1 #ifndef _ASM_POWERPC_PTE_WALK_H
2 #define _ASM_POWERPC_PTE_WALK_H
3
4 #include <linux/sched.h>
5
6 /* Don't use this directly */
7 extern pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea,
8 bool *is_thp, unsigned *hshift);
9
find_linux_pte(pgd_t * pgdir,unsigned long ea,bool * is_thp,unsigned * hshift)10 static inline pte_t *find_linux_pte(pgd_t *pgdir, unsigned long ea,
11 bool *is_thp, unsigned *hshift)
12 {
13 pte_t *pte;
14
15 VM_WARN(!arch_irqs_disabled(), "%s called with irq enabled\n", __func__);
16 pte = __find_linux_pte(pgdir, ea, is_thp, hshift);
17
18 #if defined(CONFIG_DEBUG_VM) && \
19 !(defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE))
20 /*
21 * We should not find huge page if these configs are not enabled.
22 */
23 if (hshift)
24 WARN_ON(*hshift);
25 #endif
26 return pte;
27 }
28
find_init_mm_pte(unsigned long ea,unsigned * hshift)29 static inline pte_t *find_init_mm_pte(unsigned long ea, unsigned *hshift)
30 {
31 pgd_t *pgdir = init_mm.pgd;
32 return __find_linux_pte(pgdir, ea, NULL, hshift);
33 }
34 /*
35 * This is what we should always use. Any other lockless page table lookup needs
36 * careful audit against THP split.
37 */
find_current_mm_pte(pgd_t * pgdir,unsigned long ea,bool * is_thp,unsigned * hshift)38 static inline pte_t *find_current_mm_pte(pgd_t *pgdir, unsigned long ea,
39 bool *is_thp, unsigned *hshift)
40 {
41 pte_t *pte;
42
43 VM_WARN(!arch_irqs_disabled(), "%s called with irq enabled\n", __func__);
44 VM_WARN(pgdir != current->mm->pgd,
45 "%s lock less page table lookup called on wrong mm\n", __func__);
46 pte = __find_linux_pte(pgdir, ea, is_thp, hshift);
47
48 #if defined(CONFIG_DEBUG_VM) && \
49 !(defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE))
50 /*
51 * We should not find huge page if these configs are not enabled.
52 */
53 if (hshift)
54 WARN_ON(*hshift);
55 #endif
56 return pte;
57 }
58
59 #endif /* _ASM_POWERPC_PTE_WALK_H */
60