linux-kernel - Re: [PATCH] arm64: mm: Fix ARCH_LOW_ADDRESS_LIMIT when !CONFIG_ZONE

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Date:   Mon,  4 Jan 2021 11:49:34 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Cc:     Will Deacon <will@...nel.org>, peng.fan@....com,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] arm64: mm: Fix ARCH_LOW_ADDRESS_LIMIT when !CONFIG_ZONE_DMA

On Fri, 18 Dec 2020 17:33:07 +0100, Nicolas Saenz Julienne wrote:
> Systems configured with CONFIG_ZONE_DMA32, CONFIG_ZONE_NORMAL and
> !CONFIG_ZONE_DMA will fail to properly setup ARCH_LOW_ADDRESS_LIMIT. The
> limit will default to ~0ULL, effectively spanning the whole memory,
> which is too high for a configuration that expects low memory to be
> capped at 4GB.
> 
> Fix ARCH_LOW_ADDRESS_LIMIT by falling back to arm64_dma32_phys_limit
> when arm64_dma_phys_limit isn't set. arm64_dma32_phys_limit will honour
> CONFIG_ZONE_DMA32, or span the entire memory when not enabled.

Applied to arm64 (for-next/fixes), thanks!

[1/1] arm64: mm: Fix ARCH_LOW_ADDRESS_LIMIT when !CONFIG_ZONE_DMA
      https://git.kernel.org/arm64/c/095507dc1350

-- 
Catalin