diff options
| author | Will Deacon <will@kernel.org> | 2020-04-14 23:40:10 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-05-14 00:32:00 +0200 |
| commit | 3f407976ac2953116cb8880a7a18b63bcc81829d (patch) | |
| tree | a6c8c04671658ba8deb6a6775cec51d25f02622a /arch/sparc/mm | |
| parent | sparc32: mm: Restructure sparc32 MMU page-table layout (diff) | |
| download | linux-3f407976ac2953116cb8880a7a18b63bcc81829d.tar.xz linux-3f407976ac2953116cb8880a7a18b63bcc81829d.zip | |
sparc32: mm: Change pgtable_t type to pte_t * instead of struct page *
Change the 'pgtable_t' type for sparc32 so that it represents the uncached
virtual address of the PTE table, rather than the underlying 'struct page'.
This allows us to free page table allocations smaller than a page.
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/mm')
| -rw-r--r-- | arch/sparc/mm/srmmu.c | 29 |
1 files changed, 9 insertions, 20 deletions
diff --git a/arch/sparc/mm/srmmu.c b/arch/sparc/mm/srmmu.c index 50da4bcdd6fa..c861c0f0df73 100644 --- a/arch/sparc/mm/srmmu.c +++ b/arch/sparc/mm/srmmu.c @@ -140,12 +140,6 @@ void pmd_set(pmd_t *pmdp, pte_t *ptep) set_pte((pte_t *)&pmd_val(*pmdp), __pte(SRMMU_ET_PTD | ptp)); } -void pmd_populate(struct mm_struct *mm, pmd_t *pmdp, struct page *ptep) -{ - unsigned long ptp = page_to_pfn(ptep) << (PAGE_SHIFT-4); /* watch for overflow */ - set_pte((pte_t *)&pmd_val(*pmdp), __pte(SRMMU_ET_PTD | ptp)); -} - /* Find an entry in the third-level page table.. */ pte_t *pte_offset_kernel(pmd_t *dir, unsigned long address) { @@ -364,31 +358,26 @@ pgd_t *get_pgd_fast(void) */ pgtable_t pte_alloc_one(struct mm_struct *mm) { - unsigned long pte; + pte_t *ptep; struct page *page; - if ((pte = (unsigned long)pte_alloc_one_kernel(mm)) == 0) + if ((ptep = pte_alloc_one_kernel(mm)) == 0) return NULL; - page = pfn_to_page(__nocache_pa(pte) >> PAGE_SHIFT); + page = pfn_to_page(__nocache_pa((unsigned long)ptep) >> PAGE_SHIFT); if (!pgtable_pte_page_ctor(page)) { __free_page(page); return NULL; } - return page; + return ptep; } -void pte_free(struct mm_struct *mm, pgtable_t pte) +void pte_free(struct mm_struct *mm, pgtable_t ptep) { - unsigned long p; - - pgtable_pte_page_dtor(pte); - p = (unsigned long)page_address(pte); /* Cached address (for test) */ - if (p == 0) - BUG(); - p = page_to_pfn(pte) << PAGE_SHIFT; /* Physical address */ + struct page *page; - /* free non cached virtual address*/ - srmmu_free_nocache(__nocache_va(p), SRMMU_PTE_TABLE_SIZE); + page = pfn_to_page(__nocache_pa((unsigned long)ptep) >> PAGE_SHIFT); + pgtable_pte_page_dtor(page); + srmmu_free_nocache(ptep, SRMMU_PTE_TABLE_SIZE); } /* context handling - a dynamically sized pool is used */ |