linux-kernel - [PATCH 5.4 144/340] fdt: Properly handle "no-map" field in the memory region

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Message-Id: <20210301161055.404647962@linuxfoundation.org>
Date:   Mon,  1 Mar 2021 17:11:28 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        devicetree@...r.kernel.org, KarimAllah Ahmed <karahmed@...zon.de>,
        Quentin Perret <qperret@...gle.com>,
        Rob Herring <robh@...nel.org>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 144/340] fdt: Properly handle "no-map" field in the memory region

From: KarimAllah Ahmed <karahmed@...zon.de>

[ Upstream commit 86588296acbfb1591e92ba60221e95677ecadb43 ]

Mark the memory region with NOMAP flag instead of completely removing it
from the memory blocks. That makes the FDT handling consistent with the EFI
memory map handling.

Cc: Rob Herring <robh+dt@...nel.org>
Cc: Frank Rowand <frowand.list@...il.com>
Cc: devicetree@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: KarimAllah Ahmed <karahmed@...zon.de>
Signed-off-by: Quentin Perret <qperret@...gle.com>
Link: https://lore.kernel.org/r/20210115114544.1830068-2-qperret@google.com
Signed-off-by: Rob Herring <robh@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/of/fdt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 223d617ecfe17..036af904e0cfa 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -1154,7 +1154,7 @@ int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base,
 					phys_addr_t size, bool nomap)
 {
 	if (nomap)
-		return memblock_remove(base, size);
+		return memblock_mark_nomap(base, size);
 	return memblock_reserve(base, size);
 }
 
-- 
2.27.0