diff options
Diffstat (limited to 'arch/cris')
| -rw-r--r-- | arch/cris/arch-v32/mm/tlb.c | 56 |
1 files changed, 28 insertions, 28 deletions
diff --git a/arch/cris/arch-v32/mm/tlb.c b/arch/cris/arch-v32/mm/tlb.c index a076ef6e938..eda5ebcaea5 100644 --- a/arch/cris/arch-v32/mm/tlb.c +++ b/arch/cris/arch-v32/mm/tlb.c @@ -13,8 +13,8 @@ #include <asm/arch/hwregs/supp_reg.h> #define UPDATE_TLB_SEL_IDX(val) \ -do { \ - unsigned long tlb_sel; \ +do { \ + unsigned long tlb_sel; \ \ tlb_sel = REG_FIELD(mmu, rw_mm_tlb_sel, idx, val); \ SUPP_REG_WR(RW_MM_TLB_SEL, tlb_sel); \ @@ -30,8 +30,8 @@ do { \ * The TLB can host up to 256 different mm contexts at the same time. The running * context is found in the PID register. Each TLB entry contains a page_id that * has to match the PID register to give a hit. page_id_map keeps track of which - * mm is assigned to which page_id, making sure it's known when to invalidate TLB - * entries. + * mm's is assigned to which page_id's, making sure it's known when to + * invalidate TLB entries. * * The last page_id is never running, it is used as an invalid page_id so that * it's possible to make TLB entries that will nerver match. @@ -179,29 +179,29 @@ void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk) { - int cpu = smp_processor_id(); - - /* Make sure there is a MMU context. */ - spin_lock(&mmu_context_lock); - get_mmu_context(next); - cpu_set(cpu, next->cpu_vm_mask); - spin_unlock(&mmu_context_lock); - - /* - * Remember the pgd for the fault handlers. Keep a separate copy of it - * because current and active_mm might be invalid at points where - * there's still a need to derefer the pgd. - */ - per_cpu(current_pgd, cpu) = next->pgd; - - /* Switch context in the MMU. */ - if (tsk && task_thread_info(tsk)) - { - SPEC_REG_WR(SPEC_REG_PID, next->context.page_id | task_thread_info(tsk)->tls); - } - else - { - SPEC_REG_WR(SPEC_REG_PID, next->context.page_id); - } + if (prev != next) { + int cpu = smp_processor_id(); + + /* Make sure there is a MMU context. */ + spin_lock(&mmu_context_lock); + get_mmu_context(next); + cpu_set(cpu, next->cpu_vm_mask); + spin_unlock(&mmu_context_lock); + + /* + * Remember the pgd for the fault handlers. Keep a seperate + * copy of it because current and active_mm might be invalid + * at points where * there's still a need to derefer the pgd. + */ + per_cpu(current_pgd, cpu) = next->pgd; + + /* Switch context in the MMU. */ + if (tsk && task_thread_info(tsk)) { + SPEC_REG_WR(SPEC_REG_PID, next->context.page_id | + task_thread_info(tsk)->tls); + } else { + SPEC_REG_WR(SPEC_REG_PID, next->context.page_id); + } + } } |