2.3.7

 mm

diff -u --recursive --new-file v2.3.6/linux/mm/mmap.c linux/mm/mmap.c
--- v2.3.6/linux/mm/mmap.c   Mon Jun  7 11:15:33 1999
+++ linux/mm/mmap.c   Wed Jun 16 19:26:27 1999
@@ -63,7 +63,7 @@
        return 1;
 
    free = buffermem >> PAGE_SHIFT;
-   free += page_cache_size;
+   free += atomic_read(&page_cache_size);
    free += nr_free_pages;
    free += nr_swap_pages;
    free -= (page_cache.min_percent + buffer_mem.min_percent + 2)*num_physpages/100; 
@@ -727,6 +727,10 @@
    struct mm_struct * mm = current->mm;
    struct vm_area_struct * vma;
    unsigned long flags, retval;
+
+   len = PAGE_ALIGN(len);
+   if (!len)
+      return addr;
 
    /*
     * mlock MCL_FUTURE?