of: reserved-memory: Warn for missing static reserved memory regions

commit 81dfedd523 upstream.

For child node of /reserved-memory, its property 'reg' may contain
multiple regions, but fdt_scan_reserved_mem_reg_nodes() only takes
into account the first region, and miss remaining regions.

But there are no simple approach to fix it, so give user warning
message when miss remaining regions.

Fixes: 8a6e02d0c0 ("of: reserved_mem: Restructure how the reserved memory regions are processed")
Cc: stable@vger.kernel.org
Signed-off-by: Zijun Hu <quic_zijuhu@quicinc.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20250114-of_core_fix-v5-2-b8bafd00a86f@quicinc.com
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/of/of_reserved_mem.c

@@ -214,6 +214,11 @@ void __init fdt_scan_reserved_mem_reg_nodes(void)
 			       uname);
 			continue;
 		}
+
+		if (len > t_len)
+			pr_warn("%s() ignores %d regions in node '%s'\n",
+				__func__, len / t_len - 1, uname);
+
 		base = dt_mem_next_cell(dt_root_addr_cells, &prop);
 		size = dt_mem_next_cell(dt_root_size_cells, &prop);