xen/generic: Disable fallback build on ARM.

As there is no need for it (the fallback code is for older
hypervisors and they only run under x86), and also b/c
we get:

drivers/xen/fallback.c: In function 'xen_event_channel_op_compat':
drivers/xen/fallback.c:10:19: error: storage size of 'op' isn't known
drivers/xen/fallback.c:15:2: error: implicit declaration of function '_hypercall1' [-Werror=implicit-function-declaration]
drivers/xen/fallback.c:15:19: error: expected expression before 'int'
drivers/xen/fallback.c:18:7: error: 'EVTCHNOP_close' undeclared (first use in this function)
drivers/xen/fallback.c:18:7: note: each undeclared identifier is reported only once for each function it appears in
.. and more

[v1: Moved the enablement to be covered by CONFIG_X86 per Ian's suggestion]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

diff --git a/drivers/xen/Makefile b/drivers/xen/Makefile
index 46de6cdfccb35b8560e57a50babce496754d0bd6..74354708c6c4e7dd9040ead14affbfa88924ca74 100644 (file)
--- a/drivers/xen/Makefile
+++ b/drivers/xen/Makefile
@@ -2,7 +2,8 @@ ifneq ($(CONFIG_ARM),y)
 obj-y  += manage.o balloon.o
 obj-$(CONFIG_HOTPLUG_CPU)              += cpu_hotplug.o
 endif
-obj-y  += grant-table.o features.o events.o fallback.o
+obj-$(CONFIG_X86)                      += fallback.o
+obj-y  += grant-table.o features.o events.o
 obj-y  += xenbus/
 
 nostackp := $(call cc-option, -fno-stack-protector)