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m68k: mm: Convert get_pointer_table() to use ptdescs

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Motorola uses get_pointer_table() for page tables, so it should be using
struct ptdesc, not struct page.

This helps us prepare to allocate ptdescs as their own memory
descriptor, and prepares to remove a user of page->lru.

Signed-off-by: "Vishal Moola (Oracle)" <vishal.moola@gmail.com>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://lore.kernel.org/20250611001255.527952-2-vishal.moola@gmail.com
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
This commit is contained in:
Vishal Moola (Oracle) 2025-06-10 17:12:52 -07:00 committed by Geert Uytterhoeven
parent e04c78d86a
commit 72fe6dafaa
1 changed files with 15 additions and 11 deletions
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26
arch/m68k/mm/motorola.c
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@ -148,40 +148,44 @@ void *get_pointer_table(struct mm_struct *mm, int type)
/*
* For a pointer table for a user process address space, a
* table is taken from a page allocated for the purpose. Each
* page can hold 8 pointer tables. The page is remapped in
* table is taken from a ptdesc allocated for the purpose. Each
* ptdesc can hold 8 pointer tables. The ptdesc is remapped in
* virtual address space to be noncacheable.
*/
if (mask == 0) {
void *page;
struct ptdesc *ptdesc;
ptable_desc *new;
void *pt_addr;
if (!(page = (void *)get_zeroed_page(GFP_KERNEL)))
ptdesc = pagetable_alloc(GFP_KERNEL | __GFP_ZERO, 0);
if (!ptdesc)
return NULL;
pt_addr = ptdesc_address(ptdesc);
switch (type) {
case TABLE_PTE:
/*
* m68k doesn't have SPLIT_PTE_PTLOCKS for not having
* SMP.
*/
pagetable_pte_ctor(mm, virt_to_ptdesc(page));
pagetable_pte_ctor(mm, ptdesc);
break;
case TABLE_PMD:
pagetable_pmd_ctor(mm, virt_to_ptdesc(page));
pagetable_pmd_ctor(mm, ptdesc);
break;
case TABLE_PGD:
pagetable_pgd_ctor(virt_to_ptdesc(page));
pagetable_pgd_ctor(ptdesc);
break;
}
mmu_page_ctor(page);
mmu_page_ctor(pt_addr);
new = PD_PTABLE(page);
new = PD_PTABLE(pt_addr);
PD_MARKBITS(new) = ptable_mask(type) - 1;
list_add_tail(new, dp);
return (pmd_t *)page;
return (pmd_t *)pt_addr;
}
for (tmp = 1, off = 0; (mask & tmp) == 0; tmp <<= 1, off += ptable_size(type))
@ -191,7 +195,7 @@ void *get_pointer_table(struct mm_struct *mm, int type)
/* move to end of list */
list_move_tail(dp, &ptable_list[type]);
}
return page_address(PD_PAGE(dp)) + off;
return ptdesc_address(PD_PTDESC(dp)) + off;
}
int free_pointer_table(void *table, int type)