Re: [PATCH] dma-contiguous: hornor the cma address limit setup by user

[Marek Szyprowski]

On 12.06.2025 04:14, Feng Tang wrote:
> When porting a cma related usage from x86_64 server to arm64 server,
> the "cma=4G@4G" setup failed on arm64. The reason is arm64 and some
> other architectures have specific physical address limit for reserved
> cma area, like 4GB due to the device's need for 32 bit dma. Actually
> lots of platforms of those architectures don't have this device dma
> limit, but still have to obey it, and are not able to reserve a huge
> cma pool.
>
> This situation could be improved by honoring the user input cma
> physical address than the arch limit. As when users specify it, they
> already knows what the default is which probably can't suit them.
>
> Suggested-by: Robin Murphy <robin.murphy@xxxxxxx>
> Signed-off-by: Feng Tang <feng.tang@xxxxxxxxxxxxxxxxx>

Thanks, applied to dma-mapping-fixes branch.

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland