Re: [PATCH v2] udmabuf: respect the device's maximum segment sizeg

[Karl Mehltretter]

On Tue, Sep 29, 2026 at 09:03:17AM +0100, Jason Gunthorpe wrote:
> On Tue, Sep 29, 2026 at 08:56:01AM +0200, Karl Mehltretter wrote:
> > Right, the misc device has no dma_parms, so it gets the 64K default and
> > sync fails with 256K pages
> 
> I would ignore this, it seems fictional to me, and if someone really
> needs to support this rediculous combination it should be done inside
> sg_alloc_table_from_pages_segment(:)
>  

Fair enough, Sashiko got me there. Looking around, 256K pages seem
to be barely supported today: they were already disabled for 47x, and
I couldn't get userspace running on a 256K-page 44x kernel in QEMU.

I'll leave v2 as is. Thanks for the review.

Karl