diff options
Diffstat (limited to 'arch/powerpc/mm')
| -rw-r--r-- | arch/powerpc/mm/hash_utils_64.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c index a78e24cf93ff..462c34e7b01d 100644 --- a/arch/powerpc/mm/hash_utils_64.c +++ b/arch/powerpc/mm/hash_utils_64.c @@ -1581,6 +1581,30 @@ out_exit: local_irq_restore(flags); } +#ifdef CONFIG_PPC_MEM_KEYS +/* + * Return the protection key associated with the given address and the + * mm_struct. + */ +u16 get_mm_addr_key(struct mm_struct *mm, unsigned long address) +{ + pte_t *ptep; + u16 pkey = 0; + unsigned long flags; + + if (!mm || !mm->pgd) + return 0; + + local_irq_save(flags); + ptep = find_linux_pte(mm->pgd, address, NULL, NULL); + if (ptep) + pkey = pte_to_pkey_bits(pte_val(READ_ONCE(*ptep))); + local_irq_restore(flags); + + return pkey; +} +#endif /* CONFIG_PPC_MEM_KEYS */ + #ifdef CONFIG_PPC_TRANSACTIONAL_MEM static inline void tm_flush_hash_page(int local) { |