linux-kernel - [PATCH v2 1/1] of: fdt: Scan /memreserve/ last

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Date:   Mon, 10 Apr 2023 08:00:17 -0400
From:   Lucas Tanure <tanure@...ux.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Mike Rapoport <rppt@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, jbrunet@...libre.com,
        linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        martin.blumenstingl@...glemail.com, narmstrong@...libre.com,
        stefan@...er.ch, Lucas Tanure <tanure@...ux.com>
Subject: [PATCH v2 1/1] of: fdt: Scan /memreserve/ last

Change the order of scanning /memreserve/ and /reserved-memory node.
/reserved-memory node should go first, as it has a more updated
description of the memory regions and it can apply flags, like nomap.
Also, /memreserve/ should avoid reserving regions described in
/reserved-memory node.

Signed-off-by: Lucas Tanure <tanure@...ux.com>
---
 drivers/of/fdt.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index d1a68b6d03b3..26e608d8025d 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -635,16 +635,21 @@ void __init early_init_fdt_scan_reserved_mem(void)
 	if (!initial_boot_params)
 		return;
 
+	fdt_scan_reserved_mem();
+	fdt_reserve_elfcorehdr();
+
 	/* Process header /memreserve/ fields */
 	for (n = 0; ; n++) {
 		fdt_get_mem_rsv(initial_boot_params, n, &base, &size);
 		if (!size)
 			break;
+		if (memblock_overlaps_region(&memblock.memory, base, size) &&
+		    memblock_is_region_reserved(base, size))
+			break;
+
 		memblock_reserve(base, size);
 	}
 
-	fdt_scan_reserved_mem();
-	fdt_reserve_elfcorehdr();
 	fdt_init_reserved_mem();
 }
 
-- 
2.40.0