[XEN PATCH v2 for-4.20 5/7] x86/irq: address violations 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>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
Note that the rule does not apply to f because that parameter
is not used as an expression in the macro, but rather as an identifier.
---
 xen/include/xen/irq.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/include/xen/irq.h b/xen/include/xen/irq.h
index 580ae37e7428..17211f3399b7 100644
--- a/xen/include/xen/irq.h
+++ b/xen/include/xen/irq.h
@@ -178,7 +178,7 @@ extern struct pirq *pirq_get_info(struct domain *d, int 
pirq);
 
 #define pirq_field(d, p, f, def) ({ \
     const struct pirq *__pi = pirq_info(d, p); \
-    __pi ? __pi->f : def; \
+    __pi ? __pi->f : (def); \
 })
 #define pirq_to_evtchn(d, pirq) pirq_field(d, pirq, evtchn, 0)
 #define pirq_masked(d, pirq) pirq_field(d, pirq, masked, 0)
-- 
2.34.1