linux-kernel - [PATCH AUTOSEL 5.4 02/14] ARM: rockchip: Use memcpy

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Date:   Mon, 20 Dec 2021 20:59:40 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     "Ivan T. Ivanov" <iivanov@...e.de>,
        Heiko Stuebner <heiko@...ech.de>,
        Sasha Levin <sashal@...nel.org>, linux@...linux.org.uk,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.4 02/14] ARM: rockchip: Use memcpy_toio instead of memcpy on smp bring-up

From: "Ivan T. Ivanov" <iivanov@...e.de>

[ Upstream commit 423e85e97aaf69e5198bbec6811e3825c8b5019a ]

This fixes a potential kernel panic on memcpy when FORTIFY_SOURCE
is enabled. Because memory is iomem use appropriate function for
accessing it.

Signed-off-by: Ivan T. Ivanov <iivanov@...e.de>
Link: https://lore.kernel.org/r/20211116084616.24811-1-iivanov@suse.de
Signed-off-by: Heiko Stuebner <heiko@...ech.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/arm/mach-rockchip/platsmp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/mach-rockchip/platsmp.c b/arch/arm/mach-rockchip/platsmp.c
index 649e0a54784cd..8ee6e4b309b37 100644
--- a/arch/arm/mach-rockchip/platsmp.c
+++ b/arch/arm/mach-rockchip/platsmp.c
@@ -189,7 +189,7 @@ static int __init rockchip_smp_prepare_sram(struct device_node *node)
 	rockchip_boot_fn = __pa_symbol(secondary_startup);
 
 	/* copy the trampoline to sram, that runs during startup of the core */
-	memcpy(sram_base_addr, &rockchip_secondary_trampoline, trampoline_sz);
+	memcpy_toio(sram_base_addr, &rockchip_secondary_trampoline, trampoline_sz);
 	flush_cache_all();
 	outer_clean_range(0, trampoline_sz);
 
-- 
2.34.1