[XEN PATCH][for-4.19 v3 5/8] x86/io_apic: address violation of MISRA C:2012 Rule 10.1

[Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>]

The definition of IO_APIC_BASE contains a sum of an essentially enum
value (FIX_IO_APIC_BASE_0) that is positive with an index that, in all
instances, is unsigned, therefore the former is cast to unsigned, so that
the operands are of the same essential type.

No functional change.

Signed-off-by: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
---
Eventually __fix_to_virt may become an inline function; in that case,
it should retain unsigned int as its parameter type.

Changes in v3:
- style fix
- Add missing S-o-b
---
 xen/arch/x86/include/asm/io_apic.h | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/xen/arch/x86/include/asm/io_apic.h 
b/xen/arch/x86/include/asm/io_apic.h
index a7e4c9e146de..206bb961c005 100644
--- a/xen/arch/x86/include/asm/io_apic.h
+++ b/xen/arch/x86/include/asm/io_apic.h
@@ -14,9 +14,10 @@
  * Copyright (C) 1997, 1998, 1999, 2000 Ingo Molnar
  */
 
-#define IO_APIC_BASE(idx)                                               \
-    ((volatile uint32_t *)(__fix_to_virt(FIX_IO_APIC_BASE_0 + (idx))    \
-                           + (mp_ioapics[idx].mpc_apicaddr & ~PAGE_MASK)))
+#define IO_APIC_BASE(idx)                                         \
+    ((volatile uint32_t *)                                        \
+     (__fix_to_virt((unsigned int)FIX_IO_APIC_BASE_0 + (idx)) +   \
+                    (mp_ioapics[idx].mpc_apicaddr & ~PAGE_MASK)))
 
 #define IO_APIC_ID(idx) (mp_ioapics[idx].mpc_apicid)
 
-- 
2.34.1