[xen master] iommu: address violation of MISRA C Rule 5.5

[patchbot@xxxxxxx]

commit b2d78fab9f9619ced6420d301ba0f51ec7d40b1a
Author:     Dmytro Prokopchuk <dmytro_prokopchuk1@xxxxxxxx>
AuthorDate: Thu Jul 10 13:42:10 2025 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Jul 10 13:42:10 2025 +0200

    iommu: address violation of MISRA C Rule 5.5
    
    Address a violation of MISRA C:2012 Rule 5.5:
    "Identifiers shall be distinct from macro names".
    
    Reports for service MC3A2.R5.5:
    xen/drivers/passthrough/iommu.c: non-compliant macro 'iommu_quarantine'
    xen/include/xen/iommu.h: non-compliant variable 'iommu_quarantine'
    
    There is a clash between function name and macro.
    Put the 'extern' declaration for 'iommu_quarantine'
    under the same preprocessor condition (#ifdef CONFIG_HAS_PCI).
    This ensures that the declaration is consistent
    and only exposed when CONFIG_HAS_PCI is defined.
    
    Signed-off-by: Dmytro Prokopchuk <dmytro_prokopchuk1@xxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/include/xen/iommu.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/xen/include/xen/iommu.h b/xen/include/xen/iommu.h
index 3205e49990..57f338e2a0 100644
--- a/xen/include/xen/iommu.h
+++ b/xen/include/xen/iommu.h
@@ -53,7 +53,9 @@ static inline bool dfn_eq(dfn_t x, dfn_t y)
 extern bool iommu_enable, iommu_enabled;
 extern bool force_iommu, iommu_verbose;
 /* Boolean except for the specific purposes of drivers/passthrough/iommu.c. */
+#ifdef CONFIG_HAS_PCI
 extern uint8_t iommu_quarantine;
+#endif /* CONFIG_HAS_PCI */
 #else
 #define iommu_enabled false
 #endif
--
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