4 files changed, 34 insertions, 29 deletions

diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index b9b134b35088..5c69e996bd0f 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -89,7 +89,7 @@ static void hrtimer_get_softirq_time(struct hrtimer_cpu_base *base)
 
         do {
                 seq = read_seqbegin(&xtime_lock);
-                xts = current_kernel_time();
+                xts = __current_kernel_time();
                 tom = wall_to_monotonic;
         } while (read_seqretry(&xtime_lock, seq));
 
diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index e099650cd249..bd7ce8ca5bb9 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -4999,8 +4999,8 @@ SYSCALL_DEFINE5(perf_event_open,
         struct perf_event_context *ctx;
         struct file *event_file = NULL;
         struct file *group_file = NULL;
+        int event_fd;
         int fput_needed = 0;
-        int fput_needed2 = 0;
         int err;
 
         /* for future expandability... */
@@ -5021,12 +5021,18 @@ SYSCALL_DEFINE5(perf_event_open,
                         return -EINVAL;
         }
 
+        event_fd = get_unused_fd_flags(O_RDWR);
+        if (event_fd < 0)
+                return event_fd;
+
         /*
          * Get the target context (task or percpu):
          */
         ctx = find_get_context(pid, cpu);
-        if (IS_ERR(ctx))
-                return PTR_ERR(ctx);
+        if (IS_ERR(ctx)) {
+                err = PTR_ERR(ctx);
+                goto err_fd;
+        }
 
         /*
          * Look up the group leader (we will attach this event to it):
@@ -5066,13 +5072,11 @@ SYSCALL_DEFINE5(perf_event_open,
         if (IS_ERR(event))
                 goto err_put_context;
 
-        err = anon_inode_getfd("[perf_event]", &perf_fops, event, O_RDWR);
-        if (err < 0)
-                goto err_free_put_context;
-
-        event_file = fget_light(err, &fput_needed2);
-        if (!event_file)
+        event_file = anon_inode_getfile("[perf_event]", &perf_fops, event, O_RDWR);
+        if (IS_ERR(event_file)) {
+                err = PTR_ERR(event_file);
                 goto err_free_put_context;
+        }
 
         if (flags & PERF_FLAG_FD_OUTPUT) {
                 err = perf_event_set_output(event, group_fd);
@@ -5093,19 +5097,19 @@ SYSCALL_DEFINE5(perf_event_open,
         list_add_tail(&event->owner_entry, &current->perf_event_list);
         mutex_unlock(&current->perf_event_mutex);
 
-err_fput_free_put_context:
-        fput_light(event_file, fput_needed2);
+        fput_light(group_file, fput_needed);
+        fd_install(event_fd, event_file);
+        return event_fd;
 
+err_fput_free_put_context:
+        fput(event_file);
 err_free_put_context:
-        if (err < 0)
-                free_event(event);
-
+        free_event(event);
 err_put_context:
-        if (err < 0)
-                put_ctx(ctx);
-
         fput_light(group_file, fput_needed);
-
+        put_ctx(ctx);
+err_fd:
+        put_unused_fd(event_fd);
         return err;
 }
 
diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
index 00d1fda58ab6..ad723420acc3 100644
--- a/kernel/posix-timers.c
+++ b/kernel/posix-timers.c
@@ -559,14 +559,7 @@ SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock,
         new_timer->it_id = (timer_t) new_timer_id;
         new_timer->it_clock = which_clock;
         new_timer->it_overrun = -1;
-        error = CLOCK_DISPATCH(which_clock, timer_create, (new_timer));
-        if (error)
-                goto out;
 
-        /*
-         * return the timer_id now.  The next step is hard to
-         * back out if there is an error.
-         */
         if (copy_to_user(created_timer_id,
                          &new_timer_id, sizeof (new_timer_id))) {
                 error = -EFAULT;
@@ -597,6 +590,10 @@ SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock,
         new_timer->sigq->info.si_tid   = new_timer->it_id;
         new_timer->sigq->info.si_code  = SI_TIMER;
 
+        error = CLOCK_DISPATCH(which_clock, timer_create, (new_timer));
+        if (error)
+                goto out;
+
         spin_lock_irq(&current->sighand->siglock);
         new_timer->it_signal = current->signal;
         list_add(&new_timer->list, &current->signal->posix_timers);
diff --git a/kernel/timer.c b/kernel/timer.c
index e3b8c697bde4..2454172a80d3 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -752,11 +752,15 @@ unsigned long apply_slack(struct timer_list *timer, unsigned long expires)
 
         expires_limit = expires;
 
-        if (timer->slack > -1)
+        if (timer->slack >= 0) {
                 expires_limit = expires + timer->slack;
-        else if (time_after(expires, jiffies)) /* auto slack: use 0.4% */
-                expires_limit = expires + (expires - jiffies)/256;
+        } else {
+                unsigned long now = jiffies;
 
+                /* No slack, if already expired else auto slack 0.4% */
+                if (time_after(expires, now))
+                        expires_limit = expires + (expires - now)/256;
+        }
         mask = expires ^ expires_limit;
         if (mask == 0)
                 return expires;