On Sat, Mar 23, 2019 at 05:40:12PM +0200, Mike Rapoport wrote: > I have no general objection, but I presume the patch will be significantly > simplified if the addition of 4K pages support will follow the removal of > the trampoline_pd_dir. > > That said, I didn't look into the details, since they will change > substantially, only some comments on the Kconfig part. > > On the high level, have you considered using large pages in setup_vm() and > the remapping everything with 4K pages in setup_vm_final()? This might > save you the whole ops-> churn.
That would be a great start. That being said the current tiny memory RISC-V devices don't even have a MMU, so the kernel pagetable mapping isn't even relevant for them. I'm just not sure adding more complexity in the early boot path for a borderline case (MMU and tiny memory with a tiny kernel image) is reall worth all the complexity.
