linux-kernel - Re: [PATCH V2] mm/page_table_check: Drop all redundant EXPORT

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Date:   Thu, 21 Apr 2022 11:47:57 -0400
From:   Pasha Tatashin <pasha.tatashin@...een.com>
To:     Anshuman Khandual <anshuman.khandual@....com>
Cc:     linux-mm <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2] mm/page_table_check: Drop all redundant EXPORT_SYMBOL()

On Thu, Apr 21, 2022 at 3:05 AM Anshuman Khandual
<anshuman.khandual@....com> wrote:
>
> Function definitions need not be exported via EXPORT_SYMBOL() mechanism. In
> this case these functions just get called only inside their wrappers. Even
> __page_table_check_zero() gets called without such an export. Just drop all
> these redundant EXPORT_SYMBOL().
>
> Cc: Pasha Tatashin <pasha.tatashin@...een.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: linux-mm@...ck.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>

Acked-by: Pasha Tatashin <pasha.tatashin@...een.com>

Thank you,
Pasha

> ---
> This applies on v5.18-rc3
>
> Changes in V2:
>
> - Restored EXPORT_SYMBOL for __page_table_check_pte_set() per Pasha
>
>  mm/page_table_check.c | 5 -----
>  1 file changed, 5 deletions(-)
>
> diff --git a/mm/page_table_check.c b/mm/page_table_check.c
> index 2458281bff89..627c5025d786 100644
> --- a/mm/page_table_check.c
> +++ b/mm/page_table_check.c
> @@ -167,7 +167,6 @@ void __page_table_check_pte_clear(struct mm_struct *mm, unsigned long addr,
>                                        PAGE_SIZE >> PAGE_SHIFT);
>         }
>  }
> -EXPORT_SYMBOL(__page_table_check_pte_clear);
>
>  void __page_table_check_pmd_clear(struct mm_struct *mm, unsigned long addr,
>                                   pmd_t pmd)
> @@ -180,7 +179,6 @@ void __page_table_check_pmd_clear(struct mm_struct *mm, unsigned long addr,
>                                        PMD_PAGE_SIZE >> PAGE_SHIFT);
>         }
>  }
> -EXPORT_SYMBOL(__page_table_check_pmd_clear);
>
>  void __page_table_check_pud_clear(struct mm_struct *mm, unsigned long addr,
>                                   pud_t pud)
> @@ -193,7 +191,6 @@ void __page_table_check_pud_clear(struct mm_struct *mm, unsigned long addr,
>                                        PUD_PAGE_SIZE >> PAGE_SHIFT);
>         }
>  }
> -EXPORT_SYMBOL(__page_table_check_pud_clear);
>
>  void __page_table_check_pte_set(struct mm_struct *mm, unsigned long addr,
>                                 pte_t *ptep, pte_t pte)
> @@ -223,7 +220,6 @@ void __page_table_check_pmd_set(struct mm_struct *mm, unsigned long addr,
>                                      pmd_write(pmd));
>         }
>  }
> -EXPORT_SYMBOL(__page_table_check_pmd_set);
>
>  void __page_table_check_pud_set(struct mm_struct *mm, unsigned long addr,
>                                 pud_t *pudp, pud_t pud)
> @@ -238,7 +234,6 @@ void __page_table_check_pud_set(struct mm_struct *mm, unsigned long addr,
>                                      pud_write(pud));
>         }
>  }
> -EXPORT_SYMBOL(__page_table_check_pud_set);
>
>  void __page_table_check_pte_clear_range(struct mm_struct *mm,
>                                         unsigned long addr,
> --
> 2.20.1
>