diff options
Diffstat (limited to 'arch/s390/mm/pgtable.c')
| -rw-r--r-- | arch/s390/mm/pgtable.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c index 74f8f2a8a4e8..b98d1a152d46 100644 --- a/arch/s390/mm/pgtable.c +++ b/arch/s390/mm/pgtable.c @@ -352,6 +352,45 @@ pmd_t pmdp_xchg_lazy(struct mm_struct *mm, unsigned long addr, } EXPORT_SYMBOL(pmdp_xchg_lazy); +static inline pud_t pudp_flush_direct(struct mm_struct *mm, + unsigned long addr, pud_t *pudp) +{ + pud_t old; + + old = *pudp; + if (pud_val(old) & _REGION_ENTRY_INVALID) + return old; + if (!MACHINE_HAS_IDTE) { + /* + * Invalid bit position is the same for pmd and pud, so we can + * re-use _pmd_csp() here + */ + __pmdp_csp((pmd_t *) pudp); + return old; + } + atomic_inc(&mm->context.flush_count); + if (MACHINE_HAS_TLB_LC && + cpumask_equal(mm_cpumask(mm), cpumask_of(smp_processor_id()))) + __pudp_idte_local(addr, pudp); + else + __pudp_idte(addr, pudp); + atomic_dec(&mm->context.flush_count); + return old; +} + +pud_t pudp_xchg_direct(struct mm_struct *mm, unsigned long addr, + pud_t *pudp, pud_t new) +{ + pud_t old; + + preempt_disable(); + old = pudp_flush_direct(mm, addr, pudp); + *pudp = new; + preempt_enable(); + return old; +} +EXPORT_SYMBOL(pudp_xchg_direct); + #ifdef CONFIG_TRANSPARENT_HUGEPAGE void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp, pgtable_t pgtable) |