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charset="utf-8" This using a GNU extension, it may not be exposed in general, just like is done on x86. External consumers need to make this type available up front (just like we expect {,u}int_t to be supplied) - unlike on x86 the type is actually needed outside of tools-only interfaces, because guest handle definitions use it. While there also add underscores around "aligned". Signed-off-by: Jan Beulich Reviewed-by: Bertrand Marquis --- a/xen/include/public/arch-arm.h +++ b/xen/include/public/arch-arm.h @@ -152,8 +152,10 @@ =20 #define XEN_HYPERCALL_TAG 0XEA1 =20 -#define int64_aligned_t int64_t __attribute__((aligned(8))) -#define uint64_aligned_t uint64_t __attribute__((aligned(8))) +#if defined(__XEN__) || defined(__XEN_TOOLS__) +#define int64_aligned_t int64_t __attribute__((__aligned__(8))) +#define uint64_aligned_t uint64_t __attribute__((__aligned__(8))) +#endif =20 #ifndef __ASSEMBLY__ #define ___DEFINE_XEN_GUEST_HANDLE(name, type) \