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Subject: Re: [PATCH v3 02/12] mm/debug_vm_pgtable: Use struct
 pgtable_debug_args in basic tests
To:     Gavin Shan <gshan@redhat.com>, linux-mm@kvack.org
Cc:     linux-kernel@vger.kernel.org, catalin.marinas@arm.com,
        will@kernel.org, akpm@linux-foundation.org, chuhu@redhat.com,
        shan.gavin@gmail.com
References: <20210719130613.334901-1-gshan@redhat.com>
 <20210719130613.334901-3-gshan@redhat.com>
From:   Anshuman Khandual <anshuman.khandual@arm.com>
Message-ID: <20c7be76-661b-6e75-3721-7b577fb4e05d@arm.com>
Date:   Wed, 21 Jul 2021 11:27:25 +0530
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On 7/19/21 6:36 PM, Gavin Shan wrote:
> This uses struct pgtable_debug_args in the basic test functions. There
> are more cleanups applied:
> 
>    * Move hugetlb_basic_tests() so that the basic tests are treated
>      as a bundle.

Please dont move this test as it is placed near to the THP functions.
Also please don't club any non-related changes here while converting
various tests into this new arg structure.

> 
>    * Drop parameters to {pgd, p4d}_basic_tests() as they're never
>      used.

Right, they are not getting used right now. But then it might be just
better to replace them with this new structure in order not to do any
unrelated changes.

> 
>    * Drop unused variables @{pgd, p4d}_aligned in debug_vm_pgtable().
> 
> Signed-off-by: Gavin Shan <gshan@redhat.com>
> ---
>  mm/debug_vm_pgtable.c | 51 ++++++++++++++++++++-----------------------
>  1 file changed, 24 insertions(+), 27 deletions(-)
> 
> diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c
> index ea153ff40d23..5f79d725f8d8 100644
> --- a/mm/debug_vm_pgtable.c
> +++ b/mm/debug_vm_pgtable.c
> @@ -88,10 +88,10 @@ struct pgtable_debug_args {
>  	unsigned long		fixed_pte_pfn;
>  };
>  
> -static void __init pte_basic_tests(unsigned long pfn, int idx)
> +static void __init pte_basic_tests(struct pgtable_debug_args *args, int idx)
>  {
>  	pgprot_t prot = protection_map[idx];
> -	pte_t pte = pfn_pte(pfn, prot);
> +	pte_t pte = pfn_pte(args->fixed_pte_pfn, prot);
>  	unsigned long val = idx, *ptr = &val;
>  
>  	pr_debug("Validating PTE basic (%pGv)\n", ptr);
> @@ -173,7 +173,7 @@ static void __init pte_savedwrite_tests(unsigned long pfn, pgprot_t prot)
>  }
>  
>  #ifdef CONFIG_TRANSPARENT_HUGEPAGE
> -static void __init pmd_basic_tests(unsigned long pfn, int idx)
> +static void __init pmd_basic_tests(struct pgtable_debug_args *args, int idx)
>  {
>  	pgprot_t prot = protection_map[idx];
>  	unsigned long val = idx, *ptr = &val;
> @@ -183,7 +183,7 @@ static void __init pmd_basic_tests(unsigned long pfn, int idx)
>  		return;
>  
>  	pr_debug("Validating PMD basic (%pGv)\n", ptr);
> -	pmd = pfn_pmd(pfn, prot);
> +	pmd = pfn_pmd(args->fixed_pmd_pfn, prot);
>  
>  	/*
>  	 * This test needs to be executed after the given page table entry
> @@ -295,7 +295,7 @@ static void __init pmd_savedwrite_tests(unsigned long pfn, pgprot_t prot)
>  }
>  
>  #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
> -static void __init pud_basic_tests(struct mm_struct *mm, unsigned long pfn, int idx)
> +static void __init pud_basic_tests(struct pgtable_debug_args *args, int idx)
>  {
>  	pgprot_t prot = protection_map[idx];
>  	unsigned long val = idx, *ptr = &val;
> @@ -305,7 +305,7 @@ static void __init pud_basic_tests(struct mm_struct *mm, unsigned long pfn, int
>  		return;
>  
>  	pr_debug("Validating PUD basic (%pGv)\n", ptr);
> -	pud = pfn_pud(pfn, prot);
> +	pud = pfn_pud(args->fixed_pud_pfn, prot);
>  
>  	/*
>  	 * This test needs to be executed after the given page table entry
> @@ -326,7 +326,7 @@ static void __init pud_basic_tests(struct mm_struct *mm, unsigned long pfn, int
>  	WARN_ON(pud_dirty(pud_wrprotect(pud_mkclean(pud))));
>  	WARN_ON(!pud_dirty(pud_wrprotect(pud_mkdirty(pud))));
>  
> -	if (mm_pmd_folded(mm))
> +	if (mm_pmd_folded(args->mm))
>  		return;
>  
>  	/*
> @@ -403,7 +403,7 @@ static void __init pud_leaf_tests(unsigned long pfn, pgprot_t prot)
>  	WARN_ON(!pud_leaf(pud));
>  }
>  #else  /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */
> -static void __init pud_basic_tests(struct mm_struct *mm, unsigned long pfn, int idx) { }
> +static void __init pud_basic_tests(struct pgtable_debug_args *args, int idx) { }
>  static void __init pud_advanced_tests(struct mm_struct *mm,
>  				      struct vm_area_struct *vma, pud_t *pudp,
>  				      unsigned long pfn, unsigned long vaddr,
> @@ -413,8 +413,8 @@ static void __init pud_advanced_tests(struct mm_struct *mm,
>  static void __init pud_leaf_tests(unsigned long pfn, pgprot_t prot) { }
>  #endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */
>  #else  /* !CONFIG_TRANSPARENT_HUGEPAGE */
> -static void __init pmd_basic_tests(unsigned long pfn, int idx) { }
> -static void __init pud_basic_tests(struct mm_struct *mm, unsigned long pfn, int idx) { }
> +static void __init pmd_basic_tests(struct pgtable_debug_args *args, int idx) { }
> +static void __init pud_basic_tests(struct pgtable_debug_args *args, int idx) { }
>  static void __init pmd_advanced_tests(struct mm_struct *mm,
>  				      struct vm_area_struct *vma, pmd_t *pmdp,
>  				      unsigned long pfn, unsigned long vaddr,
> @@ -475,7 +475,7 @@ static void __init pmd_huge_tests(pmd_t *pmdp, unsigned long pfn, pgprot_t prot)
>  static void __init pud_huge_tests(pud_t *pudp, unsigned long pfn, pgprot_t prot) { }
>  #endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */
>  
> -static void __init p4d_basic_tests(unsigned long pfn, pgprot_t prot)
> +static void __init p4d_basic_tests(void)
>  {
>  	p4d_t p4d;
>  
> @@ -484,7 +484,7 @@ static void __init p4d_basic_tests(unsigned long pfn, pgprot_t prot)
>  	WARN_ON(!p4d_same(p4d, p4d));
>  }
>  
> -static void __init pgd_basic_tests(unsigned long pfn, pgprot_t prot)
> +static void __init pgd_basic_tests(void)
>  {
>  	pgd_t pgd;
>  
> @@ -889,7 +889,7 @@ static void __init swap_migration_tests(void)
>  }
>  
>  #ifdef CONFIG_HUGETLB_PAGE
> -static void __init hugetlb_basic_tests(unsigned long pfn, pgprot_t prot)
> +static void __init hugetlb_basic_tests(struct pgtable_debug_args *args)
>  {
>  	struct page *page;
>  	pte_t pte;
> @@ -899,21 +899,21 @@ static void __init hugetlb_basic_tests(unsigned long pfn, pgprot_t prot)
>  	 * Accessing the page associated with the pfn is safe here,
>  	 * as it was previously derived from a real kernel symbol.
>  	 */
> -	page = pfn_to_page(pfn);
> -	pte = mk_huge_pte(page, prot);
> +	page = pfn_to_page(args->fixed_pmd_pfn);
> +	pte = mk_huge_pte(page, args->page_prot);
>  
>  	WARN_ON(!huge_pte_dirty(huge_pte_mkdirty(pte)));
>  	WARN_ON(!huge_pte_write(huge_pte_mkwrite(huge_pte_wrprotect(pte))));
>  	WARN_ON(huge_pte_write(huge_pte_wrprotect(huge_pte_mkwrite(pte))));
>  
>  #ifdef CONFIG_ARCH_WANT_GENERAL_HUGETLB
> -	pte = pfn_pte(pfn, prot);
> +	pte = pfn_pte(args->fixed_pmd_pfn, args->page_prot);
>  
>  	WARN_ON(!pte_huge(pte_mkhuge(pte)));
>  #endif /* CONFIG_ARCH_WANT_GENERAL_HUGETLB */
>  }
>  #else  /* !CONFIG_HUGETLB_PAGE */
> -static void __init hugetlb_basic_tests(unsigned long pfn, pgprot_t prot) { }
> +static void __init hugetlb_basic_tests(struct pgtable_debug_args *args) { }
>  #endif /* CONFIG_HUGETLB_PAGE */
>  
>  #ifdef CONFIG_TRANSPARENT_HUGEPAGE
> @@ -1157,7 +1157,7 @@ static int __init debug_vm_pgtable(void)
>  	pgprot_t prot, protnone;
>  	phys_addr_t paddr;
>  	unsigned long vaddr, pte_aligned, pmd_aligned;
> -	unsigned long pud_aligned, p4d_aligned, pgd_aligned;
> +	unsigned long pud_aligned;
>  	spinlock_t *ptl = NULL;
>  	int idx, ret;
>  
> @@ -1200,8 +1200,6 @@ static int __init debug_vm_pgtable(void)
>  	pte_aligned = (paddr & PAGE_MASK) >> PAGE_SHIFT;
>  	pmd_aligned = (paddr & PMD_MASK) >> PAGE_SHIFT;
>  	pud_aligned = (paddr & PUD_MASK) >> PAGE_SHIFT;
> -	p4d_aligned = (paddr & P4D_MASK) >> PAGE_SHIFT;
> -	pgd_aligned = (paddr & PGDIR_MASK) >> PAGE_SHIFT;
>  	WARN_ON(!pfn_valid(pte_aligned));
>  
>  	pgdp = pgd_offset(mm, vaddr);
> @@ -1235,9 +1233,9 @@ static int __init debug_vm_pgtable(void)
>  	 * given page table entry.
>  	 */
>  	for (idx = 0; idx < ARRAY_SIZE(protection_map); idx++) {
> -		pte_basic_tests(pte_aligned, idx);
> -		pmd_basic_tests(pmd_aligned, idx);
> -		pud_basic_tests(mm, pud_aligned, idx);
> +		pte_basic_tests(&args, idx);
> +		pmd_basic_tests(&args, idx);
> +		pud_basic_tests(&args, idx);
>  	}
>  
>  	/*
> @@ -1247,8 +1245,9 @@ static int __init debug_vm_pgtable(void)
>  	 * the above iteration for now to save some test execution
>  	 * time.
>  	 */
> -	p4d_basic_tests(p4d_aligned, prot);
> -	pgd_basic_tests(pgd_aligned, prot);
> +	p4d_basic_tests();
> +	pgd_basic_tests();
> +	hugetlb_basic_tests(&args);
>  
>  	pmd_leaf_tests(pmd_aligned, prot);
>  	pud_leaf_tests(pud_aligned, prot);
> @@ -1277,8 +1276,6 @@ static int __init debug_vm_pgtable(void)
>  	pmd_thp_tests(pmd_aligned, prot);
>  	pud_thp_tests(pud_aligned, prot);
>  
> -	hugetlb_basic_tests(pte_aligned, prot);
> -
>  	/*
>  	 * Page table modifying tests. They need to hold
>  	 * proper page table lock.
>