[PATCH v2 1/2] mm: introduce INVALID_{G,M}FN_RAW

[Jan Beulich <jbeulich@xxxxxxxx>]

This allows properly tying together INVALID_{G,M}FN and
INVALID_{G,M}FN_INITIALIZER as well as using the actual values in
compile time constant expressions (or even preprocessor dirctives).

Since INVALID_PFN is unused, and with x86'es paging_mark_pfn_dirty()
being the only user of pfn_t it also doesn't seem likely that new uses
would appear, remove that one at this same occasion.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
v2: New.

--- a/xen/include/xen/mm-frame.h
+++ b/xen/include/xen/mm-frame.h
@@ -6,12 +6,13 @@
 
 TYPE_SAFE(unsigned long, mfn);
 #define PRI_mfn          "05lx"
-#define INVALID_MFN      _mfn(~0UL)
+#define INVALID_MFN_RAW  (~0UL)
+#define INVALID_MFN      _mfn(INVALID_MFN_RAW)
 /*
  * To be used for global variable initialization. This workaround a bug
  * in GCC < 5.0.
  */
-#define INVALID_MFN_INITIALIZER { ~0UL }
+#define INVALID_MFN_INITIALIZER { INVALID_MFN_RAW }
 
 #ifndef mfn_t
 #define mfn_t /* Grep fodder: mfn_t, _mfn() and mfn_x() are defined above */
@@ -44,12 +45,13 @@ static inline bool_t mfn_eq(mfn_t x, mfn
 
 TYPE_SAFE(unsigned long, gfn);
 #define PRI_gfn          "05lx"
-#define INVALID_GFN      _gfn(~0UL)
+#define INVALID_GFN_RAW  (~0UL)
+#define INVALID_GFN      _gfn(INVALID_GFN_RAW)
 /*
  * To be used for global variable initialization. This workaround a bug
  * in GCC < 5.0 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64856
  */
-#define INVALID_GFN_INITIALIZER { ~0UL }
+#define INVALID_GFN_INITIALIZER { INVALID_GFN_RAW }
 
 #ifndef gfn_t
 #define gfn_t /* Grep fodder: gfn_t, _gfn() and gfn_x() are defined above */
@@ -82,7 +84,6 @@ static inline bool_t gfn_eq(gfn_t x, gfn
 
 TYPE_SAFE(unsigned long, pfn);
 #define PRI_pfn          "05lx"
-#define INVALID_PFN      (~0UL)
 
 #ifndef pfn_t
 #define pfn_t /* Grep fodder: pfn_t, _pfn() and pfn_x() are defined above */