[PATCH 1/3] common/kernel: address violation of MISRA C Rule 13.6

[Alessandro Zucchelli <alessandro.zucchelli@xxxxxxxxxxx>]

In the file common/kernel.c macro ARRAY_SIZE is called with argument
current->domain->handle.
Once expanded, this ARRAY_SIZE's argument is used in sizeof operations
and thus 'current', being a macro that expands to a function
call with potential side effects, generates a violation.

To address this violation the value of current->domain is therefore
stored in a variable called 'd' before passing it to macro ARRAY_SIZE.

No functional change.

Signed-off-by: Alessandro Zucchelli <alessandro.zucchelli@xxxxxxxxxxx>
---
 xen/common/kernel.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/xen/common/kernel.c b/xen/common/kernel.c
index b44b2439ca..76b4f27aef 100644
--- a/xen/common/kernel.c
+++ b/xen/common/kernel.c
@@ -660,14 +660,15 @@ long do_xen_version(int cmd, XEN_GUEST_HANDLE_PARAM(void) 
arg)
 
     case XENVER_guest_handle:
     {
+        struct domain *d = current->domain;
         xen_domain_handle_t hdl;
 
         if ( deny )
             memset(&hdl, 0, ARRAY_SIZE(hdl));
 
-        BUILD_BUG_ON(ARRAY_SIZE(current->domain->handle) != ARRAY_SIZE(hdl));
+        BUILD_BUG_ON(ARRAY_SIZE(d->handle) != ARRAY_SIZE(hdl));
 
-        if ( copy_to_guest(arg, deny ? hdl : current->domain->handle,
+        if ( copy_to_guest(arg, deny ? hdl : d->handle,
                            ARRAY_SIZE(hdl) ) )
             return -EFAULT;
         return 0;
-- 
2.34.1