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Date: Thu, 1 Apr 2021 20:35:53 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: Shixin Liu <liushixin2@...wei.com>,
Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next 2/3] mm/debug_vm_pgtable: Move {pmd/pud}_huge_tests
out of CONFIG_TRANSPARENT_HUGEPAGE
On 4/1/21 7:53 AM, Shixin Liu wrote:
> The functions {pmd/pud}_set_huge and {pmd/pud}_clear_huge is not depend on THP.
s/is not depend/are not dependent/
> But now if we want to test these functions, we have to enable THP. So move
> {pmd/pud}_huge_tests out of CONFIG_TRANSPARENT_HUGEPAGE.
Please drop the second sentence here.
>
> Signed-off-by: Shixin Liu <liushixin2@...wei.com>
> ---
> mm/debug_vm_pgtable.c | 91 +++++++++++++++++++------------------------
> 1 file changed, 39 insertions(+), 52 deletions(-)
>
> diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c
> index a5c71a94e804..c379bbe42c2a 100644
> --- a/mm/debug_vm_pgtable.c
> +++ b/mm/debug_vm_pgtable.c
> @@ -242,29 +242,6 @@ static void __init pmd_leaf_tests(unsigned long pfn, pgprot_t prot)
> WARN_ON(!pmd_leaf(pmd));
> }
>
> -#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
> -static void __init pmd_huge_tests(pmd_t *pmdp, unsigned long pfn, pgprot_t prot)
> -{
> - pmd_t pmd;
> -
> - if (!arch_vmap_pmd_supported(prot))
> - return;
> -
> - pr_debug("Validating PMD huge\n");
> - /*
> - * X86 defined pmd_set_huge() verifies that the given
> - * PMD is not a populated non-leaf entry.
> - */
> - WRITE_ONCE(*pmdp, __pmd(0));
> - WARN_ON(!pmd_set_huge(pmdp, __pfn_to_phys(pfn), prot));
> - WARN_ON(!pmd_clear_huge(pmdp));
> - pmd = READ_ONCE(*pmdp);
> - WARN_ON(!pmd_none(pmd));
> -}
> -#else /* CONFIG_HAVE_ARCH_HUGE_VMAP */
> -static void __init pmd_huge_tests(pmd_t *pmdp, unsigned long pfn, pgprot_t prot) { }
> -#endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */
> -
> static void __init pmd_savedwrite_tests(unsigned long pfn, pgprot_t prot)
> {
> pmd_t pmd = pfn_pmd(pfn, prot);
> @@ -379,30 +356,6 @@ static void __init pud_leaf_tests(unsigned long pfn, pgprot_t prot)
> pud = pud_mkhuge(pud);
> WARN_ON(!pud_leaf(pud));
> }
> -
> -#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
> -static void __init pud_huge_tests(pud_t *pudp, unsigned long pfn, pgprot_t prot)
> -{
> - pud_t pud;
> -
> - if (!arch_vmap_pud_supported(prot))
> - return;
> -
> - pr_debug("Validating PUD huge\n");
> - /*
> - * X86 defined pud_set_huge() verifies that the given
> - * PUD is not a populated non-leaf entry.
> - */
> - WRITE_ONCE(*pudp, __pud(0));
> - WARN_ON(!pud_set_huge(pudp, __pfn_to_phys(pfn), prot));
> - WARN_ON(!pud_clear_huge(pudp));
> - pud = READ_ONCE(*pudp);
> - WARN_ON(!pud_none(pud));
> -}
> -#else /* !CONFIG_HAVE_ARCH_HUGE_VMAP */
> -static void __init pud_huge_tests(pud_t *pudp, unsigned long pfn, pgprot_t prot) { }
> -#endif /* !CONFIG_HAVE_ARCH_HUGE_VMAP */
> -
> #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_advanced_tests(struct mm_struct *mm,
> @@ -412,9 +365,6 @@ static void __init pud_advanced_tests(struct mm_struct *mm,
> {
> }
> static void __init pud_leaf_tests(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_TRANSPARENT_HUGEPAGE_PUD */
> #else /* !CONFIG_TRANSPARENT_HUGEPAGE */
> static void __init pmd_basic_tests(unsigned long pfn, int idx) { }
> @@ -433,14 +383,51 @@ static void __init pud_advanced_tests(struct mm_struct *mm,
> }
> static void __init pmd_leaf_tests(unsigned long pfn, pgprot_t prot) { }
> static void __init pud_leaf_tests(unsigned long pfn, pgprot_t prot) { }
> +static void __init pmd_savedwrite_tests(unsigned long pfn, pgprot_t prot) { }
> +#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
> +
> +#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
> static void __init pmd_huge_tests(pmd_t *pmdp, unsigned long pfn, pgprot_t prot)
> {
> + pmd_t pmd;
> +
> + if (!arch_vmap_pmd_supported(prot))
> + return;
> +
> + pr_debug("Validating PMD huge\n");
> + /*
> + * X86 defined pmd_set_huge() verifies that the given
> + * PMD is not a populated non-leaf entry.
> + */
> + WRITE_ONCE(*pmdp, __pmd(0));
> + WARN_ON(!pmd_set_huge(pmdp, __pfn_to_phys(pfn), prot));
> + WARN_ON(!pmd_clear_huge(pmdp));
> + pmd = READ_ONCE(*pmdp);
> + WARN_ON(!pmd_none(pmd));
> }
> +
> static void __init pud_huge_tests(pud_t *pudp, unsigned long pfn, pgprot_t prot)
> {
> + pud_t pud;
> +
> + if (!arch_vmap_pud_supported(prot))
> + return;
> +
> + pr_debug("Validating PUD huge\n");
> + /*
> + * X86 defined pud_set_huge() verifies that the given
> + * PUD is not a populated non-leaf entry.
> + */
> + WRITE_ONCE(*pudp, __pud(0));
> + WARN_ON(!pud_set_huge(pudp, __pfn_to_phys(pfn), prot));
> + WARN_ON(!pud_clear_huge(pudp));
> + pud = READ_ONCE(*pudp);
> + WARN_ON(!pud_none(pud));
> }
> -static void __init pmd_savedwrite_tests(unsigned long pfn, pgprot_t prot) { }
> -#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
> +#else /* !CONFIG_HAVE_ARCH_HUGE_VMAP */
> +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)
> {
>
This overall does make sense. Will further look into this but later on.
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