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Subject: Re: [PATCH v4 12/13] mm/debug_vm_pgtable/hugetlb: Disable hugetlb
 test on ppc64
To: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>, linux-mm@kvack.org,
 akpm@linux-foundation.org
References: <20200902114222.181353-1-aneesh.kumar@linux.ibm.com>
 <20200902114222.181353-13-aneesh.kumar@linux.ibm.com>
From: Anshuman Khandual <anshuman.khandual@arm.com>
Message-ID: <6d5a896a-5796-0ca3-d7ca-0ff21cfb38d9@arm.com>
Date: Fri, 4 Sep 2020 11:49:06 +0530
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On 09/02/2020 05:12 PM, Aneesh Kumar K.V wrote:
> The seems to be missing quite a lot of details w.r.t allocating
> the correct pgtable_t page (huge_pte_alloc()), holding the right
> lock (huge_pte_lock()) etc. The vma used is also not a hugetlb VMA.
> 
> ppc64 do have runtime checks within CONFIG_DEBUG_VM for most of these.
> Hence disable the test on ppc64.
> 
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
> ---
>  mm/debug_vm_pgtable.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c
> index b53903fdee85..9afa1354326b 100644
> --- a/mm/debug_vm_pgtable.c
> +++ b/mm/debug_vm_pgtable.c
> @@ -811,6 +811,7 @@ static void __init hugetlb_basic_tests(unsigned long pfn, pgprot_t prot)
>  #endif /* CONFIG_ARCH_WANT_GENERAL_HUGETLB */
>  }
>  
> +#ifndef CONFIG_PPC_BOOK3S_64
>  static void __init hugetlb_advanced_tests(struct mm_struct *mm,
>  					  struct vm_area_struct *vma,
>  					  pte_t *ptep, unsigned long pfn,
> @@ -853,6 +854,7 @@ static void __init hugetlb_advanced_tests(struct mm_struct *mm,
>  	pte = huge_ptep_get(ptep);
>  	WARN_ON(!(huge_pte_write(pte) && huge_pte_dirty(pte)));
>  }
> +#endif
>  #else  /* !CONFIG_HUGETLB_PAGE */
>  static void __init hugetlb_basic_tests(unsigned long pfn, pgprot_t prot) { }
>  static void __init hugetlb_advanced_tests(struct mm_struct *mm,
> @@ -1065,7 +1067,9 @@ static int __init debug_vm_pgtable(void)
>  	pud_populate_tests(mm, pudp, saved_pmdp);
>  	spin_unlock(ptl);
>  
> +#ifndef CONFIG_PPC_BOOK3S_64
>  	hugetlb_advanced_tests(mm, vma, ptep, pte_aligned, vaddr, prot);
> +#endif
>  
>  	spin_lock(&mm->page_table_lock);
>  	p4d_clear_tests(mm, p4dp);
> 

Is it still required now that DEBUG_VM_PGTABLE has been dropped from powerpc
or you would like to re-enabled it back ?

https://lore.kernel.org/linuxppc-dev/159913592797.5893.5829441560236719450.b4-ty@ellerman.id.au/T/#m6d890e2fe84cf180cb875fae5f791e9c83db8d30