Re: [PATCH V3 0/2] mm/debug: Add tests for architecture exported page table helpers

Mike Rapoport
2019-09-24T12:32:09Z

On Tue, Sep 24, 2019 at 02:51:01PM +0300, Kirill A. Shutemov wrote:
> On Fri, Sep 20, 2019 at 12:03:21PM +0530, Anshuman Khandual wrote:
> > This series adds a test validation for architecture exported page table
> > helpers. Patch in the series adds basic transformation tests at various
> > levels of the page table. Before that it exports gigantic page allocation
> > function from HugeTLB.
> >
> > This test was originally suggested by Catalin during arm64 THP migration
> > RFC discussion earlier. Going forward it can include more specific tests
> > with respect to various generic MM functions like THP, HugeTLB etc and
> > platform specific tests.
> >
> > https://lore.kernel.org/linux-mm/20190628102003.GA56463@arrakis.emea.arm.com/
> >
> > Testing:
> >
> > Successfully build and boot tested on both arm64 and x86 platforms without
> > any test failing. Only build tested on some other platforms. Build failed
> > on some platforms (known) in pud_clear_tests() as there were no available
> > __pgd() definitions.
> >
> > - ARM32
> > - IA64
>
> Hm. Grep shows __pgd() definitions for both of them. Is it for specific
> config?

For ARM32 it's defined only for 3-lelel page tables, i.e with LPAE on.
For IA64 it's defined for !STRICT_MM_TYPECHECKS which is even not a config
option, but a define in arch/ia64/include/asm/page.h

> --
> Kirill A. Shutemov

--
Sincerely yours,
Mike.