[PATCH] x86/ACPI: Fix build error when tboot is disabled

[Costin Lupu <costin.lupu@xxxxxxxxx>]

When tboot is disabled via menuconfig we get undefined reference error for
g_tboot_shared. This patch fixes that by disabling the causing source code
when tboot is disabled.

Signed-off-by: Costin Lupu <costin.lupu@xxxxxxxxx>
---
 xen/arch/x86/acpi/power.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/xen/arch/x86/acpi/power.c b/xen/arch/x86/acpi/power.c
index 91a8c4d0bd..29d9775aed 100644
--- a/xen/arch/x86/acpi/power.c
+++ b/xen/arch/x86/acpi/power.c
@@ -407,6 +407,7 @@ static int acpi_get_wake_status(void)
     return val;
 }
 
+#ifdef CONFIG_TBOOT
 static void tboot_sleep(u8 sleep_state)
 {
     uint32_t shutdown_type;
@@ -451,18 +452,21 @@ static void tboot_sleep(u8 sleep_state)
 
     tboot_shutdown(shutdown_type);
 }
+#endif
 
 /* System is really put into sleep state by this stub */
 acpi_status acpi_enter_sleep_state(u8 sleep_state)
 {
     acpi_status status;
 
+#ifdef CONFIG_TBOOT
     if ( tboot_in_measured_env() )
     {
         tboot_sleep(sleep_state);
         printk(XENLOG_ERR "TBOOT failed entering s3 state\n");
         return_ACPI_STATUS(AE_ERROR);
     }
+#endif
 
     ACPI_FLUSH_CPU_CACHE();
 
-- 
2.20.1