108 lines
2.8 KiB
C
108 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_GENERIC_PGALLOC_H
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#define __ASM_GENERIC_PGALLOC_H
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#ifdef CONFIG_MMU
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#define GFP_PGTABLE_KERNEL (GFP_KERNEL | __GFP_ZERO)
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#define GFP_PGTABLE_USER (GFP_PGTABLE_KERNEL | __GFP_ACCOUNT)
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/**
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* __pte_alloc_one_kernel - allocate a page for PTE-level kernel page table
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* @mm: the mm_struct of the current context
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*
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* This function is intended for architectures that need
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* anything beyond simple page allocation.
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*
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* Return: pointer to the allocated memory or %NULL on error
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*/
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static inline pte_t *__pte_alloc_one_kernel(struct mm_struct *mm)
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{
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return (pte_t *)__get_free_page(GFP_PGTABLE_KERNEL);
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}
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#ifndef __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
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/**
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* pte_alloc_one_kernel - allocate a page for PTE-level kernel page table
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* @mm: the mm_struct of the current context
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*
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* Return: pointer to the allocated memory or %NULL on error
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*/
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static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
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{
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return __pte_alloc_one_kernel(mm);
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}
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#endif
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/**
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* pte_free_kernel - free PTE-level kernel page table page
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* @mm: the mm_struct of the current context
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* @pte: pointer to the memory containing the page table
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*/
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static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
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{
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free_page((unsigned long)pte);
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}
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/**
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* __pte_alloc_one - allocate a page for PTE-level user page table
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* @mm: the mm_struct of the current context
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* @gfp: GFP flags to use for the allocation
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*
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* Allocates a page and runs the pgtable_pte_page_ctor().
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*
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* This function is intended for architectures that need
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* anything beyond simple page allocation or must have custom GFP flags.
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*
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* Return: `struct page` initialized as page table or %NULL on error
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*/
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static inline pgtable_t __pte_alloc_one(struct mm_struct *mm, gfp_t gfp)
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{
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struct page *pte;
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pte = alloc_page(gfp);
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if (!pte)
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return NULL;
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if (!pgtable_pte_page_ctor(pte)) {
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__free_page(pte);
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return NULL;
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}
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return pte;
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}
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#ifndef __HAVE_ARCH_PTE_ALLOC_ONE
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/**
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* pte_alloc_one - allocate a page for PTE-level user page table
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* @mm: the mm_struct of the current context
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*
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* Allocates a page and runs the pgtable_pte_page_ctor().
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*
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* Return: `struct page` initialized as page table or %NULL on error
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*/
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static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
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{
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return __pte_alloc_one(mm, GFP_PGTABLE_USER);
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}
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#endif
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/*
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* Should really implement gc for free page table pages. This could be
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* done with a reference count in struct page.
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*/
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/**
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* pte_free - free PTE-level user page table page
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* @mm: the mm_struct of the current context
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* @pte_page: the `struct page` representing the page table
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*/
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static inline void pte_free(struct mm_struct *mm, struct page *pte_page)
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{
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pgtable_pte_page_dtor(pte_page);
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__free_page(pte_page);
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}
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#endif /* CONFIG_MMU */
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#endif /* __ASM_GENERIC_PGALLOC_H */
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