On Mon, Jun 12, 2023 at 02:04:13PM -0700, Vishal Moola (Oracle) wrote:
> As part of the conversions to replace pgtable constructor/destructors with
> ptdesc equivalents, convert various page table functions to use ptdescs.
>
> Some of the functions use the *get*page*() helper functions. Convert
> these to use pagetable_alloc() and ptdesc_address() instead to help
> standardize page tables further.
>
> Signed-off-by: Vishal Moola (Oracle) <vishal.moola@xxxxxxxxx>
Acked-by: Mike Rapoport (IBM) <rppt@xxxxxxxxxx>
> ---
> arch/loongarch/include/asm/pgalloc.h | 27 +++++++++++++++------------
> arch/loongarch/mm/pgtable.c | 7 ++++---
> 2 files changed, 19 insertions(+), 15 deletions(-)
>
> diff --git a/arch/loongarch/include/asm/pgalloc.h b/arch/loongarch/include/asm/pgalloc.h
> index af1d1e4a6965..70bb3bdd201e 100644
> --- a/arch/loongarch/include/asm/pgalloc.h
> +++ b/arch/loongarch/include/asm/pgalloc.h
> @@ -45,9 +45,9 @@ extern void pagetable_init(void);
> extern pgd_t *pgd_alloc(struct mm_struct *mm);
>
> #define __pte_free_tlb(tlb, pte, address) \
> -do { \
> - pgtable_pte_page_dtor(pte); \
> - tlb_remove_page((tlb), pte); \
> +do { \
> + pagetable_pte_dtor(page_ptdesc(pte)); \
> + tlb_remove_page_ptdesc((tlb), page_ptdesc(pte)); \
> } while (0)
>
> #ifndef __PAGETABLE_PMD_FOLDED
> @@ -55,18 +55,18 @@ do { \
> static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
> {
> pmd_t *pmd;
> - struct page *pg;
> + struct ptdesc *ptdesc;
>
> - pg = alloc_page(GFP_KERNEL_ACCOUNT);
> - if (!pg)
> + ptdesc = pagetable_alloc(GFP_KERNEL_ACCOUNT, 0);
> + if (!ptdesc)
> return NULL;
>
> - if (!pgtable_pmd_page_ctor(pg)) {
> - __free_page(pg);
> + if (!pagetable_pmd_ctor(ptdesc)) {
> + pagetable_free(ptdesc);
> return NULL;
> }
>
> - pmd = (pmd_t *)page_address(pg);
> + pmd = ptdesc_address(ptdesc);
> pmd_init(pmd);
> return pmd;
> }
> @@ -80,10 +80,13 @@ static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
> static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
> {
> pud_t *pud;
> + struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL, 0);
>
> - pud = (pud_t *) __get_free_page(GFP_KERNEL);
> - if (pud)
> - pud_init(pud);
> + if (!ptdesc)
> + return NULL;
> + pud = ptdesc_address(ptdesc);
> +
> + pud_init(pud);
> return pud;
> }
>
> diff --git a/arch/loongarch/mm/pgtable.c b/arch/loongarch/mm/pgtable.c
> index 36a6dc0148ae..cdba10ffc0df 100644
> --- a/arch/loongarch/mm/pgtable.c
> +++ b/arch/loongarch/mm/pgtable.c
> @@ -11,10 +11,11 @@
>
> pgd_t *pgd_alloc(struct mm_struct *mm)
> {
> - pgd_t *ret, *init;
> + pgd_t *init, *ret = NULL;
> + struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL, 0);
>
> - ret = (pgd_t *) __get_free_page(GFP_KERNEL);
> - if (ret) {
> + if (ptdesc) {
> + ret = (pgd_t *)ptdesc_address(ptdesc);
> init = pgd_offset(&init_mm, 0UL);
> pgd_init(ret);
> memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
> --
> 2.40.1
>
>
--
Sincerely yours,
Mike.
