Merge tag 's390-6.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

[linux-block.git] / arch / s390 / kernel / smp.c

diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index d4888453bbf8b180714e24ad9c685f26db3f3636..726de4f4df0189240bea16888daeb65744f35bed 100644 (file)
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -280,9 +280,8 @@ static void pcpu_attach_task(struct pcpu *pcpu, struct task_struct *tsk)
 
        cpu = pcpu - pcpu_devices;
        lc = lowcore_ptr[cpu];
-       lc->kernel_stack = (unsigned long) task_stack_page(tsk)
-               + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
-       lc->current_task = (unsigned long) tsk;
+       lc->kernel_stack = (unsigned long)task_stack_page(tsk) + STACK_INIT_OFFSET;
+       lc->current_task = (unsigned long)tsk;
        lc->lpp = LPP_MAGIC;
        lc->current_pid = tsk->pid;
        lc->user_timer = tsk->thread.user_timer;
@@ -348,7 +347,6 @@ static void pcpu_delegate(struct pcpu *pcpu,
                abs_lc->restart_source = source_cpu;
                put_abs_lowcore(abs_lc);
        }
-       __bpon();
        asm volatile(
                "0:     sigp    0,%0,%2 # sigp restart to target cpu\n"
                "       brc     2,0b    # busy, try again\n"
@@ -553,7 +551,7 @@ void arch_send_call_function_single_ipi(int cpu)
  * it goes straight through and wastes no time serializing
  * anything. Worst case is that we lose a reschedule ...
  */
-void smp_send_reschedule(int cpu)
+void arch_smp_send_reschedule(int cpu)
 {
        pcpu_ec_call(pcpu_devices + cpu, ec_schedule);
 }
@@ -986,7 +984,6 @@ void __cpu_die(unsigned int cpu)
 void __noreturn cpu_die(void)
 {
        idle_task_exit();
-       __bpon();
        pcpu_sigp_retry(pcpu_devices + smp_processor_id(), SIGP_STOP, 0);
        for (;;) ;
 }
@@ -1227,11 +1224,17 @@ static DEVICE_ATTR_WO(rescan);
 
 static int __init s390_smp_init(void)
 {
+       struct device *dev_root;
        int cpu, rc = 0;
 
-       rc = device_create_file(cpu_subsys.dev_root, &dev_attr_rescan);
-       if (rc)
-               return rc;
+       dev_root = bus_get_dev_root(&cpu_subsys);
+       if (dev_root) {
+               rc = device_create_file(dev_root, &dev_attr_rescan);
+               put_device(dev_root);
+               if (rc)
+                       return rc;
+       }
+
        for_each_present_cpu(cpu) {
                rc = smp_add_present_cpu(cpu);
                if (rc)
@@ -1296,9 +1299,9 @@ int __init smp_reinit_ipl_cpu(void)
        local_mcck_enable();
        local_irq_restore(flags);
 
-       free_pages(lc_ipl->async_stack - STACK_INIT_OFFSET, THREAD_SIZE_ORDER);
        memblock_free_late(__pa(lc_ipl->mcck_stack - STACK_INIT_OFFSET), THREAD_SIZE);
+       memblock_free_late(__pa(lc_ipl->async_stack - STACK_INIT_OFFSET), THREAD_SIZE);
+       memblock_free_late(__pa(lc_ipl->nodat_stack - STACK_INIT_OFFSET), THREAD_SIZE);
        memblock_free_late(__pa(lc_ipl), sizeof(*lc_ipl));
-
        return 0;
 }