[src/trunk]: src/sys/arch/aarch64/aarch64 - remove incorrect KASSERT. mmap(2)...

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

details:   https://anonhg.NetBSD.org/src/rev/50d657b6a3be
branches:  trunk
changeset: 1003254:50d657b6a3be
user:      ryo <ryo%NetBSD.org@localhost>
date:      Sat Sep 07 09:57:37 2019 +0000

description:
- remove incorrect KASSERT. mmap(2) with prot=PROT_WRITE calls pmap_enter(..., PROT_WRITE) internally.
- fix to update page reference flags when only PROT_WRITE or PROT_EXECUTE specified

diffstat:

 sys/arch/aarch64/aarch64/pmap.c |  11 ++++-------
 1 files changed, 4 insertions(+), 7 deletions(-)

diffs (47 lines):

diff -r 29600bc68252 -r 50d657b6a3be sys/arch/aarch64/aarch64/pmap.c
--- a/sys/arch/aarch64/aarch64/pmap.c   Sat Sep 07 09:46:07 2019 +0000
+++ b/sys/arch/aarch64/aarch64/pmap.c   Sat Sep 07 09:57:37 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: pmap.c,v 1.43 2019/08/15 10:24:26 skrll Exp $  */
+/*     $NetBSD: pmap.c,v 1.44 2019/09/07 09:57:37 ryo Exp $    */
 
 /*
  * Copyright (c) 2017 Ryo Shimizu <ryo%nerv.org@localhost>
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.43 2019/08/15 10:24:26 skrll Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.44 2019/09/07 09:57:37 ryo Exp $");
 
 #include "opt_arm_debug.h"
 #include "opt_ddb.h"
@@ -1718,9 +1718,8 @@
        /*
         * read permission is treated as an access permission internally.
         * require to add PROT_READ even if only PROT_WRITE or PROT_EXEC
-        * for wired mapping.
         */
-       if ((flags & PMAP_WIRED) && (prot & (VM_PROT_WRITE|VM_PROT_EXECUTE)))
+       if (prot & (VM_PROT_WRITE|VM_PROT_EXECUTE))
                prot |= VM_PROT_READ;
 
        mdattr = VM_PROT_READ | VM_PROT_WRITE;
@@ -1748,7 +1747,7 @@
        if (pg != NULL) {
                /* update referenced/modified flags */
                VM_PAGE_TO_MD(pg)->mdpg_flags |=
-                   (flags & (VM_PROT_READ | VM_PROT_WRITE));
+                   (prot & (VM_PROT_READ | VM_PROT_WRITE));
                mdattr &= VM_PAGE_TO_MD(pg)->mdpg_flags;
        }
 
@@ -1818,8 +1817,6 @@
 int
 pmap_enter(struct pmap *pm, vaddr_t va, paddr_t pa, vm_prot_t prot, u_int flags)
 {
-       KASSERT((prot & VM_PROT_READ) || !(prot & VM_PROT_WRITE));
-
        return _pmap_enter(pm, va, pa, prot, flags, false);
 }