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From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org, Anshuman Khandual <anshuman.khandual@arm.com>,
	linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH v4 00/13] mm/debug_vm_pgtable fixes
Date: Wed, 14 Oct 2020 08:45:16 +0530
Message-ID: <034db663-a5bd-fd5e-b7f6-3ec31310e8e5@linux.ibm.com> (raw)
In-Reply-To: <20201013135858.f4a7f0c5f3b0a69a2a304cfe@linux-foundation.org>

On 10/14/20 2:28 AM, Andrew Morton wrote:
> On Wed,  2 Sep 2020 17:12:09 +0530 "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com> wrote:
> 
>> This patch series includes fixes for debug_vm_pgtable test code so that
>> they follow page table updates rules correctly. The first two patches introduce
>> changes w.r.t ppc64. The patches are included in this series for completeness. We can
>> merge them via ppc64 tree if required.
> 
> Do you think this series is ready to be merged?

Hopefully, except for the Riscv crash.

> 
> Possibly-unresolved issues which I have recorded are
> 
> Against
> mm-debug_vm_pgtable-locks-move-non-page-table-modifying-test-together.patch:
> 
> https://lkml.kernel.org/r/56830efb-887e-0000-a46e-ae015e5854cd@arm.com

I guess the full series do boot fine on arm.

> https://lkml.kernel.org/r/20200910075752.GC26874@shao2-debian

This should be fixed by

https://ozlabs.org/~akpm/mmots/broken-out/mm-debug_vm_pgtable-avoid-doing-memory-allocation-with-pgtable_t-mapped.patch

> 
> Against mm-debug_vm_pgtable-avoid-none-pte-in-pte_clear_test.patch:
> 
> https://lkml.kernel.org/r/87zh5wx51b.fsf@linux.ibm.com


yes this one we should get fixed. I was hoping someone familiar with 
Riscv pte updates rules would pitch in. IIUC we need to update 
RANDON_ORVALUE similar to how we updated it for s390 and ppc64.


  Alternatively we can do this

modified   mm/debug_vm_pgtable.c
@@ -548,7 +548,7 @@ static void __init pte_clear_tests(struct mm_struct 
*mm, pte_t *ptep,
  	pte_t pte = pfn_pte(pfn, prot);

  	pr_debug("Validating PTE clear\n");
-	pte = __pte(pte_val(pte) | RANDOM_ORVALUE);
+//	pte = __pte(pte_val(pte) | RANDOM_ORVALUE);
  	set_pte_at(mm, vaddr, ptep, pte);
  	barrier();
  	pte_clear(mm, vaddr, ptep);

till we get that feedback from RiscV team?

> https://lkml.kernel.org/r/37a9facc-ca36-290f-3748-16c4a7a778fa@arm.com

same as the above.

> https://lkml.kernel.org/r/20201011200258.GA91021@roeck-us.net
> 

same as the above.

-aneesh

  reply index

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-02 11:42 Aneesh Kumar K.V
2020-09-02 11:42 ` [PATCH v4 01/13] powerpc/mm: Add DEBUG_VM WARN for pmd_clear Aneesh Kumar K.V
2020-09-02 11:42 ` [PATCH v4 02/13] powerpc/mm: Move setting pte specific flags to pfn_pte Aneesh Kumar K.V
2020-09-02 12:30   ` Christophe Leroy
2020-09-02 11:42 ` [PATCH v4 03/13] mm/debug_vm_pgtable/ppc64: Avoid setting top bits in radom value Aneesh Kumar K.V
2020-09-04  4:03   ` Anshuman Khandual
2020-09-02 11:42 ` [PATCH v4 04/13] mm/debug_vm_pgtables/hugevmap: Use the arch helper to identify huge vmap support Aneesh Kumar K.V
2020-09-02 12:40   ` Christophe Leroy
2020-09-02 12:53     ` Aneesh Kumar K.V
2020-09-04  4:08   ` Anshuman Khandual
2020-09-02 11:42 ` [PATCH v4 05/13] mm/debug_vm_pgtable/savedwrite: Enable savedwrite test with CONFIG_NUMA_BALANCING Aneesh Kumar K.V
2020-09-04  4:09   ` Anshuman Khandual
2020-09-02 11:42 ` [PATCH v4 06/13] mm/debug_vm_pgtable/THP: Mark the pte entry huge before using set_pmd/pud_at Aneesh Kumar K.V
2020-09-04  5:21   ` Anshuman Khandual
2020-09-02 11:42 ` [PATCH v4 07/13] mm/debug_vm_pgtable/set_pte/pmd/pud: Don't use set_*_at to update an existing pte entry Aneesh Kumar K.V
2020-09-04  5:34   ` Anshuman Khandual
2020-09-02 11:42 ` [PATCH v4 08/13] mm/debug_vm_pgtable/locks: Move non page table modifying test together Aneesh Kumar K.V
2020-09-04  3:58   ` Anshuman Khandual
2020-09-02 11:42 ` [PATCH v4 09/13] mm/debug_vm_pgtable/locks: Take correct page table lock Aneesh Kumar K.V
2020-09-04  5:39   ` Anshuman Khandual
2020-09-02 11:42 ` [PATCH v4 10/13] mm/debug_vm_pgtable/thp: Use page table depost/withdraw with THP Aneesh Kumar K.V
2020-09-04  4:21   ` Anshuman Khandual
2020-09-02 11:42 ` [PATCH v4 11/13] mm/debug_vm_pgtable/pmd_clear: Don't use pmd/pud_clear on pte entries Aneesh Kumar K.V
2020-09-04  6:03   ` Anshuman Khandual
2020-09-02 11:42 ` [PATCH v4 12/13] mm/debug_vm_pgtable/hugetlb: Disable hugetlb test on ppc64 Aneesh Kumar K.V
2020-09-04  6:19   ` Anshuman Khandual
2020-09-02 11:42 ` [PATCH v4 13/13] mm/debug_vm_pgtable: Avoid none pte in pte_clear_test Aneesh Kumar K.V
2020-09-11  2:13   ` Nathan Chancellor
2020-09-11  5:21     ` Aneesh Kumar K.V
2020-09-23  3:14       ` Anshuman Khandual
2020-10-11 20:02   ` Guenter Roeck
2020-10-12  4:29     ` Aneesh Kumar K.V
2020-09-02 11:46 ` Aneesh Kumar K.V
2020-09-04  4:16   ` Anshuman Khandual
2020-09-04  6:48 ` [PATCH v4 00/13] mm/debug_vm_pgtable fixes Anshuman Khandual
2020-09-04 15:26   ` Gerald Schaefer
2020-09-04 16:01     ` Gerald Schaefer
2020-09-04 17:53       ` Gerald Schaefer
2020-09-09  8:38         ` Anshuman Khandual
2020-09-08 15:39       ` Gerald Schaefer
2020-09-09  6:08         ` Aneesh Kumar K.V
2020-09-09 11:16           ` Gerald Schaefer
2020-09-09  8:15       ` Anshuman Khandual
2020-09-09 11:10         ` Gerald Schaefer
2020-09-09  8:08     ` Anshuman Khandual
2020-09-09 11:36       ` Gerald Schaefer
2020-09-13 11:03 ` [PATCH] mm/debug_vm_pgtable: Avoid doing memory allocation with pgtable_t mapped Aneesh Kumar K.V
2020-09-13 13:42   ` Matthew Wilcox
2020-10-13 20:58 ` [PATCH v4 00/13] mm/debug_vm_pgtable fixes Andrew Morton
2020-10-14  3:15   ` Aneesh Kumar K.V [this message]
2020-10-14 20:36     ` Andrew Morton
2020-10-15  2:59       ` Anshuman Khandual

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