[Xen-devel] [PATCH v4 05/16] xen/mm: Introduce INVALID_GFN_T and INVALID_MFN_T

[Julien Grall <julien.grall@xxxxxxx>]

The two new defines will be a typesafe version of resp. INVALID_GFN and
INVALID_MFN.

Signed-off-by: Julien Grall <julien.grall@xxxxxxx>

---
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Cc: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Cc: Tim Deegan <tim@xxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>

    Changes in v4:
        - Patch added
---
 xen/include/xen/mm.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/xen/include/xen/mm.h b/xen/include/xen/mm.h
index afbb1a1..978a62e 100644
--- a/xen/include/xen/mm.h
+++ b/xen/include/xen/mm.h
@@ -56,6 +56,7 @@
 TYPE_SAFE(unsigned long, mfn);
 #define PRI_mfn          "05lx"
 #define INVALID_MFN      (~0UL)
+#define INVALID_MFN_T    _mfn(INVALID_MFN)
 
 #ifndef mfn_t
 #define mfn_t /* Grep fodder: mfn_t, _mfn() and mfn_x() are defined above */
@@ -85,6 +86,7 @@ static inline bool_t mfn_eq(mfn_t x, mfn_t y)
 TYPE_SAFE(unsigned long, gfn);
 #define PRI_gfn          "05lx"
 #define INVALID_GFN      (~0UL)
+#define INVALID_GFN_T    _gfn(INVALID_GFN)
 
 #ifndef gfn_t
 #define gfn_t /* Grep fodder: gfn_t, _gfn() and gfn_x() are defined above */
-- 
1.9.1


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