active_mm

With 2.4.0-test10 and 1.4pre43 I found I was getting an oops every time
a process which had /dev/gm* opened would exit.  Here's the fix:

Index: gm_arch.c
===================================================================
RCS file: /ufs/src/repositories/gm/drivers/linux/gm/gm_arch.c,v
retrieving revision 1.182
diff -u -r1.182 gm_arch.c
--- gm_arch.c   2000/12/20 23:42:08     1.182
+++ gm_arch.c   2000/12/21 20:21:50
@@ -623,7 +623,7 @@
 #warning **************************************************************
 #endif
        {
-               pgd = pgd_offset(gm_current->mm, addr);
+               pgd = pgd_offset(gm_current->active_mm, addr);
        }
        GM_PRINT (GM_DEBUG_KVIRT_TO_PHYS,
                          ("kvirt_to_phys pgd = 0x%lx\n", *pgd));


The problem is that an exiting process has already entered lazy mm state
before exit_files is called to close /dev/gm*, so access through current->mm
is invalid.  This is x86 smp no highmem, hopefully similar for other arches
and configs.

		-- Pete