diff options
Diffstat (limited to 'arch/s390/mm/pgalloc.c')
| -rw-r--r-- | arch/s390/mm/pgalloc.c | 39 |
1 files changed, 31 insertions, 8 deletions
diff --git a/arch/s390/mm/pgalloc.c b/arch/s390/mm/pgalloc.c index e2565d2d0c32..995f78532cc2 100644 --- a/arch/s390/mm/pgalloc.c +++ b/arch/s390/mm/pgalloc.c @@ -137,6 +137,29 @@ static inline unsigned int atomic_xor_bits(atomic_t *v, unsigned int bits) return new; } +#ifdef CONFIG_PGSTE + +struct page *page_table_alloc_pgste(struct mm_struct *mm) +{ + struct page *page; + unsigned long *table; + + page = alloc_page(GFP_KERNEL|__GFP_REPEAT); + if (page) { + table = (unsigned long *) page_to_phys(page); + clear_table(table, _PAGE_INVALID, PAGE_SIZE/2); + clear_table(table + PTRS_PER_PTE, 0, PAGE_SIZE/2); + } + return page; +} + +void page_table_free_pgste(struct page *page) +{ + __free_page(page); +} + +#endif /* CONFIG_PGSTE */ + /* * page table entry allocation/free routines. */ @@ -149,7 +172,7 @@ unsigned long *page_table_alloc(struct mm_struct *mm) /* Try to get a fragment of a 4K page as a 2K page table */ if (!mm_alloc_pgste(mm)) { table = NULL; - spin_lock_bh(&mm->context.list_lock); + spin_lock_bh(&mm->context.pgtable_lock); if (!list_empty(&mm->context.pgtable_list)) { page = list_first_entry(&mm->context.pgtable_list, struct page, lru); @@ -164,7 +187,7 @@ unsigned long *page_table_alloc(struct mm_struct *mm) list_del(&page->lru); } } - spin_unlock_bh(&mm->context.list_lock); + spin_unlock_bh(&mm->context.pgtable_lock); if (table) return table; } @@ -187,9 +210,9 @@ unsigned long *page_table_alloc(struct mm_struct *mm) /* Return the first 2K fragment of the page */ atomic_set(&page->_mapcount, 1); clear_table(table, _PAGE_INVALID, PAGE_SIZE); - spin_lock_bh(&mm->context.list_lock); + spin_lock_bh(&mm->context.pgtable_lock); list_add(&page->lru, &mm->context.pgtable_list); - spin_unlock_bh(&mm->context.list_lock); + spin_unlock_bh(&mm->context.pgtable_lock); } return table; } @@ -203,13 +226,13 @@ void page_table_free(struct mm_struct *mm, unsigned long *table) if (!mm_alloc_pgste(mm)) { /* Free 2K page table fragment of a 4K page */ bit = (__pa(table) & ~PAGE_MASK)/(PTRS_PER_PTE*sizeof(pte_t)); - spin_lock_bh(&mm->context.list_lock); + spin_lock_bh(&mm->context.pgtable_lock); mask = atomic_xor_bits(&page->_mapcount, 1U << bit); if (mask & 3) list_add(&page->lru, &mm->context.pgtable_list); else list_del(&page->lru); - spin_unlock_bh(&mm->context.list_lock); + spin_unlock_bh(&mm->context.pgtable_lock); if (mask != 0) return; } @@ -235,13 +258,13 @@ void page_table_free_rcu(struct mmu_gather *tlb, unsigned long *table, return; } bit = (__pa(table) & ~PAGE_MASK) / (PTRS_PER_PTE*sizeof(pte_t)); - spin_lock_bh(&mm->context.list_lock); + spin_lock_bh(&mm->context.pgtable_lock); mask = atomic_xor_bits(&page->_mapcount, 0x11U << bit); if (mask & 3) list_add_tail(&page->lru, &mm->context.pgtable_list); else list_del(&page->lru); - spin_unlock_bh(&mm->context.list_lock); + spin_unlock_bh(&mm->context.pgtable_lock); table = (unsigned long *) (__pa(table) | (1U << bit)); tlb_remove_table(tlb, table); } |