[xen staging] xen/pci: address violations of MISRA C Rule 20.7

[patchbot@xxxxxxx]

commit 14424d90e1ca432eceafafac603ea8e9cfb84dd3
Author:     Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
AuthorDate: Tue Apr 30 16:28:16 2024 +0200
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Thu May 9 18:19:49 2024 +0100

    xen/pci: address violations of MISRA C Rule 20.7
    
    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>
---
 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 9909b27425..0bc18efabb 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 e89c571890..6e4c972f35 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);
--
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