[XEN PATCH v2 6/7] x86/irq: parenthesize negative constants

[Nicola Vetrini <nicola.vetrini@bugseng.com>]

These constants are parenthesized to avoid them from
possibly influencing the semantics of the constructs where it is used,
especially inside macros invocations.

This also resolves some violations of MISRA C Rule 20.7
("Expressions resulting from the expansion of macro parameters shall
be enclosed in parentheses").

No functional change.

Signed-off-by: Nicola Vetrini <nicola.vetrini@bugseng.com>
---
Changes in v2:
- dropped the controversial GUARD(1) hunk
---
 xen/arch/x86/include/asm/irq.h | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/xen/arch/x86/include/asm/irq.h b/xen/arch/x86/include/asm/irq.h
index 082a3d6bbc6a..7d49f3c1904a 100644
--- a/xen/arch/x86/include/asm/irq.h
+++ b/xen/arch/x86/include/asm/irq.h
@@ -172,16 +172,16 @@ void cleanup_domain_irq_mapping(struct domain *d);
     void *__ret = radix_tree_lookup(&(d)->arch.irq_pirq, irq);  \
     __ret ? radix_tree_ptr_to_int(__ret) : 0;                   \
 })
-#define PIRQ_ALLOCATED -1
+#define PIRQ_ALLOCATED (-1)
 #define domain_pirq_to_emuirq(d, pirq) pirq_field(d, pirq,              \
     arch.hvm.emuirq, IRQ_UNBOUND)
 #define domain_emuirq_to_pirq(d, emuirq) ({                             \
     void *__ret = radix_tree_lookup(&(d)->arch.hvm.emuirq_pirq, emuirq);\
     __ret ? radix_tree_ptr_to_int(__ret) : IRQ_UNBOUND;                 \
 })
-#define IRQ_UNBOUND -1
-#define IRQ_PT -2
-#define IRQ_MSI_EMU -3
+#define IRQ_UNBOUND (-1)
+#define IRQ_PT      (-2)
+#define IRQ_MSI_EMU (-3)
 
 bool cpu_has_pending_apic_eoi(void);
 
-- 
2.34.1