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Subject: Re: [PATCH v4 05/13] mm/debug_vm_pgtable/savedwrite: Enable
 savedwrite test with CONFIG_NUMA_BALANCING
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>
 <20200902114222.181353-6-aneesh.kumar@linux.ibm.com>
From: Anshuman Khandual <anshuman.khandual@arm.com>
Message-ID: <b89d69b2-caa0-e8e2-9401-8b3ff1546fbe@arm.com>
Date: Fri, 4 Sep 2020 09:39:24 +0530
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On 09/02/2020 05:12 PM, Aneesh Kumar K.V wrote:
> Saved write support was added to track the write bit of a pte after
> marking the pte protnone. This was done so that AUTONUMA can convert
> a write pte to protnone and still track the old write bit. When converting
> it back we set the pte write bit correctly thereby avoiding a write fault
> again. Hence enable the test only when CONFIG_NUMA_BALANCING is enabled and
> use protnone protflags.
> 
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
> ---
>  mm/debug_vm_pgtable.c | 11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c
> index 4c73e63b4ceb..8704901f6bd8 100644
> --- a/mm/debug_vm_pgtable.c
> +++ b/mm/debug_vm_pgtable.c
> @@ -119,10 +119,14 @@ static void __init pte_savedwrite_tests(unsigned long pfn, pgprot_t prot)
>  {
>  	pte_t pte = pfn_pte(pfn, prot);
>  
> +	if (!IS_ENABLED(CONFIG_NUMA_BALANCING))
> +		return;
> +
>  	pr_debug("Validating PTE saved write\n");
>  	WARN_ON(!pte_savedwrite(pte_mk_savedwrite(pte_clear_savedwrite(pte))));
>  	WARN_ON(pte_savedwrite(pte_clear_savedwrite(pte_mk_savedwrite(pte))));
>  }
> +
>  #ifdef CONFIG_TRANSPARENT_HUGEPAGE
>  static void __init pmd_basic_tests(unsigned long pfn, pgprot_t prot)
>  {
> @@ -234,6 +238,9 @@ static void __init pmd_savedwrite_tests(unsigned long pfn, pgprot_t prot)
>  {
>  	pmd_t pmd = pfn_pmd(pfn, prot);
>  
> +	if (!IS_ENABLED(CONFIG_NUMA_BALANCING))
> +		return;
> +
>  	pr_debug("Validating PMD saved write\n");
>  	WARN_ON(!pmd_savedwrite(pmd_mk_savedwrite(pmd_clear_savedwrite(pmd))));
>  	WARN_ON(pmd_savedwrite(pmd_clear_savedwrite(pmd_mk_savedwrite(pmd))));
> @@ -1019,8 +1026,8 @@ static int __init debug_vm_pgtable(void)
>  	pmd_huge_tests(pmdp, pmd_aligned, prot);
>  	pud_huge_tests(pudp, pud_aligned, prot);
>  
> -	pte_savedwrite_tests(pte_aligned, prot);
> -	pmd_savedwrite_tests(pmd_aligned, prot);
> +	pte_savedwrite_tests(pte_aligned, protnone);
> +	pmd_savedwrite_tests(pmd_aligned, protnone);
>  
>  	pte_unmap_unlock(ptep, ptl);
>  
> 

No more checkpatch.pl warnings.

Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>