--- v9
+++ v6
@@ -1,153 +1,35 @@
-These functions are no longer necessary. Remove them and cleanup
-Documentation referencing them.
+Part of the conversions to replace pgtable pte constructor/destructors with
+ptdesc equivalents.
+Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Acked-by: Mike Rapoport (IBM) <rppt@kernel.org>
-Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
---
- 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(-)
+ arch/sparc/mm/srmmu.c | 5 +++--
+ 1 file changed, 3 insertions(+), 2 deletions(-)
-diff --git a/Documentation/mm/split_page_table_lock.rst b/Documentation/mm/split_page_table_lock.rst
-index a834fad9de12..e4f6972eb6c0 100644
---- a/Documentation/mm/split_page_table_lock.rst
-+++ b/Documentation/mm/split_page_table_lock.rst
-@@ -58,7 +58,7 @@ Support of split page table lock by an architecture
- ===================================================
+diff --git a/arch/sparc/mm/srmmu.c b/arch/sparc/mm/srmmu.c
+index 13f027afc875..8393faa3e596 100644
+--- a/arch/sparc/mm/srmmu.c
++++ b/arch/sparc/mm/srmmu.c
+@@ -355,7 +355,8 @@ pgtable_t pte_alloc_one(struct mm_struct *mm)
+ return NULL;
+ page = pfn_to_page(__nocache_pa((unsigned long)ptep) >> PAGE_SHIFT);
+ spin_lock(&mm->page_table_lock);
+- if (page_ref_inc_return(page) == 2 && !pgtable_pte_page_ctor(page)) {
++ if (page_ref_inc_return(page) == 2 &&
++ !pagetable_pte_ctor(page_ptdesc(page))) {
+ page_ref_dec(page);
+ ptep = NULL;
+ }
+@@ -371,7 +372,7 @@ void pte_free(struct mm_struct *mm, pgtable_t ptep)
+ page = pfn_to_page(__nocache_pa((unsigned long)ptep) >> PAGE_SHIFT);
+ spin_lock(&mm->page_table_lock);
+ if (page_ref_dec_return(page) == 1)
+- pgtable_pte_page_dtor(page);
++ pagetable_pte_dtor(page_ptdesc(page));
+ spin_unlock(&mm->page_table_lock);
- 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
-@@ -68,8 +68,8 @@ 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
-@@ -77,7 +77,7 @@ 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
-@@ -97,7 +97,7 @@ 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 6310e0c59efe..6a95dfed4957 100644
---- a/include/linux/mm.h
-+++ b/include/linux/mm.h
-@@ -2932,11 +2932,6 @@ 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);
-@@ -2946,11 +2941,6 @@ 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));
--}
--
- pte_t *__pte_offset_map(pmd_t *pmd, unsigned long addr, pmd_t *pmdvalp);
- static inline pte_t *pte_offset_map(pmd_t *pmd, unsigned long addr)
- {
-@@ -3057,11 +3047,6 @@ 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);
-@@ -3071,11 +3056,6 @@ 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
+ srmmu_free_nocache(ptep, SRMMU_PTE_TABLE_SIZE);
--
2.40.1