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Fix segment table reference bug (from Michael Hitch).

This commit is contained in:
briggs 1995-09-16 15:09:28 +00:00
parent a8b0260a05
commit 6ed4261a1b
1 changed files with 6 additions and 2 deletions
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8
sys/arch/mac68k/mac68k/pmap.c
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@ -1,4 +1,4 @@
/* $NetBSD: pmap.c,v 1.19 1995/07/08 04:25:18 briggs Exp $ */
/* $NetBSD: pmap.c,v 1.20 1995/09/16 15:09:28 briggs Exp $ */
/*
* Copyright (c) 1991, 1993
@ -2370,6 +2370,11 @@ pmap_enter_ptpage(pmap, va)
* letting the VM system allocate a zero-filled page.
*/
else {
/*
* Count the segment table reference now so that we won't
* lose the segment table when low on memory.
*/
pmap->pm_sref++;
#ifdef DEBUG
if (pmapdebug & (PDB_ENTER|PDB_PTPAGE))
printf("enter: about to fault UPT pg at %x\n", va);
@ -2454,7 +2459,6 @@ pmap_enter_ptpage(pmap, va)
#endif
*ste = (ptpa & SG_FRAME) | SG_RW | SG_V;
if (pmap != pmap_kernel()) {
pmap->pm_sref++;
#ifdef DEBUG
if (pmapdebug & (PDB_ENTER|PDB_PTPAGE|PDB_SEGTAB))
printf("enter: stab %x refcnt %d\n",