[PATCH v3 07/10] xen: arm: fix is_xen_fixed_mfn

[Ian Campbell <ian.campbell@citrix.com>]

The current implementation is nonsense since the xenheap and the xen
text/data/etc mappings are nowhere near each other.

This is only actually used by the page offlining code, which isn't active on
ARM.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
 xen/include/asm-arm/mm.h |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/xen/include/asm-arm/mm.h b/xen/include/asm-arm/mm.h
index 5e7c5a3..baaf9c3 100644
--- a/xen/include/asm-arm/mm.h
+++ b/xen/include/asm-arm/mm.h
@@ -123,7 +123,9 @@ extern unsigned long xenheap_virt_end;
     unsigned long _mfn = (mfn);                                 \
     (_mfn >= xenheap_mfn_start && _mfn < xenheap_mfn_end);      \
 })
-#define is_xen_fixed_mfn(mfn) is_xen_heap_mfn(mfn)
+#define is_xen_fixed_mfn(mfn)                                   \
+    ((((mfn) << PAGE_SHIFT) >= virt_to_maddr(&_start)) &&       \
+     (((mfn) << PAGE_SHIFT) <= virt_to_maddr(&_end)))
 
 #define page_get_owner(_p)    (_p)->v.inuse.domain
 #define page_set_owner(_p,_d) ((_p)->v.inuse.domain = (_d))
-- 
1.7.2.5