Linux kernel mirror (for testing)
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __ASM_SH_PGALLOC_H
3#define __ASM_SH_PGALLOC_H
4
5#include <linux/quicklist.h>
6#include <asm/page.h>
7
8#define QUICK_PT 0 /* Other page table pages that are zero on free */
9
10extern pgd_t *pgd_alloc(struct mm_struct *);
11extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
12
13#if PAGETABLE_LEVELS > 2
14extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd);
15extern pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address);
16extern void pmd_free(struct mm_struct *mm, pmd_t *pmd);
17#endif
18
19static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
20 pte_t *pte)
21{
22 set_pmd(pmd, __pmd((unsigned long)pte));
23}
24
25static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
26 pgtable_t pte)
27{
28 set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
29}
30#define pmd_pgtable(pmd) pmd_page(pmd)
31
32/*
33 * Allocate and free page tables.
34 */
35static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
36 unsigned long address)
37{
38 return quicklist_alloc(QUICK_PT, GFP_KERNEL, NULL);
39}
40
41static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
42 unsigned long address)
43{
44 struct page *page;
45 void *pg;
46
47 pg = quicklist_alloc(QUICK_PT, GFP_KERNEL, NULL);
48 if (!pg)
49 return NULL;
50 page = virt_to_page(pg);
51 if (!pgtable_page_ctor(page)) {
52 quicklist_free(QUICK_PT, NULL, pg);
53 return NULL;
54 }
55 return page;
56}
57
58static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
59{
60 quicklist_free(QUICK_PT, NULL, pte);
61}
62
63static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
64{
65 pgtable_page_dtor(pte);
66 quicklist_free_page(QUICK_PT, NULL, pte);
67}
68
69#define __pte_free_tlb(tlb,pte,addr) \
70do { \
71 pgtable_page_dtor(pte); \
72 tlb_remove_page((tlb), (pte)); \
73} while (0)
74
75static inline void check_pgt_cache(void)
76{
77 quicklist_trim(QUICK_PT, NULL, 25, 16);
78}
79
80#endif /* __ASM_SH_PGALLOC_H */