[XEN PATCH v2 3/3] xen/pci: 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>
---
 xen/include/xen/pci_regs.h | 6 +++---
 xen/include/xen/vpci.h     | 2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/xen/include/xen/pci_regs.h b/xen/include/xen/pci_regs.h
index 9909b27425a5..0bc18efabb74 100644
--- a/xen/include/xen/pci_regs.h
+++ b/xen/include/xen/pci_regs.h
@@ -445,9 +445,9 @@
 #define PCI_EXP_RTSTA          32      /* Root Status */
 
 /* Extended Capabilities (PCI-X 2.0 and Express) */
-#define PCI_EXT_CAP_ID(header)         (header & 0x0000ffff)
-#define PCI_EXT_CAP_VER(header)                ((header >> 16) & 0xf)
-#define PCI_EXT_CAP_NEXT(header)       ((header >> 20) & 0xffc)
+#define PCI_EXT_CAP_ID(header)         ((header) & 0x0000ffff)
+#define PCI_EXT_CAP_VER(header)                (((header) >> 16) & 0xf)
+#define PCI_EXT_CAP_NEXT(header)       (((header) >> 20) & 0xffc)
 
 #define PCI_EXT_CAP_ID_ERR     1
 #define PCI_EXT_CAP_ID_VC      2
diff --git a/xen/include/xen/vpci.h b/xen/include/xen/vpci.h
index e89c571890b2..6e4c972f35ed 100644
--- a/xen/include/xen/vpci.h
+++ b/xen/include/xen/vpci.h
@@ -23,7 +23,7 @@ typedef int vpci_register_init_t(struct pci_dev *dev);
 
 #define REGISTER_VPCI_INIT(x, p)                \
   static vpci_register_init_t *const x##_entry  \
-               __used_section(".data.vpci." p) = x
+               __used_section(".data.vpci." p) = (x)
 
 /* Assign vPCI to device by adding handlers. */
 int __must_check vpci_assign_device(struct pci_dev *pdev);
-- 
2.34.1