[RFC PATCH 4/4] xen: Justify linker script defined symbols in include/xen/kernel.h

[Luca Fancellu <luca.fancellu@xxxxxxx>]

Eclair and Coverity found violation of the MISRA rule 8.6 for the
symbols _start, _end, start, _stext, _etext, _srodata, _erodata,
_sinittext, _einittext which are declared in
xen/include/xen/kernel.h.
All those symbols are defined by the liker script so we can deviate
from the rule 8.6 for these cases.

Signed-off-by: Luca Fancellu <luca.fancellu@xxxxxxx>
---
 docs/misra/safe.json     | 9 +++++++++
 xen/include/xen/kernel.h | 4 ++++
 2 files changed, 13 insertions(+)

diff --git a/docs/misra/safe.json b/docs/misra/safe.json
index e079d3038120..e3c8a1d8eb36 100644
--- a/docs/misra/safe.json
+++ b/docs/misra/safe.json
@@ -3,6 +3,15 @@
     "content": [
         {
             "id": "SAF-0-safe",
+            "analyser": {
+                "eclair": "MC3R1.R8.6",
+                "coverity": "misra_c_2012_rule_8_6_violation"
+            },
+            "name": "Rule 8.6: linker script defined symbols",
+            "text": "It is safe to declare this symbol because it is defined 
in the linker script."
+        },
+        {
+            "id": "SAF-1-safe",
             "analyser": {},
             "name": "Sentinel",
             "text": "Next ID to be used"
diff --git a/xen/include/xen/kernel.h b/xen/include/xen/kernel.h
index 8cd142032d3b..efcd24b355d6 100644
--- a/xen/include/xen/kernel.h
+++ b/xen/include/xen/kernel.h
@@ -65,24 +65,28 @@
        1;                                      \
 })
 
+/* SAF-0-safe R8.6 linker script defined symbols */
 extern char _start[], _end[], start[];
 #define is_kernel(p) ({                         \
     char *__p = (char *)(unsigned long)(p);     \
     (__p >= _start) && (__p < _end);            \
 })
 
+/* SAF-0-safe R8.6 linker script defined symbols */
 extern char _stext[], _etext[];
 #define is_kernel_text(p) ({                    \
     char *__p = (char *)(unsigned long)(p);     \
     (__p >= _stext) && (__p < _etext);          \
 })
 
+/* SAF-0-safe R8.6 linker script defined symbols */
 extern const char _srodata[], _erodata[];
 #define is_kernel_rodata(p) ({                  \
     const char *__p = (const char *)(unsigned long)(p);     \
     (__p >= _srodata) && (__p < _erodata);      \
 })
 
+/* SAF-0-safe R8.6 linker script defined symbols */
 extern char _sinittext[], _einittext[];
 #define is_kernel_inittext(p) ({                \
     char *__p = (char *)(unsigned long)(p);     \
-- 
2.17.1