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.
Add an '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_prokopch...@epam.com>
---
 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
-- 
2.43.0

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