a racing
+                * do_wp_page installs a dirty pte.
+                *
+                * do_no_page is protected similarly.
+                */
+               wait_on_page_locked(dirty_page);
                set_page_dirty_balance(dirty_page);
                put_page(dirty_page);
        }
@@ -2650,8 +2659,6 @@ int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
        return handle_pte_fault(mm, vma, address, pte, pmd, write_access);
 }
 
-EXPORT_SYMBOL_GPL(handle_mm_fault);
-
 #ifndef __PAGETABLE_PUD_FOLDED
 /*
  * Allocate page upper directory.
@@ -2856,3 +2863,4 @@ int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, in
 
        return buf - old_buf;
 }
+EXPORT_SYMBOL_GPL(access_process_vm);