linux-kernel - [PATCH] LoongArch: numa: Fix high

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Date:   Tue, 26 Sep 2023 20:10:31 +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>, stable@...r.kernel.org,
        Chong Qiao <qiaochong@...ngson.cn>
Subject: [PATCH] LoongArch: numa: Fix high_memory calculation

high_memory is the virtual address of the 'highest physical address' in
the system. But __va(get_num_physpages() << PAGE_SHIFT) is not what we
want because there may be holes in the physical address space. On the
other hand, max_low_pfn is calculated from memblock_end_of_DRAM(), which
is exactly corresponding to the highest physical address, so use it for
high_memory calculation.

Cc: <stable@...r.kernel.org>
Signed-off-by: Chong Qiao <qiaochong@...ngson.cn>
Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
---
 arch/loongarch/kernel/numa.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/loongarch/kernel/numa.c b/arch/loongarch/kernel/numa.c
index c7d33c489e04..6e65ff12d5c7 100644
--- a/arch/loongarch/kernel/numa.c
+++ b/arch/loongarch/kernel/numa.c
@@ -436,7 +436,7 @@ void __init paging_init(void)
 
 void __init mem_init(void)
 {
-	high_memory = (void *) __va(get_num_physpages() << PAGE_SHIFT);
+	high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
 	memblock_free_all();
 }
 
-- 
2.39.3