[PATCH 6.18 688/752] LoongArch: Prefer top-down allocation after arch_mem_init()

Sasha Levin
2026-02-28T17:58:23Z

From: Huacai Chen <chenhuacai@loongson.cn>

[ Upstream commit 2172d6ebac9372eb01fe4505a53e18cb061e103b ]

Currently we use bottom-up allocation after sparse_init(), the reason is
sparse_init() need a lot of memory, and bottom-up allocation may exhaust
precious low memory (below 4GB). On the other hand, SWIOTLB and CMA need
low memories for DMA32, so swiotlb_init() and dma_contiguous_reserve()
need bottom-up allocation.

Since swiotlb_init() and dma_contiguous_reserve() are both called in
arch_mem_init(), we no longer need bottom-up allocation after that. So
we set the allocation policy to top-down at the end of arch_mem_init(),
in order to avoid later memory allocations (such as KASAN) exhaust low
memory.

This solve at least two problems:
1. Some buggy BIOSes use 0xfd000000~0xfe000000 for secondary CPUs, but
didn't reserve this range, which causes smpboot failures.
2. Some DMA32 devices, such as Loongson-DRM and OHCI, cannot work with
KASAN enabled.

Cc: stable@vger.kernel.org
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/loongarch/kernel/setup.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/arch/loongarch/kernel/setup.c b/arch/loongarch/kernel/setup.c
index 20cb6f3064568..2b260d15b2e25 100644
--- a/arch/loongarch/kernel/setup.c
+++ b/arch/loongarch/kernel/setup.c
@@ -421,6 +421,7 @@ static void __init arch_mem_init(char **cmdline_p)
PFN_UP(__pa_symbol(&__nosave_end)));

memblock_dump_all();
+ memblock_set_bottom_up(false);

early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
}
--
2.51.0