[Qemu-devel] [PATCH 2/2] pc-dimm: fix large address sorting during auto-allocation

[Igor Mammedov <imammedo@redhat.com>]

GCompareFunc(a, b) used by g_slist_insert_sorted() return 'gint',
however it might be too small to fit difference between
2 addresses. So use 128bit calculate difference and normalize
result to -1/0/1 return values.

Reported-By: Andrey Korolyov <andrey@xdel.ru>
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
 hw/mem/pc-dimm.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/hw/mem/pc-dimm.c b/hw/mem/pc-dimm.c
index 9f091c6..8c26568 100644
--- a/hw/mem/pc-dimm.c
+++ b/hw/mem/pc-dimm.c
@@ -73,8 +73,14 @@ static gint pc_dimm_addr_sort(gconstpointer a, gconstpointer b)
 {
     PCDIMMDevice *x = PC_DIMM(a);
     PCDIMMDevice *y = PC_DIMM(b);
+    Int128 diff = int128_sub(int128_make64(x->addr), int128_make64(y->addr));
 
-    return x->addr - y->addr;
+    if (int128_lt(diff, int128_zero())) {
+        return -1;
+    } else if (int128_gt(diff, int128_zero())) {
+        return 1;
+    }
+    return 0;
 }
 
 static int pc_dimm_built_list(Object *obj, void *opaque)
-- 
1.9.3