This series adds more arch page table helper tests. The new tests here are either related to core memory functions and advanced arch pgtable helpers. This also creates a documentation file enlisting all expected semantics as suggested by Mike Rapoport (https://lkml.org/lkml/2020/1/30/40).
This series has been tested on arm64 and x86 platforms. There is just one expected failure on arm64 that will be fixed when we enable THP migration. [ 21.741634] WARNING: CPU: 0 PID: 1 at mm/debug_vm_pgtable.c:782 which corresponds to WARN_ON(!pmd_present(pmd_mknotpresent(pmd_mkhuge(pmd)))) 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. This series has been build tested on many platforms including the ones that subscribe the test through ARCH_HAS_DEBUG_VM_PGTABLE. This series is based on v5.6-rc7 after applying these following patches. 1. https://patchwork.kernel.org/patch/11431277/ 2. https://patchwork.kernel.org/patch/11452185/ Changes in V2: - Dropped CONFIG_ARCH_HAS_PTE_SPECIAL per Christophe - Dropped CONFIG_NUMA_BALANCING per Christophe - Dropped CONFIG_HAVE_ARCH_SOFT_DIRTY per Christophe - Dropped CONFIG_MIGRATION per Christophe - Replaced CONFIG_S390 with __HAVE_ARCH_PMDP_INVALIDATE - Moved page allocation & free inside swap_migration_tests() per Christophe - Added CONFIG_TRANSPARENT_HUGEPAGE to protect pfn_pmd() - Added CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD to protect pfn_pud() - Added a patch for other arch advanced page table helper tests - Added a patch creating a documentation for page table helper semantics Changes in V1: (https://patchwork.kernel.org/patch/11408253/) Cc: Jonathan Corbet <cor...@lwn.net> Cc: Andrew Morton <a...@linux-foundation.org> Cc: Mike Rapoport <r...@linux.ibm.com> Cc: Vineet Gupta <vgu...@synopsys.com> Cc: Catalin Marinas <catalin.mari...@arm.com> Cc: Will Deacon <w...@kernel.org> Cc: Benjamin Herrenschmidt <b...@kernel.crashing.org> Cc: Paul Mackerras <pau...@samba.org> Cc: Michael Ellerman <m...@ellerman.id.au> Cc: Heiko Carstens <heiko.carst...@de.ibm.com> Cc: Vasily Gorbik <g...@linux.ibm.com> Cc: Christian Borntraeger <borntrae...@de.ibm.com> Cc: Thomas Gleixner <t...@linutronix.de> Cc: Ingo Molnar <mi...@redhat.com> Cc: Borislav Petkov <b...@alien8.de> Cc: "H. Peter Anvin" <h...@zytor.com> Cc: Kirill A. Shutemov <kir...@shutemov.name> Cc: Paul Walmsley <paul.walms...@sifive.com> Cc: Palmer Dabbelt <pal...@dabbelt.com> Cc: linux-snps-...@lists.infradead.org Cc: linux-arm-ker...@lists.infradead.org Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-s...@vger.kernel.org Cc: linux-ri...@lists.infradead.org Cc: x...@kernel.org Cc: linux-...@vger.kernel.org Cc: linux-a...@vger.kernel.org Cc: linux-ker...@vger.kernel.org Anshuman Khandual (3): mm/debug: Add tests validating arch page table helpers for core features mm/debug: Add tests validating arch advanced page table helpers Documentation/mm: Add descriptions for arch page table helpers Documentation/vm/arch_pgtable_helpers.rst | 256 ++++++++++ mm/debug_vm_pgtable.c | 594 +++++++++++++++++++++- 2 files changed, 839 insertions(+), 11 deletions(-) create mode 100644 Documentation/vm/arch_pgtable_helpers.rst -- 2.20.1
