[PATCH 01/17] misra: add deviation for headers that explicitly avoid guards

[Alessandro Zucchelli <alessandro.zucchelli@xxxxxxxxxxx>]

From: Simone Ballarin <simone.ballarin@xxxxxxxxxxx>

Some headers, under specific circumstances (documented in a comment at
the beginning of the file), explicitly avoid inclusion guards: the caller
is responsible for including them correctly.

These files are not supposed to comply with Directive 4.10:
"Precautions shall be taken in order to prevent the contents of a header
file being included more than once"

This patch adds deviation cooments for headers that avoid guards.

Signed-off-by: Simone Ballarin <simone.ballarin@xxxxxxxxxxx>
Signed-off-by: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
Signed-off-by: Alessandro Zucchelli <alessandro.zucchelli@xxxxxxxxxxx>

---
Changes in v4:
- rebased against current staging tree
Changes in v3:
- fix inconsistent deviation ID
- change comment-based deviation text
Changes in v2:
- use the format introduced with doc/misra/safe.json instead of
  a generic text-based deviation
---
 docs/misra/safe.json                        | 8 ++++++++
 xen/include/public/arch-x86/cpufeatureset.h | 1 +
 xen/include/public/errno.h                  | 1 +
 3 files changed, 10 insertions(+)

diff --git a/docs/misra/safe.json b/docs/misra/safe.json
index 3f18ef401c..b865caac73 100644
--- a/docs/misra/safe.json
+++ b/docs/misra/safe.json
@@ -68,6 +68,14 @@
         },
         {
             "id": "SAF-8-safe",
+            "analyser": {
+                "eclair": "MC3R1.D4.10"
+            },
+            "name": "Dir 4.10: headers that leave it up to the caller to 
include them correctly",
+            "text": "Headers that deliberatively avoid inclusion guards 
explicitly leaving responsibility to the caller are allowed."
+        },
+        {
+            "id": "SAF-9-safe",
             "analyser": {},
             "name": "Sentinel",
             "text": "Next ID to be used"
diff --git a/xen/include/public/arch-x86/cpufeatureset.h 
b/xen/include/public/arch-x86/cpufeatureset.h
index d9eba5e9a7..0d2adfdc3a 100644
--- a/xen/include/public/arch-x86/cpufeatureset.h
+++ b/xen/include/public/arch-x86/cpufeatureset.h
@@ -23,6 +23,7 @@
  * their XEN_CPUFEATURE() being appropriate in the included context.
  */
 
+/* SAF-8-safe omitted inclusion guard */
 #ifndef XEN_CPUFEATURE
 
 /*
diff --git a/xen/include/public/errno.h b/xen/include/public/errno.h
index 5a78a7607c..ccd5023c3a 100644
--- a/xen/include/public/errno.h
+++ b/xen/include/public/errno.h
@@ -17,6 +17,7 @@
  * will unilaterally #undef XEN_ERRNO().
  */
 
+/* SAF-8-safe omitted inclusion guard */
 #ifndef XEN_ERRNO
 
 /*
-- 
2.34.1