[XEN PATCH 3/4] xen/include: add pure and const attributes

[Simone Ballarin <simone.ballarin@xxxxxxxxxxx>]

Add const and pure attributes to address reports
of MISRA C:2012 Rule 13.1: Initializer lists shall
not contain persistent side effects

Add pure attribute to function pdx_to_pfn.
Add const attribute to functions generated by TYPE_SAFE.

These functions are used in initializer lists: adding
the attributes ensures that no effect will be performed
by them.

Signed-off-by: Simone Ballarin <simone.ballarin@xxxxxxxxxxx>

---
Function attributes pure and const do not need to be added as GCC
attributes, they can be added using ECLAIR configurations.
---
 xen/include/xen/pdx.h      | 2 +-
 xen/include/xen/typesafe.h | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/xen/include/xen/pdx.h b/xen/include/xen/pdx.h
index f3fbc4273a..5d1050967a 100644
--- a/xen/include/xen/pdx.h
+++ b/xen/include/xen/pdx.h
@@ -164,7 +164,7 @@ static inline unsigned long pfn_to_pdx(unsigned long pfn)
  * @param pdx Page index
  * @return Obtained pfn after decompressing the pdx
  */
-static inline unsigned long pdx_to_pfn(unsigned long pdx)
+static inline __attribute_pure__ unsigned long pdx_to_pfn(unsigned long pdx)
 {
     return (pdx & pfn_pdx_bottom_mask) |
            ((pdx << pfn_pdx_hole_shift) & pfn_top_mask);
diff --git a/xen/include/xen/typesafe.h b/xen/include/xen/typesafe.h
index 7ecd3b4a8d..615df6f944 100644
--- a/xen/include/xen/typesafe.h
+++ b/xen/include/xen/typesafe.h
@@ -21,8 +21,8 @@
 
 #define TYPE_SAFE(_type, _name)                                         \
     typedef struct { _type _name; } _name##_t;                          \
-    static inline _name##_t _##_name(_type n) { return (_name##_t) { n }; } \
-    static inline _type _name##_x(_name##_t n) { return n._name; }
+    static inline __attribute_const__ _name##_t _##_name(_type n) { return 
(_name##_t) { n }; } \
+    static inline __attribute_const__ _type _name##_x(_name##_t n) { return 
n._name; }
 
 #else
 
-- 
2.34.1