x86/amd: address violations of MISRA C Rule 20.7

MISRA C Rule 20.7 states: "Expressions resulting from the expansion
of macro parameters shall be enclosed in parentheses". Therefore, some
macro definitions should gain additional parentheses to ensure that all
current and future users will be safe with respect to expansions that
can possibly alter the semantics of the passed-in macro parameter.

No functional change.

Signed-off-by: Nicola Vetrini <nicola.vetrini@bugseng.com>
Acked-by: Jan Beulich <jbeulich@suse.com>

xen/arch/x86/include/asm/amd.h

@@ -119,7 +119,8 @@
 #define AMD_LEGACY_ERRATUM(...)         -1 /* legacy */, __VA_ARGS__, 0
 #define AMD_OSVW_ERRATUM(osvw_id, ...)  osvw_id, __VA_ARGS__, 0
 #define AMD_MODEL_RANGE(f, m_start, s_start, m_end, s_end)              \
-    ((f << 24) | (m_start << 16) | (s_start << 12) | (m_end << 4) | (s_end))
+    (((f) << 24) | ((m_start) << 16) | ((s_start) << 12) | \
+     ((m_end) << 4) | (s_end))
 #define AMD_MODEL_RANGE_FAMILY(range)   (((range) >> 24) & 0xff)
 #define AMD_MODEL_RANGE_START(range)    (((range) >> 12) & 0xfff)
 #define AMD_MODEL_RANGE_END(range)      ((range) & 0xfff)