From: Matthew Dillon <dillon@apollo.backplane.com>
Date: Fri, 5 Oct 2012 04:14:32 +0000 (-0700)
Subject: kernel - Acquire vm_token in pmap_remove_all()
X-Git-Tag: v3.2.0~26
X-Git-Url: https://gitweb.dragonflybsd.org/dragonfly.git/commitdiff_plain/bcc6a8acdb71c15106d6533a6567cb237d253ffb

kernel - Acquire vm_token in pmap_remove_all()

* Kitchen sink try to fix the wire_count panic, acquire vm_token
  in pmap_remove_all().
---

diff --git a/sys/platform/pc32/i386/pmap.c b/sys/platform/pc32/i386/pmap.c
index d60cabd26a..9d6c89cc23 100644
--- a/sys/platform/pc32/i386/pmap.c
+++ b/sys/platform/pc32/i386/pmap.c
@@ -2053,7 +2053,10 @@ pmap_remove_all(vm_page_t m)
 
 	if (!pmap_initialized || (m->flags & PG_FICTITIOUS))
 		return;
+	if (TAILQ_EMPTY(&m->md.pv_list))
+		return;
 
+	lwkt_getoken(&vm_token);
 	pmap_inval_init(&info);
 	while ((pv = TAILQ_FIRST(&m->md.pv_list)) != NULL) {
 		pmap = pv->pv_pmap;
@@ -2105,6 +2108,7 @@ pmap_remove_all(vm_page_t m)
 	}
 	KKASSERT((m->flags & (PG_MAPPED|PG_WRITEABLE)) == 0);
 	pmap_inval_done(&info);
+	lwkt_reloken(&vm_token);
 }
 
 /*