1 files changed, 11 insertions, 150 deletions

diff --git a/kernel/timer.c b/kernel/timer.c
index dbf7a78a1ef1..15ffdb3f1948 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -1,7 +1,7 @@
 /*
  *  linux/kernel/timer.c
  *
- *  Kernel internal timers, basic process system calls
+ *  Kernel internal timers
  *
  *  Copyright (C) 1991, 1992  Linus Torvalds
  *
@@ -41,6 +41,7 @@
 #include <linux/sched.h>
 #include <linux/sched/sysctl.h>
 #include <linux/slab.h>
+#include <linux/compat.h>
 
 #include <asm/uaccess.h>
 #include <asm/unistd.h>
@@ -738,7 +739,7 @@ __mod_timer(struct timer_list *timer, unsigned long expires,
 
         cpu = smp_processor_id();
 
-#if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
+#if defined(CONFIG_NO_HZ_COMMON) && defined(CONFIG_SMP)
         if (!pinned && get_sysctl_timer_migration() && idle_cpu(cpu))
                 cpu = get_nohz_timer_target();
 #endif
@@ -930,14 +931,14 @@ void add_timer_on(struct timer_list *timer, int cpu)
         debug_activate(timer, timer->expires);
         internal_add_timer(base, timer);
         /*
-         * Check whether the other CPU is idle and needs to be
-         * triggered to reevaluate the timer wheel when nohz is
-         * active. We are protected against the other CPU fiddling
+         * Check whether the other CPU is in dynticks mode and needs
+         * to be triggered to reevaluate the timer wheel.
+         * We are protected against the other CPU fiddling
          * with the timer by holding the timer base lock. This also
-         * makes sure that a CPU on the way to idle can not evaluate
-         * the timer wheel.
+         * makes sure that a CPU on the way to stop its tick can not
+         * evaluate the timer wheel.
          */
-        wake_up_idle_cpu(cpu);
+        wake_up_nohz_cpu(cpu);
         spin_unlock_irqrestore(&base->lock, flags);
 }
 EXPORT_SYMBOL_GPL(add_timer_on);
@@ -1188,7 +1189,7 @@ static inline void __run_timers(struct tvec_base *base)
         spin_unlock_irq(&base->lock);
 }
 
-#ifdef CONFIG_NO_HZ
+#ifdef CONFIG_NO_HZ_COMMON
 /*
  * Find out when the next timer event is due to happen. This
  * is used on S/390 to stop all activity when a CPU is idle.
@@ -1395,61 +1396,6 @@ SYSCALL_DEFINE1(alarm, unsigned int, seconds)
 
 #endif
 
-/**
- * sys_getpid - return the thread group id of the current process
- *
- * Note, despite the name, this returns the tgid not the pid.  The tgid and
- * the pid are identical unless CLONE_THREAD was specified on clone() in
- * which case the tgid is the same in all threads of the same group.
- *
- * This is SMP safe as current->tgid does not change.
- */
-SYSCALL_DEFINE0(getpid)
-{
-        return task_tgid_vnr(current);
-}
-
-/*
- * Accessing ->real_parent is not SMP-safe, it could
- * change from under us. However, we can use a stale
- * value of ->real_parent under rcu_read_lock(), see
- * release_task()->call_rcu(delayed_put_task_struct).
- */
-SYSCALL_DEFINE0(getppid)
-{
-        int pid;
-
-        rcu_read_lock();
-        pid = task_tgid_vnr(rcu_dereference(current->real_parent));
-        rcu_read_unlock();
-
-        return pid;
-}
-
-SYSCALL_DEFINE0(getuid)
-{
-        /* Only we change this so SMP safe */
-        return from_kuid_munged(current_user_ns(), current_uid());
-}
-
-SYSCALL_DEFINE0(geteuid)
-{
-        /* Only we change this so SMP safe */
-        return from_kuid_munged(current_user_ns(), current_euid());
-}
-
-SYSCALL_DEFINE0(getgid)
-{
-        /* Only we change this so SMP safe */
-        return from_kgid_munged(current_user_ns(), current_gid());
-}
-
-SYSCALL_DEFINE0(getegid)
-{
-        /* Only we change this so SMP safe */
-        return from_kgid_munged(current_user_ns(), current_egid());
-}
-
 static void process_timeout(unsigned long __data)
 {
         wake_up_process((struct task_struct *)__data);
@@ -1557,91 +1503,6 @@ signed long __sched schedule_timeout_uninterruptible(signed long timeout)
 }
 EXPORT_SYMBOL(schedule_timeout_uninterruptible);
 
-/* Thread ID - the internal kernel "pid" */
-SYSCALL_DEFINE0(gettid)
-{
-        return task_pid_vnr(current);
-}
-
-/**
- * do_sysinfo - fill in sysinfo struct
- * @info: pointer to buffer to fill
- */
-int do_sysinfo(struct sysinfo *info)
-{
-        unsigned long mem_total, sav_total;
-        unsigned int mem_unit, bitcount;
-        struct timespec tp;
-
-        memset(info, 0, sizeof(struct sysinfo));
-
-        ktime_get_ts(&tp);
-        monotonic_to_bootbased(&tp);
-        info->uptime = tp.tv_sec + (tp.tv_nsec ? 1 : 0);
-
-        get_avenrun(info->loads, 0, SI_LOAD_SHIFT - FSHIFT);
-
-        info->procs = nr_threads;
-
-        si_meminfo(info);
-        si_swapinfo(info);
-
-        /*
-         * If the sum of all the available memory (i.e. ram + swap)
-         * is less than can be stored in a 32 bit unsigned long then
-         * we can be binary compatible with 2.2.x kernels.  If not,
-         * well, in that case 2.2.x was broken anyways...
-         *
-         *  -Erik Andersen <andersee@debian.org>
-         */
-
-        mem_total = info->totalram + info->totalswap;
-        if (mem_total < info->totalram || mem_total < info->totalswap)
-                goto out;
-        bitcount = 0;
-        mem_unit = info->mem_unit;
-        while (mem_unit > 1) {
-                bitcount++;
-                mem_unit >>= 1;
-                sav_total = mem_total;
-                mem_total <<= 1;
-                if (mem_total < sav_total)
-                        goto out;
-        }
-
-        /*
-         * If mem_total did not overflow, multiply all memory values by
-         * info->mem_unit and set it to 1.  This leaves things compatible
-         * with 2.2.x, and also retains compatibility with earlier 2.4.x
-         * kernels...
-         */
-
-        info->mem_unit = 1;
-        info->totalram <<= bitcount;
-        info->freeram <<= bitcount;
-        info->sharedram <<= bitcount;
-        info->bufferram <<= bitcount;
-        info->totalswap <<= bitcount;
-        info->freeswap <<= bitcount;
-        info->totalhigh <<= bitcount;
-        info->freehigh <<= bitcount;
-
-out:
-        return 0;
-}
-
-SYSCALL_DEFINE1(sysinfo, struct sysinfo __user *, info)
-{
-        struct sysinfo val;
-
-        do_sysinfo(&val);
-
-        if (copy_to_user(info, &val, sizeof(struct sysinfo)))
-                return -EFAULT;
-
-        return 0;
-}
-
 static int __cpuinit init_timers_cpu(int cpu)
 {
         int j;
@@ -1678,12 +1539,12 @@ static int __cpuinit init_timers_cpu(int cpu)
                         boot_done = 1;
                         base = &boot_tvec_bases;
                 }
+                spin_lock_init(&base->lock);
                 tvec_base_done[cpu] = 1;
         } else {
                 base = per_cpu(tvec_bases, cpu);
         }
 
-        spin_lock_init(&base->lock);
 
         for (j = 0; j < TVN_SIZE; j++) {
                 INIT_LIST_HEAD(base->tv5.vec + j);