On 03/26/2020 08:53 PM, Christophe Leroy wrote: > > > Le 26/03/2020 à 03:23, Anshuman Khandual a écrit : >> >> >> On 03/24/2020 10:52 AM, Anshuman Khandual wrote: >>> 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. >> >> If folks can test these patches out on remaining ARCH_HAS_DEBUG_VM_PGTABLE >> enabled platforms i.e s390, arc, powerpc (32 and 64), that will be really >> appreciated. Thank you. >> > > On powerpc 8xx (PPC32), I get: > > [ 53.338368] debug_vm_pgtable: debug_vm_pgtable: Validating architecture page table helpers > [ 53.347403] ------------[ cut here ]------------ > [ 53.351832] WARNING: CPU: 0 PID: 1 at mm/debug_vm_pgtable.c:647 debug_vm_pgtable+0x280/0x3f4 mm/debug_vm_pgtable.c:647 ? With the following commits in place 53a8338ce (HEAD) Documentation/mm: Add descriptions for arch page table helper 5d4913fc1 mm/debug: Add tests validating arch advanced page table helpers bcaf120a7 mm/debug: Add tests validating arch page table helpers for core features d6ed5a4a5 x86/memory: Drop pud_mknotpresent() 0739d1f8d mm/debug: Add tests validating architecture page table helpers 16fbf79b0 (tag: v5.6-rc7) Linux 5.6-rc7 mm/debug_vm_pgtable.c:647 is here. #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION static void __init pmd_swap_tests(unsigned long pfn, pgprot_t prot) { swp_entry_t swp; pmd_t pmd; -----------------------------> Line #647 pmd = pfn_pmd(pfn, prot); swp = __pmd_to_swp_entry(pmd); WARN_ON(!pmd_same(pmd, __swp_entry_to_pmd(swp))); } #else static void __init pmd_swap_tests(unsigned long pfn, pgprot_t prot) { } #end Did I miss something ? > [ 53.360140] CPU: 0 PID: 1 Comm: swapper Not tainted 5.6.0-rc7-s3k-dev-01090-g92710e99881f #3544 > [ 53.368718] NIP: c0777c04 LR: c0777bb8 CTR: 00000000 > [ 53.373720] REGS: c9023df0 TRAP: 0700 Not tainted (5.6.0-rc7-s3k-dev-01090-g92710e99881f) > [ 53.382042] MSR: 00029032 <EE,ME,IR,DR,RI> CR: 22000222 XER: 20000000 > [ 53.388667] > [ 53.388667] GPR00: c0777bb8 c9023ea8 c6120000 00000001 1e410000 00000000 00000000 007641c9 > [ 53.388667] GPR08: 00000000 00000001 00000000 ffffffff 82000222 00000000 c00039b8 00000000 > [ 53.388667] GPR16: 00000000 00000000 00000000 fffffff0 065fc000 1e410000 c6600000 000001e4 > [ 53.388667] GPR24: 000001d9 c062d14c c65fc000 c642d448 000006c9 00000000 c65f8000 c65fc040 > [ 53.423400] NIP [c0777c04] debug_vm_pgtable+0x280/0x3f4 > [ 53.428559] LR [c0777bb8] debug_vm_pgtable+0x234/0x3f4 > [ 53.433593] Call Trace: > [ 53.436048] [c9023ea8] [c0777bb8] debug_vm_pgtable+0x234/0x3f4 (unreliable) > [ 53.442936] [c9023f28] [c00039e0] kernel_init+0x28/0x124 > [ 53.448184] [c9023f38] [c000f174] ret_from_kernel_thread+0x14/0x1c > [ 53.454245] Instruction dump: > [ 53.457180] 41a20008 4bea3ed9 62890021 7d36b92e 7d36b82e 71290fd0 3149ffff 7d2a4910 > [ 53.464838] 0f090000 5789077e 3149ffff 7d2a4910 <0f090000> 38c00000 38a00000 38800000 > [ 53.472671] ---[ end trace fd5dd92744dc0065 ]--- Could you please point me to the exact test which is failing ? > [ 53.519778] Freeing unused kernel memory: 608K > > So I assume that the system should have come till runtime just fine apart from the above warning message because.
