MIPS: Move idle task creation to work queue

To avoid forking usermode thread when creating an idle task, move fork_idle
to a work queue.

If kernel starts with maxcpus= option which does not bring all available
cpus online at boot time, idle tasks for offline cpus are not created. If
later offline cpus are hotplugged through sysfs, __cpu_up is called in
the context of the user task, and fork_idle copies its non-zero mm
pointer.  This causes BUG() in per_cpu_trap_init.

This also avoids issues with resource limits of the CPU writing to sysfs,
containers, maybe others.

Signed-off-by: Maksim Rayskiy <mrayskiy@broadcom.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2070/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c
index 383aeb95cb49ee2a8e27f489826c66b6d0f6663f..32a2561010823253c24b9d9cffdc1801d380f9a9 100644 (file)
--- a/arch/mips/kernel/smp.c
+++ b/arch/mips/kernel/smp.c
@@ -193,6 +193,22 @@ void __devinit smp_prepare_boot_cpu(void)
  */
 static struct task_struct *cpu_idle_thread[NR_CPUS];
 
+struct create_idle {
+       struct work_struct work;
+       struct task_struct *idle;
+       struct completion done;
+       int cpu;
+};
+
+static void __cpuinit do_fork_idle(struct work_struct *work)
+{
+       struct create_idle *c_idle =
+               container_of(work, struct create_idle, work);
+
+       c_idle->idle = fork_idle(c_idle->cpu);
+       complete(&c_idle->done);
+}
+
 int __cpuinit __cpu_up(unsigned int cpu)
 {
        struct task_struct *idle;
@@ -203,8 +219,19 @@ int __cpuinit __cpu_up(unsigned int cpu)
         * Linux can schedule processes on this slave.
         */
        if (!cpu_idle_thread[cpu]) {
-               idle = fork_idle(cpu);
-               cpu_idle_thread[cpu] = idle;
+               /*
+                * Schedule work item to avoid forking user task
+                * Ported from arch/x86/kernel/smpboot.c
+                */
+               struct create_idle c_idle = {
+                       .cpu    = cpu,
+                       .done   = COMPLETION_INITIALIZER_ONSTACK(c_idle.done),
+               };
+
+               INIT_WORK_ONSTACK(&c_idle.work, do_fork_idle);
+               schedule_work(&c_idle.work);
+               wait_for_completion(&c_idle.done);
+               idle = cpu_idle_thread[cpu] = c_idle.idle;
 
                if (IS_ERR(idle))
                        panic(KERN_ERR "Fork failed for CPU %d", cpu);