[xen staging] xen/arm: ffa: fix build with clang/ATfE

[patchbot@xxxxxxx]

commit b89ecb4dd455683eb1d544146d464ca909558151
Author:     Dmytro Prokopchuk1 <dmytro_prokopchuk1@xxxxxxxx>
AuthorDate: Tue Apr 21 08:13:35 2026 +0000
Commit:     Michal Orzel <michal.orzel@xxxxxxx>
CommitDate: Thu Apr 23 15:12:32 2026 +0200

    xen/arm: ffa: fix build with clang/ATfE
    
    Clang 22.x.x or Arm Toolchain for Embedded 22.x.x reports:
    
    In file included from arch/arm/tee/ffa.c:75:
    arch/arm/tee/ffa_private.h:439:17: error: 'used' attribute ignored on a 
non-definition declaration [-Werror,-Wignored-attributes]
      439 | extern uint32_t __ro_after_init ffa_fw_version;
          |                 ^
    
    There is a fix for clang 16 in the git history:
    a1a1e2b7dc4f ("xen/arm: ffa: fix build with clang")
    which was broken by the following commit:
    a90376c6adbc ("xen/arm: ffa: Add FF-A 1.2 endpoint memory access 
descriptors")
    
    Remove __ro_after_init from the extern declaration of ffa_fw_version.
    The attribute is already present on the definition in ffa.c, which is
    sufficient and correct.
    
    Fixes: a90376c6adbc ("xen/arm: ffa: Add FF-A 1.2 endpoint memory access 
descriptors")
    Signed-off-by: Dmytro Prokopchuk <dmytro_prokopchuk1@xxxxxxxx>
    Reviewed-by: Bertrand Marquis <bertrand.marquis@xxxxxxx>
---
 xen/arch/arm/tee/ffa_private.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/arm/tee/ffa_private.h b/xen/arch/arm/tee/ffa_private.h
index c291f32b56..e16bc0d83d 100644
--- a/xen/arch/arm/tee/ffa_private.h
+++ b/xen/arch/arm/tee/ffa_private.h
@@ -436,7 +436,7 @@ struct ffa_ctx {
 };
 
 extern DECLARE_BITMAP(ffa_fw_abi_supported, FFA_ABI_BITMAP_SIZE);
-extern uint32_t __ro_after_init ffa_fw_version;
+extern uint32_t ffa_fw_version;
 
 extern struct list_head ffa_ctx_head;
 extern rwlock_t ffa_ctx_list_rwlock;
--
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