Merge tag 'dm-3.17-fix2' of git://git.kernel.org/pub/scm/linux/kernel/git/device...

[karo-tx-linux.git] / arch / arm / xen / enlighten.c

diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
index 98544c5f86e99710a7845e7a55648cdf73c14599..0e15f011f9c86895db17d57e0e1e999164d0312c 100644 (file)
--- a/arch/arm/xen/enlighten.c
+++ b/arch/arm/xen/enlighten.c
@@ -260,6 +260,12 @@ static int __init xen_guest_init(void)
        xen_domain_type = XEN_HVM_DOMAIN;
 
        xen_setup_features();
+
+       if (!xen_feature(XENFEAT_grant_map_identity)) {
+               pr_warn("Please upgrade your Xen.\n"
+                               "If your platform has any non-coherent DMA devices, they won't work properly.\n");
+       }
+
        if (xen_feature(XENFEAT_dom0))
                xen_start_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
        else