diff options
Diffstat (limited to 'arch/s390/mm/pgtable.c')
| -rw-r--r-- | arch/s390/mm/pgtable.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c index 0d25f743b270..18205f851c24 100644 --- a/arch/s390/mm/pgtable.c +++ b/arch/s390/mm/pgtable.c @@ -24,6 +24,26 @@ #include <asm/mmu_context.h> #include <asm/page-states.h> +pgprot_t pgprot_writecombine(pgprot_t prot) +{ + /* + * mio_wb_bit_mask may be set on a different CPU, but it is only set + * once at init and only read afterwards. + */ + return __pgprot(pgprot_val(prot) | mio_wb_bit_mask); +} +EXPORT_SYMBOL_GPL(pgprot_writecombine); + +pgprot_t pgprot_writethrough(pgprot_t prot) +{ + /* + * mio_wb_bit_mask may be set on a different CPU, but it is only set + * once at init and only read afterwards. + */ + return __pgprot(pgprot_val(prot) & ~mio_wb_bit_mask); +} +EXPORT_SYMBOL_GPL(pgprot_writethrough); + static inline void ptep_ipte_local(struct mm_struct *mm, unsigned long addr, pte_t *ptep, int nodat) { |