linux-kernel - [PATCH v1] MIPS: Malta: fix alignment of the devicetree buffer

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Date:   Thu,  2 Sep 2021 09:19:51 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Rob Herring <robh@...nel.org>
Cc:     Oleksij Rempel <o.rempel@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paulburton@...nel.org>
Subject: [PATCH v1] MIPS: Malta: fix alignment of the devicetree buffer

Starting with following patch MIPS Malta is not able to boot:
| commit 79edff12060fe7772af08607eff50c0e2486c5ba
| Author: Rob Herring <robh@...nel.org>
| scripts/dtc: Update to upstream version v1.6.0-51-g183df9e9c2b9

The reason is the alignment test added to the fdt_ro_probe_(). To fix
this issue, we need to make sure that fdt_buf is aligned.

Since the dtc patch was designed to uncover potential issue, I handle
initial MIPS Malta patch as initial bug.

Fixes: e81a8c7dabac ("MIPS: Malta: Setup RAM regions via DT")
Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
---
 arch/mips/mti-malta/malta-dtshim.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/mips/mti-malta/malta-dtshim.c b/arch/mips/mti-malta/malta-dtshim.c
index 0ddf03df6268..f451268f6c38 100644
--- a/arch/mips/mti-malta/malta-dtshim.c
+++ b/arch/mips/mti-malta/malta-dtshim.c
@@ -22,7 +22,7 @@
 #define  ROCIT_CONFIG_GEN1_MEMMAP_SHIFT	8
 #define  ROCIT_CONFIG_GEN1_MEMMAP_MASK	(0xf << 8)
 
-static unsigned char fdt_buf[16 << 10] __initdata;
+static unsigned char fdt_buf[16 << 10] __initdata __aligned(8);
 
 /* determined physical memory size, not overridden by command line args	 */
 extern unsigned long physical_memsize;
-- 
2.30.2