[Xen-devel] [PATCH] xen/arm: Don't call init_domheap_page with an empty range

[Julien Grall <julien.grall@xxxxxxxxxx>]

When an initrd is given to xen by U-boot, it will reserve the memory in
the device tree.
In this case, when xen decides to free unused memory, dt_unreserved_regions
will call init_domheap_page with the start and the end of range equals. But
the latter assumes that (start > end), if not Xen will hang because the
number of pages is equals to (unsigned)-1.

Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
---
 xen/arch/arm/setup.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
index 1081b43..5794a03 100644
--- a/xen/arch/arm/setup.c
+++ b/xen/arch/arm/setup.c
@@ -173,7 +173,8 @@ static void dt_unreserved_regions(paddr_t s, paddr_t e,
         }
     }
 
-    cb(s, e);
+    if ( s != e )
+        cb(s, e);
 }
 
 void __init discard_initial_modules(void)
-- 
1.8.3.1


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