[PATCH v1 0/2] udmabuf: Add back support for mapping hugetlb pages

[Jason Gunthorpe]

On Fri, Jun 23, 2023 at 01:28:24PM -0400, Peter Xu wrote:
> On Fri, Jun 23, 2023 at 01:37:58PM -0300, Jason Gunthorpe wrote:
> > On Fri, Jun 23, 2023 at 12:35:45PM -0400, Peter Xu wrote:
> > 
> > > It seems the previous concern on using gup was majorly fork(), if this is it:
> > > 
> > > https://patchwork.freedesktop.org/patch/210992/?series=39879&rev=2#comment_414213
> > 
> > Fork and GUP have been fixed since that comment anyhow there is no
> > longer a problem using GUP and fork together.
> 
> Ah, I read it previously as a requirement that the child will also be able
> the see the same / coherent page when manipulating the dmabuf later after
> fork(), e.g., the udmabuf can be created before fork().

That always worked, just use MAP_SHARED.

Jason