[PATCH] lmb: Reinstate access to memory above ram_top

[Marek Vasut]

On 3/24/26 11:13 AM, Ilias Apalodimas wrote:

Hello Ilias,

>> Unrelated to whether this is going to be an issue or not, I think we
>> have two things to do here:
>>
>> - Consider ram_top , get input from Heinrich on that
>> - DMA32 ... how to design that, should that be a special LMB pool ? How
>> do we handle hardware which has no memory below 4 GiB, iommu maybe ?
> 
> Why don't we add hints in the driver model that explains the device
> limitations? That would make the core code more readable as all the
> info we need to decide on the memory allocation is packed with the
> device
Indeed, this is what Linux already does with DMA masks.