have mapdev() panic if size == 0 to be safe (catches config errors)

diff --git a/sys/arch/sparc/sparc/machdep.c b/sys/arch/sparc/sparc/machdep.c
index b07e611..9529ea3 100644 (file)
--- a/sys/arch/sparc/sparc/machdep.c
+++ b/sys/arch/sparc/sparc/machdep.c
@@ -873,6 +873,8 @@ mapdev(rr, virt, offset, size, bustype)
                iobase = IODEV_BASE;
 
        size = round_page(size);
+       if (size == 0) panic("mapdev: zero size");
+
        if (virt)
                v = trunc_page(virt);
        else {