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| author |   Ram Pai <linuxram@us.ibm.com> | 2018-01-18 17:50:41 -0800 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2018-01-20 22:59:05 +1100 |
| commit | 087003e9ef7c1c5bec932387e47511429eff2a54 (patch) | |
| tree | fcd8cdc6a20be99816dcf9741b26215c1a69f27d /arch/powerpc/mm/hash_utils_64.c | |
| parent | powerpc: Handle exceptions caused by pkey violation (diff) | |
| download | linux-dev-087003e9ef7c1c5bec932387e47511429eff2a54.tar.xz linux-dev-087003e9ef7c1c5bec932387e47511429eff2a54.zip | |
powerpc: introduce get_mm_addr_key() helper
get_mm_addr_key() helper returns the pkey associated with
an address corresponding to a given mm_struct.
Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/mm/hash_utils_64.c')
| -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) { |