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

[Lucas Tanure]

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 at linux.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