Re: [PATCH V2] mm/ioremap: Probe platform for p4d huge map support
- From
- Andrew Morton <akpm@linux-foundation.org>
- Date
- 2019-07-02 23:06:34
- Also in
- linux-arm-kernel, linux-mm
- Reply to
- Anshuman Khandual, 2019-06-28
On Fri, 28 Jun 2019 10:50:31 +0530 Anshuman Khandual [off-list ref] wrote:
Finishing up what the commit c2febafc67734a ("mm: convert generic code to
5-level paging") started out while levelling up P4D huge mapping support
at par with PUD and PMD. A new arch call back arch_ioremap_p4d_supported()
is being added which just maintains status quo (P4D huge map not supported)
on x86, arm64 and powerpc.
Does this have any runtime effects? If so, what are they and why? If
not, what's the actual point?