[xen staging] x86: have cmpxchg16b() obey to Misra rule 11.8

[patchbot@xxxxxxx]

commit d9e225afe68d3714e8d48422d85186bc06442046
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Tue Oct 6 08:13:39 2026 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Oct 6 08:13:39 2026 +0200

    x86: have cmpxchg16b() obey to Misra rule 11.8
    
    Casting away const-ness (or volatile-ness) is never a good idea, and
    there's no need to in cmpxchg16b().
    
    No functional change intended.
    
    Fixes: e0116acbbd0b ("x86: add cmpxchg16b support")
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/include/asm/x86_64/system.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/x86/include/asm/x86_64/system.h 
b/xen/arch/x86/include/asm/x86_64/system.h
index e94371cf20..1eb115370e 100644
--- a/xen/arch/x86/include/asm/x86_64/system.h
+++ b/xen/arch/x86/include/asm/x86_64/system.h
@@ -56,7 +56,7 @@ static always_inline __uint128_t cmpxchg16b_local_(
     ASSERT(!((unsigned long)_p & 0xf));                    \
     BUILD_BUG_ON(sizeof(*(o)) != sizeof(__uint128_t));     \
     BUILD_BUG_ON(sizeof(*(n)) != sizeof(__uint128_t));     \
-    __cmpxchg16b(_p, (void *)(o), (void *)(n));            \
+    __cmpxchg16b(_p, (const void *)(o), (const void *)(n));\
 })
 
 #endif /* __X86_64_SYSTEM_H__ */
--
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