diff options
Diffstat (limited to 'include/asm-ppc64/mmu_context.h')
| -rw-r--r-- | include/asm-ppc64/mmu_context.h | 26 |
1 files changed, 12 insertions, 14 deletions
diff --git a/include/asm-ppc64/mmu_context.h b/include/asm-ppc64/mmu_context.h index 77a743402db..4f512e9fa6b 100644 --- a/include/asm-ppc64/mmu_context.h +++ b/include/asm-ppc64/mmu_context.h @@ -17,22 +17,15 @@ */ /* - * Every architecture must define this function. It's the fastest - * way of searching a 140-bit bitmap where the first 100 bits are - * unlikely to be set. It's guaranteed that at least one of the 140 - * bits is cleared. + * Getting into a kernel thread, there is no valid user segment, mark + * paca->pgdir NULL so that SLB miss on user addresses will fault */ -static inline int sched_find_first_bit(unsigned long *b) -{ - if (unlikely(b[0])) - return __ffs(b[0]); - if (unlikely(b[1])) - return __ffs(b[1]) + 64; - return __ffs(b[2]) + 128; -} - -static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) +static inline void enter_lazy_tlb(struct mm_struct *mm, + struct task_struct *tsk) { +#ifdef CONFIG_PPC_64K_PAGES + get_paca()->pgdir = NULL; +#endif /* CONFIG_PPC_64K_PAGES */ } #define NO_CONTEXT 0 @@ -55,8 +48,13 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, cpu_set(smp_processor_id(), next->cpu_vm_mask); /* No need to flush userspace segments if the mm doesnt change */ +#ifdef CONFIG_PPC_64K_PAGES + if (prev == next && get_paca()->pgdir == next->pgd) + return; +#else if (prev == next) return; +#endif /* CONFIG_PPC_64K_PAGES */ #ifdef CONFIG_ALTIVEC if (cpu_has_feature(CPU_FTR_ALTIVEC)) |