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