arm64: mm: kill mm_cpumask usage

mm_cpumask isn't actually used for anything on arm64, so remove all the
code trying to keep it up-to-date.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index fdd4d4d..03b0aa2 100644 (file)
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -142,7 +142,6 @@ asmlinkage void secondary_start_kernel(void)
         */
        atomic_inc(&mm->mm_count);
        current->active_mm = mm;
-       cpumask_set_cpu(cpu, mm_cpumask(mm));
 
        set_my_cpu_offset(per_cpu_offset(smp_processor_id()));
        printk("CPU%u: Booted secondary processor\n", cpu);
@@ -233,12 +232,6 @@ int __cpu_disable(void)
         * OK - migrate IRQs away from this CPU
         */
        migrate_irqs();
-
-       /*
-        * Remove this CPU from the vm mask set of all processes.
-        */
-       clear_tasks_mm_cpumask(cpu);
-
        return 0;
 }
 

diff --git a/arch/arm64/mm/context.c b/arch/arm64/mm/context.c
index 4b9ec44..f636a26 100644 (file)
--- a/arch/arm64/mm/context.c
+++ b/arch/arm64/mm/context.c
@@ -132,7 +132,6 @@ set_asid:
 
 bump_gen:
        asid |= generation;
-       cpumask_clear(mm_cpumask(mm));
        return asid;
 }
 
@@ -169,7 +168,6 @@ void check_and_switch_context(struct mm_struct *mm, unsigned int cpu)
        raw_spin_unlock_irqrestore(&cpu_asid_lock, flags);
 
 switch_mm_fastpath:
-       cpumask_set_cpu(cpu, mm_cpumask(mm));
        cpu_switch_mm(mm->pgd, mm);
 }