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

JIRA: https://issues.redhat.com/browse/RHEL-125402

commit 81dfedd
Author: Zijun Hu <quic_zijuhu@quicinc.com>
Date:   2025-01-14 23:23:04 +0800

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

    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: 8a6e02d ("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: Maxime Ripard <mripard@redhat.com>

Author: Maxime Ripard

drivers/of/of_reserved_mem.c

@@ -263,6 +263,11 @@ 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);