[Xen-devel] [PATCH 04/11] Disable the mfn_is_ram() check, it doesn't work correctly on all systems

[Matthew Fioravante <matthew.fioravante@xxxxxxxxxx>]

This patch disables the mfn_is_ram check in mini-os. The current check
is insufficient and fails on some systems with larger than 4gb memory.

Signed-off-by: Matthew Fioravante <matthew.fioravante@xxxxxxxxxx>
Acked-by: Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>

diff --git a/extras/mini-os/arch/x86/mm.c b/extras/mini-os/arch/x86/mm.c
index 80aceac..5813a08 100644
--- a/extras/mini-os/arch/x86/mm.c
+++ b/extras/mini-os/arch/x86/mm.c
@@ -850,6 +850,8 @@ unsigned long alloc_contig_pages(int order, unsigned int 
addr_bits)
 static long system_ram_end_mfn;
 int mfn_is_ram(unsigned long mfn)
 {
+   /* This is broken on systems with large ammounts of ram. Always return 0 
for now */
+    return 0;
     /* very crude check if a given MFN is memory or not. Probably should
      * make this a little more sophisticated ;) */
     return (mfn <= system_ram_end_mfn) ? 1 : 0;
-- 
1.7.9.5


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