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SubjectRe: [PATCH] powerpc: ensure that swiotlb buffer is allocated from low memory
On Wed, 2019-12-04 at 12:35:24 UTC, Mike Rapoport wrote:
> From: Mike Rapoport <>
> Some powerpc platforms (e.g. 85xx) limit DMA-able memory way below 4G. If a
> system has more physical memory than this limit, the swiotlb buffer is not
> addressable because it is allocated from memblock using top-down mode.
> Force memblock to bottom-up mode before calling swiotlb_init() to ensure
> that the swiotlb buffer is DMA-able.
> Link:
> Reported-by: Christian Zigotzky <>
> Signed-off-by: Mike Rapoport <>

Applied to powerpc fixes, thanks.


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