[PATCH v4 34/34] mm: Remove pgtable_{pmd, pte}_page_{ctor, dtor}() wrappers
Mike Rapoport
rppt at kernel.org
Thu Jun 15 01:23:33 AEST 2023
On Mon, Jun 12, 2023 at 02:04:23PM -0700, Vishal Moola (Oracle) wrote:
> These functions are no longer necessary. Remove them and cleanup
> Documentation referencing them.
>
> Signed-off-by: Vishal Moola (Oracle) <vishal.moola at gmail.com>
I've found one stale reference in riscv:
$ git grep -n pgtable_pmd_page_ctor
arch/riscv/mm/init.c:440: BUG_ON(!vaddr || !pgtable_pmd_page_ctor(virt_to_page(vaddr)));
Otherwise
Acked-by: Mike Rapoport (IBM) <rppt at kernel.org>
> ---
> Documentation/mm/split_page_table_lock.rst | 12 +++++------
> .../zh_CN/mm/split_page_table_lock.rst | 14 ++++++-------
> include/linux/mm.h | 20 -------------------
> 3 files changed, 13 insertions(+), 33 deletions(-)
>
> diff --git a/Documentation/mm/split_page_table_lock.rst b/Documentation/mm/split_page_table_lock.rst
> index 50ee0dfc95be..4bffec728340 100644
> --- a/Documentation/mm/split_page_table_lock.rst
> +++ b/Documentation/mm/split_page_table_lock.rst
> @@ -53,7 +53,7 @@ Support of split page table lock by an architecture
> ===================================================
>
> There's no need in special enabling of PTE split page table lock: everything
> -required is done by pgtable_pte_page_ctor() and pgtable_pte_page_dtor(), which
> +required is done by pagetable_pte_ctor() and pagetable_pte_dtor(), which
> must be called on PTE table allocation / freeing.
>
> Make sure the architecture doesn't use slab allocator for page table
> @@ -63,8 +63,8 @@ This field shares storage with page->ptl.
> PMD split lock only makes sense if you have more than two page table
> levels.
>
> -PMD split lock enabling requires pgtable_pmd_page_ctor() call on PMD table
> -allocation and pgtable_pmd_page_dtor() on freeing.
> +PMD split lock enabling requires pagetable_pmd_ctor() call on PMD table
> +allocation and pagetable_pmd_dtor() on freeing.
>
> Allocation usually happens in pmd_alloc_one(), freeing in pmd_free() and
> pmd_free_tlb(), but make sure you cover all PMD table allocation / freeing
> @@ -72,7 +72,7 @@ paths: i.e X86_PAE preallocate few PMDs on pgd_alloc().
>
> With everything in place you can set CONFIG_ARCH_ENABLE_SPLIT_PMD_PTLOCK.
>
> -NOTE: pgtable_pte_page_ctor() and pgtable_pmd_page_ctor() can fail -- it must
> +NOTE: pagetable_pte_ctor() and pagetable_pmd_ctor() can fail -- it must
> be handled properly.
>
> page->ptl
> @@ -92,7 +92,7 @@ trick:
> split lock with enabled DEBUG_SPINLOCK or DEBUG_LOCK_ALLOC, but costs
> one more cache line for indirect access;
>
> -The spinlock_t allocated in pgtable_pte_page_ctor() for PTE table and in
> -pgtable_pmd_page_ctor() for PMD table.
> +The spinlock_t allocated in pagetable_pte_ctor() for PTE table and in
> +pagetable_pmd_ctor() for PMD table.
>
> Please, never access page->ptl directly -- use appropriate helper.
> diff --git a/Documentation/translations/zh_CN/mm/split_page_table_lock.rst b/Documentation/translations/zh_CN/mm/split_page_table_lock.rst
> index 4fb7aa666037..a2c288670a24 100644
> --- a/Documentation/translations/zh_CN/mm/split_page_table_lock.rst
> +++ b/Documentation/translations/zh_CN/mm/split_page_table_lock.rst
> @@ -56,16 +56,16 @@ Hugetlb特定的辅助函数:
> 架构对分页表锁的支持
> ====================
>
> -没有必要特别启用PTE分页表锁：所有需要的东西都由pgtable_pte_page_ctor()
> -和pgtable_pte_page_dtor()完成，它们必须在PTE表分配/释放时被调用。
> +没有必要特别启用PTE分页表锁：所有需要的东西都由pagetable_pte_ctor()
> +和pagetable_pte_dtor()完成，它们必须在PTE表分配/释放时被调用。
>
> 确保架构不使用slab分配器来分配页表：slab使用page->slab_cache来分配其页
> 面。这个区域与page->ptl共享存储。
>
> PMD分页锁只有在你有两个以上的页表级别时才有意义。
>
> -启用PMD分页锁需要在PMD表分配时调用pgtable_pmd_page_ctor()，在释放时调
> -用pgtable_pmd_page_dtor()。
> +启用PMD分页锁需要在PMD表分配时调用pagetable_pmd_ctor()，在释放时调
> +用pagetable_pmd_dtor()。
>
> 分配通常发生在pmd_alloc_one()中，释放发生在pmd_free()和pmd_free_tlb()
> 中，但要确保覆盖所有的PMD表分配/释放路径：即X86_PAE在pgd_alloc()中预先
> @@ -73,7 +73,7 @@ PMD分页锁只有在你有两个以上的页表级别时才有意义。
>
> 一切就绪后，你可以设置CONFIG_ARCH_ENABLE_SPLIT_PMD_PTLOCK。
>
> -注意：pgtable_pte_page_ctor()和pgtable_pmd_page_ctor()可能失败--必
> +注意：pagetable_pte_ctor()和pagetable_pmd_ctor()可能失败--必
> 须正确处理。
>
> page->ptl
> @@ -90,7 +90,7 @@ page->ptl用于访问分割页表锁，其中'page'是包含该表的页面struc
> 的指针并动态分配它。这允许在启用DEBUG_SPINLOCK或DEBUG_LOCK_ALLOC的
> 情况下使用分页锁，但由于间接访问而多花了一个缓存行。
>
> -PTE表的spinlock_t分配在pgtable_pte_page_ctor()中，PMD表的spinlock_t
> -分配在pgtable_pmd_page_ctor()中。
> +PTE表的spinlock_t分配在pagetable_pte_ctor()中，PMD表的spinlock_t
> +分配在pagetable_pmd_ctor()中。
>
> 请不要直接访问page->ptl - -使用适当的辅助函数。
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index dc211c43610b..6d83483cf186 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -2897,11 +2897,6 @@ static inline bool pagetable_pte_ctor(struct ptdesc *ptdesc)
> return true;
> }
>
> -static inline bool pgtable_pte_page_ctor(struct page *page)
> -{
> - return pagetable_pte_ctor(page_ptdesc(page));
> -}
> -
> static inline void pagetable_pte_dtor(struct ptdesc *ptdesc)
> {
> struct folio *folio = ptdesc_folio(ptdesc);
> @@ -2911,11 +2906,6 @@ static inline void pagetable_pte_dtor(struct ptdesc *ptdesc)
> lruvec_stat_sub_folio(folio, NR_PAGETABLE);
> }
>
> -static inline void pgtable_pte_page_dtor(struct page *page)
> -{
> - pagetable_pte_dtor(page_ptdesc(page));
> -}
> -
> #define pte_offset_map_lock(mm, pmd, address, ptlp) \
> ({ \
> spinlock_t *__ptl = pte_lockptr(mm, pmd); \
> @@ -3006,11 +2996,6 @@ static inline bool pagetable_pmd_ctor(struct ptdesc *ptdesc)
> return true;
> }
>
> -static inline bool pgtable_pmd_page_ctor(struct page *page)
> -{
> - return pagetable_pmd_ctor(page_ptdesc(page));
> -}
> -
> static inline void pagetable_pmd_dtor(struct ptdesc *ptdesc)
> {
> struct folio *folio = ptdesc_folio(ptdesc);
> @@ -3020,11 +3005,6 @@ static inline void pagetable_pmd_dtor(struct ptdesc *ptdesc)
> lruvec_stat_sub_folio(folio, NR_PAGETABLE);
> }
>
> -static inline void pgtable_pmd_page_dtor(struct page *page)
> -{
> - pagetable_pmd_dtor(page_ptdesc(page));
> -}
> -
> /*
> * No scalability reason to split PUD locks yet, but follow the same pattern
> * as the PMD locks to make it easier if we decide to. The VM should not be
> --
> 2.40.1
>
>
--
Sincerely yours,
Mike.
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