void switch_mm()

in mm/tlb.c [137:162]

• 12 lines of code
• 2 McCabe index (conditional complexity)

void switch_mm(struct mm_struct *prev, struct mm_struct *next,
	       struct task_struct *next_tsk)
{
	unsigned int cpu;

	if (unlikely(prev == next))
		return;

	cpu = smp_processor_id();

	cpumask_clear_cpu(cpu, mm_cpumask(prev));
	cpumask_set_cpu(cpu, mm_cpumask(next));

	/* remember the pgd for the fault handlers
	 * this is similar to the pgd register in some other CPU's.
	 * we need our own copy of it because current and active_mm
	 * might be invalid at points where we still need to derefer
	 * the pgd.
	 */
	current_pgd[cpu] = next->pgd;

	/* We don't have context support implemented, so flush all
	 * entries belonging to previous map
	 */
	local_flush_tlb_mm(prev);
}