[src/trunk]: src/sys/arch/mips/mips Grab pv_list lock in pmap_unmap_ephemeral...

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

details:   https://anonhg.NetBSD.org/src/rev/7b90d3632f48
branches:  trunk
changeset: 795819:7b90d3632f48
user:      skrll <skrll%NetBSD.org@localhost>
date:      Sat May 03 06:55:04 2014 +0000

description:
Grab pv_list lock in pmap_unmap_ephemeral_page only when needed.

diffstat:

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

diffs (38 lines):

diff -r d68fc5f9e95e -r 7b90d3632f48 sys/arch/mips/mips/pmap.c
--- a/sys/arch/mips/mips/pmap.c Fri May 02 23:49:10 2014 +0000
+++ b/sys/arch/mips/mips/pmap.c Sat May 03 06:55:04 2014 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: pmap.c,v 1.210 2014/04/23 20:57:15 skrll Exp $ */
+/*     $NetBSD: pmap.c,v 1.211 2014/05/03 06:55:04 skrll Exp $ */
 
 /*-
  * Copyright (c) 1998, 2001 The NetBSD Foundation, Inc.
@@ -67,7 +67,7 @@
 
 #include <sys/cdefs.h>
 
-__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.210 2014/04/23 20:57:15 skrll Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.211 2014/05/03 06:55:04 skrll Exp $");
 
 /*
  *     Manages physical address maps.
@@ -453,8 +453,8 @@
        struct vm_page_md * const md = VM_PAGE_TO_MD(pg);
        pv_entry_t pv = &md->pvh_first;
        
-       (void)PG_MD_PVLIST_LOCK(md, false);
        if (MIPS_CACHE_VIRTUAL_ALIAS) {
+               (void)PG_MD_PVLIST_LOCK(md, false);
                if (PG_MD_CACHED_P(md)
                    || (pv->pv_pmap != NULL
                        && mips_cache_badalias(pv->pv_va, va))) {
@@ -466,8 +466,8 @@
                         */
                        mips_dcache_wbinv_range(va, PAGE_SIZE);
                }
+               PG_MD_PVLIST_UNLOCK(md);
        }
-       PG_MD_PVLIST_UNLOCK(md);
 #ifndef _LP64
        /*
         * If we had to map using a page table entry, unmap it now.