Make xen_features and force_evtchn_callback() non-GPL

symbols as they are used in a variety of ubiquitous
kernel macros.

Signed-off-by: Keir Fraser <keir@xensource.com>

linux-2.6-xen-sparse/drivers/xen/core/evtchn.c

@@ -188,7 +188,8 @@ void force_evtchn_callback(void)
 {
 	(void)HYPERVISOR_xen_version(0, NULL);
 }
-EXPORT_SYMBOL_GPL(force_evtchn_callback);
+/* Not a GPL symbol: used in ubiquitous macros, so too restrictive. */
+EXPORT_SYMBOL(force_evtchn_callback);
 
 /* NB. Interrupts are disabled on entry. */
 asmlinkage void evtchn_do_upcall(struct pt_regs *regs)

linux-2.6-xen-sparse/drivers/xen/core/features.c

@@ -12,7 +12,8 @@
 #include <xen/features.h>
 
 u8 xen_features[XENFEAT_NR_SUBMAPS * 32] __read_mostly;
-EXPORT_SYMBOL_GPL(xen_features);
+/* Not a GPL symbol: used in ubiquitous macros, so too restrictive. */
+EXPORT_SYMBOL(xen_features);
 
 void setup_xen_features(void)
 {