From: Keir Fraser <keir@xen.org>
Date: Fri, 21 Jan 2011 15:57:18 +0000 (+0000)
Subject: x86_32: Assert map_domian_page() not used too early.
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~10896^2~3
X-Git-Url: https://dgit.raspbian.org/%22http:/www.example.com/cgi/%22https://%22%22/%22http:/www.example.com/cgi/%22https:/%22%22?a=commitdiff_plain;h=f2154f99137f7021e76d2f5ad7e3155ff29fafde;p=xen.git

x86_32: Assert map_domian_page() not used too early.

Signed-off-by: Fengzhe Zhang <fengzhe.zhang@intel.com>
---

diff --git a/xen/arch/x86/x86_32/domain_page.c b/xen/arch/x86/x86_32/domain_page.c
index 55a3380776..4fb563d4f0 100644
--- a/xen/arch/x86/x86_32/domain_page.c
+++ b/xen/arch/x86/x86_32/domain_page.c
@@ -53,6 +53,8 @@ void *map_domain_page(unsigned long mfn)
     perfc_incr(map_domain_page_count);
 
     v = mapcache_current_vcpu();
+    /* Prevent vcpu pointer being used before initialize. */
+    ASSERT((unsigned long)v != 0xfffff000);
 
     dcache = &v->domain->arch.mapcache;
     vcache = &v->arch.mapcache;