On Mon, Jun 12, 2023 at 02:04:03PM -0700, Vishal Moola (Oracle) wrote:
> In order to split struct ptdesc from struct page, convert various
> functions to use ptdescs.
>
> Signed-off-by: Vishal Moola (Oracle) <vishal.mo...@gmail.com>
Acked-by: Mike Rapoport (IBM) <r...@kernel.org>
> ---
> arch/powerpc/mm/book3s64/mmu_context.c | 10 +++---
> arch/powerpc/mm/book3s64/pgtable.c | 32 +++++++++---------
> arch/powerpc/mm/pgtable-frag.c | 46 +++++++++++++-------------
> 3 files changed, 44 insertions(+), 44 deletions(-)
>
> diff --git a/arch/powerpc/mm/book3s64/mmu_context.c
> b/arch/powerpc/mm/book3s64/mmu_context.c
> index c766e4c26e42..1715b07c630c 100644
> --- a/arch/powerpc/mm/book3s64/mmu_context.c
> +++ b/arch/powerpc/mm/book3s64/mmu_context.c
> @@ -246,15 +246,15 @@ static void destroy_contexts(mm_context_t *ctx)
> static void pmd_frag_destroy(void *pmd_frag)
> {
> int count;
> - struct page *page;
> + struct ptdesc *ptdesc;
>
> - page = virt_to_page(pmd_frag);
> + ptdesc = virt_to_ptdesc(pmd_frag);
> /* drop all the pending references */
> count = ((unsigned long)pmd_frag & ~PAGE_MASK) >> PMD_FRAG_SIZE_SHIFT;
> /* We allow PTE_FRAG_NR fragments from a PTE page */
> - if (atomic_sub_and_test(PMD_FRAG_NR - count, &page->pt_frag_refcount)) {
> - pgtable_pmd_page_dtor(page);
> - __free_page(page);
> + if (atomic_sub_and_test(PMD_FRAG_NR - count,
> &ptdesc->pt_frag_refcount)) {
> + pagetable_pmd_dtor(ptdesc);
> + pagetable_free(ptdesc);
> }
> }
>
> diff --git a/arch/powerpc/mm/book3s64/pgtable.c
> b/arch/powerpc/mm/book3s64/pgtable.c
> index 85c84e89e3ea..1212deeabe15 100644
> --- a/arch/powerpc/mm/book3s64/pgtable.c
> +++ b/arch/powerpc/mm/book3s64/pgtable.c
> @@ -306,22 +306,22 @@ static pmd_t *get_pmd_from_cache(struct mm_struct *mm)
> static pmd_t *__alloc_for_pmdcache(struct mm_struct *mm)
> {
> void *ret = NULL;
> - struct page *page;
> + struct ptdesc *ptdesc;
> gfp_t gfp = GFP_KERNEL_ACCOUNT | __GFP_ZERO;
>
> if (mm == &init_mm)
> gfp &= ~__GFP_ACCOUNT;
> - page = alloc_page(gfp);
> - if (!page)
> + ptdesc = pagetable_alloc(gfp, 0);
> + if (!ptdesc)
> return NULL;
> - if (!pgtable_pmd_page_ctor(page)) {
> - __free_pages(page, 0);
> + if (!pagetable_pmd_ctor(ptdesc)) {
> + pagetable_free(ptdesc);
> return NULL;
> }
>
> - atomic_set(&page->pt_frag_refcount, 1);
> + atomic_set(&ptdesc->pt_frag_refcount, 1);
>
> - ret = page_address(page);
> + ret = ptdesc_address(ptdesc);
> /*
> * if we support only one fragment just return the
> * allocated page.
> @@ -331,12 +331,12 @@ static pmd_t *__alloc_for_pmdcache(struct mm_struct *mm)
>
> spin_lock(&mm->page_table_lock);
> /*
> - * If we find pgtable_page set, we return
> + * If we find ptdesc_page set, we return
> * the allocated page with single fragment
> * count.
> */
> if (likely(!mm->context.pmd_frag)) {
> - atomic_set(&page->pt_frag_refcount, PMD_FRAG_NR);
> + atomic_set(&ptdesc->pt_frag_refcount, PMD_FRAG_NR);
> mm->context.pmd_frag = ret + PMD_FRAG_SIZE;
> }
> spin_unlock(&mm->page_table_lock);
> @@ -357,15 +357,15 @@ pmd_t *pmd_fragment_alloc(struct mm_struct *mm,
> unsigned long vmaddr)
>
> void pmd_fragment_free(unsigned long *pmd)
> {
> - struct page *page = virt_to_page(pmd);
> + struct ptdesc *ptdesc = virt_to_ptdesc(pmd);
>
> - if (PageReserved(page))
> - return free_reserved_page(page);
> + if (pagetable_is_reserved(ptdesc))
> + return free_reserved_ptdesc(ptdesc);
>
> - BUG_ON(atomic_read(&page->pt_frag_refcount) <= 0);
> - if (atomic_dec_and_test(&page->pt_frag_refcount)) {
> - pgtable_pmd_page_dtor(page);
> - __free_page(page);
> + BUG_ON(atomic_read(&ptdesc->pt_frag_refcount) <= 0);
> + if (atomic_dec_and_test(&ptdesc->pt_frag_refcount)) {
> + pagetable_pmd_dtor(ptdesc);
> + pagetable_free(ptdesc);
> }
> }
>
> diff --git a/arch/powerpc/mm/pgtable-frag.c b/arch/powerpc/mm/pgtable-frag.c
> index 20652daa1d7e..8961f1540209 100644
> --- a/arch/powerpc/mm/pgtable-frag.c
> +++ b/arch/powerpc/mm/pgtable-frag.c
> @@ -18,15 +18,15 @@
> void pte_frag_destroy(void *pte_frag)
> {
> int count;
> - struct page *page;
> + struct ptdesc *ptdesc;
>
> - page = virt_to_page(pte_frag);
> + ptdesc = virt_to_ptdesc(pte_frag);
> /* drop all the pending references */
> count = ((unsigned long)pte_frag & ~PAGE_MASK) >> PTE_FRAG_SIZE_SHIFT;
> /* We allow PTE_FRAG_NR fragments from a PTE page */
> - if (atomic_sub_and_test(PTE_FRAG_NR - count, &page->pt_frag_refcount)) {
> - pgtable_pte_page_dtor(page);
> - __free_page(page);
> + if (atomic_sub_and_test(PTE_FRAG_NR - count,
> &ptdesc->pt_frag_refcount)) {
> + pagetable_pte_dtor(ptdesc);
> + pagetable_free(ptdesc);
> }
> }
>
> @@ -55,25 +55,25 @@ static pte_t *get_pte_from_cache(struct mm_struct *mm)
> static pte_t *__alloc_for_ptecache(struct mm_struct *mm, int kernel)
> {
> void *ret = NULL;
> - struct page *page;
> + struct ptdesc *ptdesc;
>
> if (!kernel) {
> - page = alloc_page(PGALLOC_GFP | __GFP_ACCOUNT);
> - if (!page)
> + ptdesc = pagetable_alloc(PGALLOC_GFP | __GFP_ACCOUNT, 0);
> + if (!ptdesc)
> return NULL;
> - if (!pgtable_pte_page_ctor(page)) {
> - __free_page(page);
> + if (!pagetable_pte_ctor(ptdesc)) {
> + pagetable_free(ptdesc);
> return NULL;
> }
> } else {
> - page = alloc_page(PGALLOC_GFP);
> - if (!page)
> + ptdesc = pagetable_alloc(PGALLOC_GFP, 0);
> + if (!ptdesc)
> return NULL;
> }
>
> - atomic_set(&page->pt_frag_refcount, 1);
> + atomic_set(&ptdesc->pt_frag_refcount, 1);
>
> - ret = page_address(page);
> + ret = ptdesc_address(ptdesc);
> /*
> * if we support only one fragment just return the
> * allocated page.
> @@ -82,12 +82,12 @@ static pte_t *__alloc_for_ptecache(struct mm_struct *mm,
> int kernel)
> return ret;
> spin_lock(&mm->page_table_lock);
> /*
> - * If we find pgtable_page set, we return
> + * If we find ptdesc_page set, we return
> * the allocated page with single fragment
> * count.
> */
> if (likely(!pte_frag_get(&mm->context))) {
> - atomic_set(&page->pt_frag_refcount, PTE_FRAG_NR);
> + atomic_set(&ptdesc->pt_frag_refcount, PTE_FRAG_NR);
> pte_frag_set(&mm->context, ret + PTE_FRAG_SIZE);
> }
> spin_unlock(&mm->page_table_lock);
> @@ -108,15 +108,15 @@ pte_t *pte_fragment_alloc(struct mm_struct *mm, int
> kernel)
>
> void pte_fragment_free(unsigned long *table, int kernel)
> {
> - struct page *page = virt_to_page(table);
> + struct ptdesc *ptdesc = virt_to_ptdesc(table);
>
> - if (PageReserved(page))
> - return free_reserved_page(page);
> + if (pagetable_is_reserved(ptdesc))
> + return free_reserved_ptdesc(ptdesc);
>
> - BUG_ON(atomic_read(&page->pt_frag_refcount) <= 0);
> - if (atomic_dec_and_test(&page->pt_frag_refcount)) {
> + BUG_ON(atomic_read(&ptdesc->pt_frag_refcount) <= 0);
> + if (atomic_dec_and_test(&ptdesc->pt_frag_refcount)) {
> if (!kernel)
> - pgtable_pte_page_dtor(page);
> - __free_page(page);
> + pagetable_pte_dtor(ptdesc);
> + pagetable_free(ptdesc);
> }
> }
> --
> 2.40.1
>
>
--
Sincerely yours,
Mike.
