[xen staging] xen/riscv: allow write_atomic() to work with non-scalar types

[patchbot@xxxxxxx]

commit f9e69c266ee0b5d386126d3625b79326c8cab3b3
Author:     Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
AuthorDate: Mon Sep 30 10:06:44 2024 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Sep 30 10:06:44 2024 +0200

    xen/riscv: allow write_atomic() to work with non-scalar types
    
    Update the defintion of write_atomic() to support non-scalar types,
    bringing it closer to the behavior of read_atomic().
    
    Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/riscv/include/asm/atomic.h | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/xen/arch/riscv/include/asm/atomic.h 
b/xen/arch/riscv/include/asm/atomic.h
index 95910ebfeb..9669a3286d 100644
--- a/xen/arch/riscv/include/asm/atomic.h
+++ b/xen/arch/riscv/include/asm/atomic.h
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
+ /* SPDX-License-Identifier: GPL-2.0-only */
 /*
  * Taken and modified from Linux.
  *
@@ -69,10 +69,11 @@ static always_inline void _write_atomic(volatile void *p,
     }
 }
 
-#define write_atomic(p, x)                              \
-({                                                      \
-    typeof(*(p)) x_ = (x);                              \
-    _write_atomic(p, x_, sizeof(*(p)));                 \
+#define write_atomic(p, x)                                          \
+({                                                                  \
+    union { typeof(*(p)) v; unsigned long ul; } x_ = { .ul = 0UL }; \
+    x_.v = (x);                                                     \
+    _write_atomic(p, x_.ul, sizeof(*(p)));                          \
 })
 
 static always_inline void _add_sized(volatile void *p,
--
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