[XEN PATCH] xen/compiler: deviate the inline macro for MISRA C Rule 20.4

[Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>]

Rule 20.4 states: "A macro shall not be defined with the same name
as a keyword".

Defining this macro with the same name as the inline keyword
allows for additionally checking that out-of-lined static inline
functions end up in the correct section while minimizing churn and
has a positive impact on the overall safety. See [1] for additional
context on the motivation of this deviation.

No functional change.

[1] 
https://lore.kernel.org/xen-devel/adaa6d55-266d-4df8-8967-9340080d17e4@xxxxxxxxxx/

Signed-off-by: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
---
 docs/misra/safe.json       | 8 ++++++++
 xen/include/xen/compiler.h | 1 +
 2 files changed, 9 insertions(+)

diff --git a/docs/misra/safe.json b/docs/misra/safe.json
index 952324f85cf9..a2bbacddf06a 100644
--- a/docs/misra/safe.json
+++ b/docs/misra/safe.json
@@ -28,6 +28,14 @@
         },
         {
             "id": "SAF-3-safe",
+            "analyser": {
+                "eclair": "MC3R1.R20.4"
+            },
+            "name": "MC3R1.R20.4: allow the augmentation of the inline keyword 
in some build configurations",
+            "text": "The definition of this macro named inline allows further 
checking in some build configurations that certain symbols end up in the right 
sections."
+        },
+        {
+            "id": "SAF-4-safe",
             "analyser": {},
             "name": "Sentinel",
             "text": "Next ID to be used"
diff --git a/xen/include/xen/compiler.h b/xen/include/xen/compiler.h
index 16d554f2a593..e3d9f9fb8e4b 100644
--- a/xen/include/xen/compiler.h
+++ b/xen/include/xen/compiler.h
@@ -82,6 +82,7 @@
  * inline functions not expanded inline get placed in .init.text.
  */
 #include <xen/init.h>
+/* SAF-3-safe MISRA C Rule 20.4: define the inline macro to perform checks */
 #define inline inline __init
 #endif
 
-- 
2.34.1