arch/powerpc/include/asm/pte-walk.h

   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         VM_WARN(!arch_irqs_disabled(), "%s called with irq enabled\n", __func__);
  14         return __find_linux_pte(pgdir, ea, is_thp, hshift);
  15 }
  16
  17 static inline pte_t *find_init_mm_pte(unsigned long ea, unsigned *hshift)
  18 {
  19         pgd_t *pgdir = init_mm.pgd;
  20         return __find_linux_pte(pgdir, ea, NULL, hshift);
  21 }
  22 /*
  23  * This is what we should always use. Any other lockless page table lookup needs
  24  * careful audit against THP split.
  25  */
  26 static inline pte_t *find_current_mm_pte(pgd_t *pgdir, unsigned long ea,
  27                                          bool *is_thp, unsigned *hshift)
  28 {
  29         VM_WARN(!arch_irqs_disabled(), "%s called with irq enabled\n", __func__);
  30         VM_WARN(pgdir != current->mm->pgd,
  31                 "%s lock less page table lookup called on wrong mm\n", __func__);
  32         return __find_linux_pte(pgdir, ea, is_thp, hshift);
  33 }
  34
  35 #endif /* _ASM_POWERPC_PTE_WALK_H */