[xen staging] xen/arm: Simplify SMCCC handling by reusing __declare_arg_$()

[patchbot@xxxxxxx]

commit cd9cd05b2eba6a93fb7dc3d1bd1fe7a21426fd79
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Tue Feb 24 12:11:02 2026 +0000
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Wed Feb 25 13:06:55 2026 +0000

    xen/arm: Simplify SMCCC handling by reusing __declare_arg_$()
    
    Now that the type handling is entirely uniform, it's easier to see that
    __declare_arg_3() can use __declare_arg_2() and so on, just like the larger
    __declare_arg_$()'s already do.
    
    No functional change.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Michal Orzel <michal.orzel@xxxxxxx>
---
 xen/arch/arm/include/asm/smccc.h | 15 +++------------
 1 file changed, 3 insertions(+), 12 deletions(-)

diff --git a/xen/arch/arm/include/asm/smccc.h b/xen/arch/arm/include/asm/smccc.h
index 5b30dd57b6..590daf7b27 100644
--- a/xen/arch/arm/include/asm/smccc.h
+++ b/xen/arch/arm/include/asm/smccc.h
@@ -114,26 +114,17 @@ struct arm_smccc_res {
 
 #define __declare_arg_1(a0, a1, res)                        \
     typeof(a1) __a1 = (a1);                                 \
-    struct arm_smccc_res    *___res = (res);                \
-    register unsigned long  arg0 ASM_REG(0) = (uint32_t)(a0);\
+    __declare_arg_0(a0, res);                               \
     register typeof(a1)     arg1 ASM_REG(1) = __a1
 
 #define __declare_arg_2(a0, a1, a2, res)                    \
-    typeof(a1) __a1 = (a1);                                 \
     typeof(a2) __a2 = (a2);                                 \
-    struct arm_smccc_res    *___res = (res);                \
-    register unsigned long  arg0 ASM_REG(0) = (uint32_t)(a0);\
-    register typeof(a1)     arg1 ASM_REG(1) = __a1;         \
+    __declare_arg_1(a0, a1, res);                           \
     register typeof(a2)     arg2 ASM_REG(2) = __a2
 
 #define __declare_arg_3(a0, a1, a2, a3, res)                \
-    typeof(a1) __a1 = (a1);                                 \
-    typeof(a2) __a2 = (a2);                                 \
     typeof(a3) __a3 = (a3);                                 \
-    struct arm_smccc_res    *___res = (res);                \
-    register unsigned long  arg0 ASM_REG(0) = (uint32_t)(a0);\
-    register typeof(a1)     arg1 ASM_REG(1) = __a1;         \
-    register typeof(a2)     arg2 ASM_REG(2) = __a2;         \
+    __declare_arg_2(a0, a1, a2, res);                       \
     register typeof(a3)     arg3 ASM_REG(3) = __a3
 
 #define __declare_arg_4(a0, a1, a2, a3, a4, res)        \
--
generated by git-patchbot for /home/xen/git/xen.git#staging