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 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 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 */ 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