[PATCH v2] xen/arm: ffa: fix build with clang

[Stewart Hildebrand <stewart.hildebrand@xxxxxxx>]

Clang 16 reports:

In file included from arch/arm/tee/ffa.c:72:
arch/arm/tee/ffa_private.h:329:17: error: 'used' attribute ignored on a 
non-definition declaration [-Werror,-Wignored-attributes]
extern uint32_t __ro_after_init ffa_fw_version;
                ^

The variable ffa_fw_version is only used in ffa.c. Remove the
declaration in the header and make the definition in ffa.c static.

Fixes: 2f9f240a5e87 ("xen/arm: ffa: Fine granular call support")
Signed-off-by: Stewart Hildebrand <stewart.hildebrand@xxxxxxx>
---
v1->v2:
* remove declaration and make definition static
---
 xen/arch/arm/tee/ffa.c         | 2 +-
 xen/arch/arm/tee/ffa_private.h | 1 -
 2 files changed, 1 insertion(+), 2 deletions(-)

diff --git a/xen/arch/arm/tee/ffa.c b/xen/arch/arm/tee/ffa.c
index 87775ed88ffd..3bbdd7168a6b 100644
--- a/xen/arch/arm/tee/ffa.c
+++ b/xen/arch/arm/tee/ffa.c
@@ -72,7 +72,7 @@
 #include "ffa_private.h"
 
 /* Negotiated FF-A version to use with the SPMC, 0 if not there or supported */
-uint32_t __ro_after_init ffa_fw_version;
+static uint32_t __ro_after_init ffa_fw_version;
 
 /* Features supported by the SPMC or secure world when present */
 DECLARE_BITMAP(ffa_fw_abi_supported, FFA_ABI_BITMAP_SIZE);
diff --git a/xen/arch/arm/tee/ffa_private.h b/xen/arch/arm/tee/ffa_private.h
index d441c0ca5598..c4cd65538908 100644
--- a/xen/arch/arm/tee/ffa_private.h
+++ b/xen/arch/arm/tee/ffa_private.h
@@ -326,7 +326,6 @@ extern void *ffa_rx;
 extern void *ffa_tx;
 extern spinlock_t ffa_rx_buffer_lock;
 extern spinlock_t ffa_tx_buffer_lock;
-extern uint32_t __ro_after_init ffa_fw_version;
 extern DECLARE_BITMAP(ffa_fw_abi_supported, FFA_ABI_BITMAP_SIZE);
 
 bool ffa_shm_domain_destroy(struct domain *d);

base-commit: 70f5a875becc9444a959830b10a361982c31a366
-- 
2.47.1