Re: [PATCH V2 0/3] mm/debug: Add more arch page table helper tests

[Christophe Leroy]

Le 26/03/2020 Ã 03:23, Anshuman Khandual a ÃcritÂ:
> 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
[   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 ]---
[   53.519778] Freeing unused kernel memory: 608K