Re: [PATCH V4 0/4] mm/debug_vm_pgtable: Add some more tests

[Anshuman Khandual]

On 07/06/2020 06:18 AM, Anshuman Khandual wrote:
> This series adds some more arch page table helper validation tests which
> are related to core and advanced memory functions. This also creates a
> documentation, enlisting expected semantics for all page table helpers as
> suggested by Mike Rapoport previously (https://lkml.org/lkml/2020/1/30/40).
> 
> There are many TRANSPARENT_HUGEPAGE and ARCH_HAS_TRANSPARENT_HUGEPAGE_PUD
> ifdefs scattered across the test. But consolidating all the fallback stubs
> is not very straight forward because ARCH_HAS_TRANSPARENT_HUGEPAGE_PUD is
> not explicitly dependent on ARCH_HAS_TRANSPARENT_HUGEPAGE.
> 
> Tested on arm64, x86 platforms but only build tested on all other enabled
> platforms through ARCH_HAS_DEBUG_VM_PGTABLE i.e powerpc, arc, s390. The
> following failure on arm64 still exists which was mentioned previously. It
> will be fixed with the upcoming THP migration on arm64 enablement series.
> 
> WARNING .... mm/debug_vm_pgtable.c:860 debug_vm_pgtable+0x940/0xa54
> WARN_ON(!pmd_present(pmd_mkinvalid(pmd_mkhuge(pmd))))
> 
> This series is based on v5.8-rc4.
> 
> Changes in V4:
> 
> - Replaced READ_ONCE() with ptep_get() while accessing PTE pointers per Christophe
> - Fixed function argument alignments per Christophe

+Cc - Zi Yan, Gerald Schaefer, Christophe Leroy

The Cc list was not complete. Please do let me know if you could
not retrieve all the four patches of the series from the list.

- Anshuman