[XEN][PATCH v6 13/19] asm/smp.h: Fix circular dependency for device_tree.h and rwlock.h

[Vikram Garhwal <vikram.garhwal@xxxxxxx>]

Dynamic programming ops will modify the dt_host and there might be other
function which are browsing the dt_host at the same time. To avoid the race
conditions, adding rwlock for browsing the dt_host. But adding rwlock in
device_tree.h causes following circular dependency:
    device_tree.h->rwlock.h->smp.h->asm/smp.h->device_tree.h

To fix this, removed the "#include <xen/device_tree.h> and forward declared
"struct dt_device_node".

Signed-off-by: Vikram Garhwal <vikram.garhwal@xxxxxxx>
Reviewed-by: Henry Wang <Henry.Wang@xxxxxxx>
Reviewed-by: Michal Orzel <michal.orzel@xxxxxxx>
---
 xen/arch/arm/include/asm/smp.h | 3 ++-
 xen/arch/arm/smpboot.c         | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/include/asm/smp.h b/xen/arch/arm/include/asm/smp.h
index a37ca55bff..b12949ba8a 100644
--- a/xen/arch/arm/include/asm/smp.h
+++ b/xen/arch/arm/include/asm/smp.h
@@ -3,13 +3,14 @@
 
 #ifndef __ASSEMBLY__
 #include <xen/cpumask.h>
-#include <xen/device_tree.h>
 #include <asm/current.h>
 #endif
 
 DECLARE_PER_CPU(cpumask_var_t, cpu_sibling_mask);
 DECLARE_PER_CPU(cpumask_var_t, cpu_core_mask);
 
+struct dt_device_node;
+
 #define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))
 
 #define smp_processor_id() get_processor_id()
diff --git a/xen/arch/arm/smpboot.c b/xen/arch/arm/smpboot.c
index 4a89b3a834..255bbcc967 100644
--- a/xen/arch/arm/smpboot.c
+++ b/xen/arch/arm/smpboot.c
@@ -10,6 +10,7 @@
 #include <xen/cpu.h>
 #include <xen/cpumask.h>
 #include <xen/delay.h>
+#include <xen/device_tree.h>
 #include <xen/domain_page.h>
 #include <xen/errno.h>
 #include <xen/init.h>
-- 
2.17.1