linux-kernel - [PATCH] LoongArch: Fix reserving screen info memory for above-4G firmware

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Message-ID: <20241203065010.4164506-1-chenhuacai@loongson.cn>
Date: Tue,  3 Dec 2024 14:50:10 +0800
From: Huacai Chen <chenhuacai@...ngson.cn>
To: Arnd Bergmann <arnd@...db.de>,
	Huacai Chen <chenhuacai@...nel.org>
Cc: loongarch@...ts.linux.dev,
	linux-arch@...r.kernel.org,
	Xuefeng Li <lixuefeng@...ngson.cn>,
	Guo Ren <guoren@...nel.org>,
	Xuerui Wang <kernel@...0n.name>,
	Jiaxun Yang <jiaxun.yang@...goat.com>,
	linux-kernel@...r.kernel.org,
	loongson-kernel@...ts.loongnix.cn,
	Huacai Chen <chenhuacai@...ngson.cn>,
	Xuefeng Zhao <zhaoxuefeng@...ngson.cn>,
	Jianmin Lv <lvjianmin@...ngson.cn>,
	Tianyang Zhang <zhangtianyang@...ngson.cn>
Subject: [PATCH] LoongArch: Fix reserving screen info memory for above-4G firmware

Since screen_info.lfb_base is a __u32 type, an above-4G address need an
ext_lfb_base to present its higher 32bits. In init_screen_info() we can
use __screen_info_lfb_base() to handle this case for reserving screen
info memory.

Signed-off-by: Xuefeng Zhao <zhaoxuefeng@...ngson.cn>
Signed-off-by: Jianmin Lv <lvjianmin@...ngson.cn>
Signed-off-by: Tianyang Zhang <zhangtianyang@...ngson.cn>
Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
---
 arch/loongarch/kernel/efi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/loongarch/kernel/efi.c b/arch/loongarch/kernel/efi.c
index 2bf86aeda874..de21e72759ee 100644
--- a/arch/loongarch/kernel/efi.c
+++ b/arch/loongarch/kernel/efi.c
@@ -95,7 +95,7 @@ static void __init init_screen_info(void)
 	memset(si, 0, sizeof(*si));
 	early_memunmap(si, sizeof(*si));
 
-	memblock_reserve(screen_info.lfb_base, screen_info.lfb_size);
+	memblock_reserve(__screen_info_lfb_base(&screen_info), screen_info.lfb_size);
 }
 
 void __init efi_init(void)
-- 
2.43.5