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
