xen: check for zero sized area when invalidating memory

[cascardo/linux.git] / arch / x86 / xen / setup.c

diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index 410210f..865e56c 100644 (file)
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -160,6 +160,8 @@ void __init xen_inv_extra_mem(void)
        int i;
 
        for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {
+               if (!xen_extra_mem[i].size)
+                       continue;
                pfn_s = PFN_DOWN(xen_extra_mem[i].start);
                pfn_e = PFN_UP(xen_extra_mem[i].start + xen_extra_mem[i].size);
                for (pfn = pfn_s; pfn < pfn_e; pfn++)