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Date: Wed, 21 Jul 2021 11:27:25 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: Gavin Shan <gshan@...hat.com>, linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org, catalin.marinas@....com,
will@...nel.org, akpm@...ux-foundation.org, chuhu@...hat.com,
shan.gavin@...il.com
Subject: Re: [PATCH v3 02/12] mm/debug_vm_pgtable: Use struct
pgtable_debug_args in basic tests
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@...hat.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.
>
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