linux-kernel - [PATCH v4 11/14] of: reserved-memory: Warn for missing static reserved memory regions

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Message-Id: <20250109-of_core_fix-v4-11-db8a72415b8c@quicinc.com>
Date: Thu, 09 Jan 2025 21:27:02 +0800
From: Zijun Hu <zijun_hu@...oud.com>
To: Rob Herring <robh@...nel.org>, Saravana Kannan <saravanak@...gle.com>, 
 Maxime Ripard <mripard@...nel.org>, Robin Murphy <robin.murphy@....com>, 
 Grant Likely <grant.likely@...retlab.ca>, Marc Zyngier <maz@...nel.org>, 
 Andreas Herrmann <andreas.herrmann@...xeda.com>, 
 Marek Szyprowski <m.szyprowski@...sung.com>, 
 Catalin Marinas <catalin.marinas@....com>, Mike Rapoport <rppt@...nel.org>, 
 Oreoluwa Babatunde <quic_obabatun@...cinc.com>
Cc: Zijun Hu <zijun_hu@...oud.com>, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Zijun Hu <quic_zijuhu@...cinc.com>, 
 stable@...r.kernel.org
Subject: [PATCH v4 11/14] of: reserved-memory: Warn for missing static
 reserved memory regions

From: Zijun Hu <quic_zijuhu@...cinc.com>

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.

Give warning message when missing remaining regions.

Fixes: 8a6e02d0c00e ("of: reserved_mem: Restructure how the reserved memory regions are processed")
Cc: stable@...r.kernel.org
Signed-off-by: Zijun Hu <quic_zijuhu@...cinc.com>
---
 drivers/of/of_reserved_mem.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
index 03a8f03ed1da165d6d7bf907d931857260888225..e2da88d7706ab3c208386e29f31350178e67cd14 100644
--- a/drivers/of/of_reserved_mem.c
+++ b/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);
 

-- 
2.34.1