2.4.1-pre6

 mm

diff -u --recursive --new-file v2.4.0/linux/mm/memory.c linux/mm/memory.c
--- v2.4.0/linux/mm/memory.c   Mon Jan  1 10:37:41 2001
+++ linux/mm/memory.c   Mon Jan  8 15:39:38 2001
@@ -207,7 +207,8 @@
          
          src_pte = pte_offset(src_pmd, address);
          dst_pte = pte_offset(dst_pmd, address);
-         
+
+         spin_lock(&src->page_table_lock);         
          do {
             pte_t pte = *src_pte;
             struct page *ptepage;
@@ -240,16 +241,21 @@
 cont_copy_pte_range:      set_pte(dst_pte, pte);
 cont_copy_pte_range_noset:   address += PAGE_SIZE;
             if (address >= end)
-               goto out;
+               goto out_unlock;
             src_pte++;
             dst_pte++;
          } while ((unsigned long)src_pte & PTE_TABLE_MASK);
+         spin_unlock(&src->page_table_lock);
       
 cont_copy_pmd_range:   src_pmd++;
          dst_pmd++;
       } while ((unsigned long)src_pmd & PMD_TABLE_MASK);
    }
 out:
+   return 0;
+
+out_unlock:
+   spin_unlock(&src->page_table_lock);
    return 0;
 
 nomem: