On Fri, May 16, 2025 at 06:42:03AM -0700, Dave Hansen wrote:
> On 5/16/25 05:33, Kirill A. Shutemov wrote:
> > 5-level paging only supports SPARSEMEM_VMEMMAP. CONFIG_X86_5LEVEL is
> > being phased out, making 5-level paging support mandatory.
> >
> > Make CONFIG_SPARSEMEM_VMEMMAP mandatory for x86-64 and eliminate
> > any associated conditional statements.
> I think we have ourselves a catch-22 here.
>
> SPARSEMEM_VMEMMAP was selected because the other sparsemem modes
> couldn't handle a dynamic MAX_PHYS{MEM,ADDR}_BITS introduced by 5-level
> paging. Now you're proposing making it static again, but keeping the
> SPARSEMEM_VMEMMAP dependency.
>
> If you remove the dynamic MAX_PHYS{MEM,ADDR}_BITS, you should also
> remove the dependency on SPARSEMEM_VMEMMAP. No?
I guess. But how?
And is there any value to support !SPARSEMEM_VMEMMAP?
--
Kiryl Shutsemau / Kirill A. Shutemov
