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uvm_fault_internal: In lower fault handling case, put another goto to clarify 

that we don't care lower neighboring pages for the zero-fill object.
This commit is contained in:
uebayasi 2010-01-31 07:46:03 +00:00
parent 19311f603b
commit 3f944b46d0
1 changed files with 9 additions and 7 deletions
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16
sys/uvm/uvm_fault.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: uvm_fault.c,v 1.134 2010/01/31 07:37:24 uebayasi Exp $ */
/* $NetBSD: uvm_fault.c,v 1.135 2010/01/31 07:46:03 uebayasi Exp $ */
/*
*
@ -39,7 +39,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uvm_fault.c,v 1.134 2010/01/31 07:37:24 uebayasi Exp $");
__KERNEL_RCSID(0, "$NetBSD: uvm_fault.c,v 1.135 2010/01/31 07:46:03 uebayasi Exp $");
#include "opt_uvmhist.h"
@ -1045,7 +1045,12 @@ ReFault:
* (PGO_LOCKED).
*/
if (uobj) {
if (uobj == NULL) {
/* zero fill; don't care neighbor pages */
uobjpage = NULL;
goto lower_fault_lookup_done;
}
mutex_enter(&uobj->vmobjlock);
/* locked (!shadowed): maps(read), amap (if there), uobj */
/*
@ -1147,10 +1152,7 @@ ReFault:
pmap_update(ufi.orig_map->pmap);
lower_fault_lookup_done:
{}
} else {
uobjpage = NULL;
}
{}
/* locked: maps(read), amap(if there), uobj(if !null), uobjpage(if !null) */
KASSERT(!shadowed);