Re: [PATCH v4 02/10] PCI/P2PDMA: Add CONFIG_PCI_P2PDMA_CORE

[Logan Gunthorpe]

On 2026-07-02 10:44 a.m., Matt Evans wrote:
>> So maybe at this point it's fine to enable this on 32bit systems and we
>> can remove this requirement. However, I think we should do that
>> explicitly in its own patch, not hide it in this refactoring patch.
> 
> Your question does prove it's too stealthy as-is. :)  PCI_P2PDMA still
> can't be enabled on 32-bit systems because of its ZONE_DEVICE -> 
> MEMORY_HOTPLUG -> 64BIT dependency.  So we're not enabling 32-bit 
> support for PCI_P2PDMA here, but it's not obvious and so I'll re-add the 
> `depends on 64BIT`.  At least then it won't be enabled without intention 
> if someone enables ZONE_DEVICE on 32-bit systems...

Ok, that all makes sense to me. I would be good with removing the 64BIT
dependency (as it is is a bit confusing as is) but I think adding
another patch would be appropriate with some of the commit message notes
you mentioned in your emails.

Besides that, I think you can add to this patch:

Reviewed-by: Logan Gunthorpe <logang@xxxxxxxxxxxx>

Thanks,

Logan