[src/trunk]: src/sys/arch/hppa/hppa Give pmap uvm_objects an empty pagerops t...

[ad <ad%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/60251f8ec392
branches:  trunk
changeset: 745426:60251f8ec392
user:      ad <ad%NetBSD.org@localhost>
date:      Sun Mar 01 21:40:45 2020 +0000

description:
Give pmap uvm_objects an empty pagerops to avoid special casing in UVM.
(This use of uvm_object causes a disproportionate amount of work.)

diffstat:

 sys/arch/hppa/hppa/pmap.c |  12 ++++++++----
 1 files changed, 8 insertions(+), 4 deletions(-)

diffs (47 lines):

diff -r f78c3d591ef6 -r 60251f8ec392 sys/arch/hppa/hppa/pmap.c
--- a/sys/arch/hppa/hppa/pmap.c Sun Mar 01 21:39:07 2020 +0000
+++ b/sys/arch/hppa/hppa/pmap.c Sun Mar 01 21:40:45 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: pmap.c,v 1.104 2020/02/24 20:42:18 ad Exp $    */
+/*     $NetBSD: pmap.c,v 1.105 2020/03/01 21:40:45 ad Exp $    */
 
 /*-
  * Copyright (c) 2001, 2002 The NetBSD Foundation, Inc.
@@ -65,7 +65,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.104 2020/02/24 20:42:18 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.105 2020/03/01 21:40:45 ad Exp $");
 
 #include "opt_cputype.h"
 
@@ -158,6 +158,10 @@
 u_int  hppa_prot[8];
 u_int  sid_counter;
 
+static const struct uvm_pagerops pmap_pager = {
+       /* nothing */
+};
+
 /*
  * Page 3-6 of the "PA-RISC 1.1 Architecture and Instruction Set
  * Reference Manual" (HP part number 09740-90039) defines equivalent
@@ -696,7 +700,7 @@
        memset(kpm, 0, sizeof(*kpm));
 
        rw_init(&kpm->pm_obj_lock);
-       uvm_obj_init(&kpm->pm_obj, NULL, false, 1);
+       uvm_obj_init(&kpm->pm_obj, &pmap_pager, false, 1);
        uvm_obj_setlock(&kpm->pm_obj, &kpm->pm_obj_lock);
 
        kpm->pm_space = HPPA_SID_KERNEL;
@@ -1059,7 +1063,7 @@
        DPRINTF(PDB_FOLLOW|PDB_PMAP, ("%s: pmap = %p\n", __func__, pmap));
 
        rw_init(&pmap->pm_obj_lock);
-       uvm_obj_init(&pmap->pm_obj, NULL, false, 1);
+       uvm_obj_init(&pmap->pm_obj, &pmap_pager, false, 1);
        uvm_obj_setlock(&pmap->pm_obj, &pmap->pm_obj_lock);
 
        mutex_enter(&pmaps_lock);