[XEN PATCH v2 2/3] xen/unaligned: address violation of MISRA C Rule 20.7

[Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>]

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@xxxxxxxxxxx>
---
Somewhat surprisingly, the change in the tools directory is also needed, 
otherwise
some CI build jobs fail (see e.g. [1]). This is not undefined behaviour
as long as the two definitions are kept in sync, following section
6.10.3p2 of the C99 standard, but having the definition in common-macros.h
is still a potential problem.

[1] https://gitlab.com/xen-project/people/bugseng/xen/-/jobs/6742878558
---
 tools/include/xen-tools/common-macros.h | 2 +-
 xen/include/xen/unaligned.h             | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/include/xen-tools/common-macros.h 
b/tools/include/xen-tools/common-macros.h
index 07aed92684b5..60912225cb7a 100644
--- a/tools/include/xen-tools/common-macros.h
+++ b/tools/include/xen-tools/common-macros.h
@@ -102,7 +102,7 @@
 
 #define put_unaligned_t(type, val, ptr) do {                        \
     struct { type x; } __packed *ptr_ = (typeof(ptr_))(ptr);        \
-    ptr_->x = val;                                                  \
+    ptr_->x = (val);                                                \
 } while (0)
 
 #define get_unaligned(ptr)      get_unaligned_t(typeof(*(ptr)), ptr)
diff --git a/xen/include/xen/unaligned.h b/xen/include/xen/unaligned.h
index 3eda0ece1199..2e8238d45c54 100644
--- a/xen/include/xen/unaligned.h
+++ b/xen/include/xen/unaligned.h
@@ -19,7 +19,7 @@
 
 #define put_unaligned_t(type, val, ptr) do {                           \
        struct { type x; } __packed *ptr_ = (typeof(ptr_))(ptr);        \
-       ptr_->x = val;                                                  \
+       ptr_->x = (val);                                                        
\
 } while (0)
 
 #define get_unaligned(ptr)     get_unaligned_t(typeof(*(ptr)), ptr)
-- 
2.34.1