1 files changed, 4 insertions, 70 deletions

diff --git a/fs/proc/array.c b/fs/proc/array.c
index 0d6eb33597c6..bb9f4b05703d 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -86,11 +86,6 @@
 #include <asm/processor.h>
 #include "internal.h"
 
-/* Gcc optimizes away "strlen(x)" for constant x */
-#define ADDBUF(buffer, string) \
-do { memcpy(buffer, string, strlen(string)); \
-     buffer += strlen(string); } while (0)
-
 static inline void task_name(struct seq_file *m, struct task_struct *p)
 {
         int i;
@@ -261,7 +256,6 @@ static inline void task_sig(struct seq_file *m, struct task_struct *p)
         sigemptyset(&ignored);
         sigemptyset(&caught);
 
-        rcu_read_lock();
         if (lock_task_sighand(p, &flags)) {
                 pending = p->pending.signal;
                 shpending = p->signal->shared_pending.signal;
@@ -272,7 +266,6 @@ static inline void task_sig(struct seq_file *m, struct task_struct *p)
                 qlim = p->signal->rlim[RLIMIT_SIGPENDING].rlim_cur;
                 unlock_task_sighand(p, &flags);
         }
-        rcu_read_unlock();
 
         seq_printf(m, "Threads:\t%d\n", num_threads);
         seq_printf(m, "SigQ:\t%lu/%lu\n", qsize, qlim);
@@ -337,65 +330,6 @@ int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
         return 0;
 }
 
-/*
- * Use precise platform statistics if available:
- */
-#ifdef CONFIG_VIRT_CPU_ACCOUNTING
-static cputime_t task_utime(struct task_struct *p)
-{
-        return p->utime;
-}
-
-static cputime_t task_stime(struct task_struct *p)
-{
-        return p->stime;
-}
-#else
-static cputime_t task_utime(struct task_struct *p)
-{
-        clock_t utime = cputime_to_clock_t(p->utime),
-                total = utime + cputime_to_clock_t(p->stime);
-        u64 temp;
-
-        /*
-         * Use CFS's precise accounting:
-         */
-        temp = (u64)nsec_to_clock_t(p->se.sum_exec_runtime);
-
-        if (total) {
-                temp *= utime;
-                do_div(temp, total);
-        }
-        utime = (clock_t)temp;
-
-        p->prev_utime = max(p->prev_utime, clock_t_to_cputime(utime));
-        return p->prev_utime;
-}
-
-static cputime_t task_stime(struct task_struct *p)
-{
-        clock_t stime;
-
-        /*
-         * Use CFS's precise accounting. (we subtract utime from
-         * the total, to make sure the total observed by userspace
-         * grows monotonically - apps rely on that):
-         */
-        stime = nsec_to_clock_t(p->se.sum_exec_runtime) -
-                        cputime_to_clock_t(task_utime(p));
-
-        if (stime >= 0)
-                p->prev_stime = max(p->prev_stime, clock_t_to_cputime(stime));
-
-        return p->prev_stime;
-}
-#endif
-
-static cputime_t task_gtime(struct task_struct *p)
-{
-        return p->gtime;
-}
-
 static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
                         struct pid *pid, struct task_struct *task, int whole)
 {
@@ -454,20 +388,20 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
 
                 /* add up live thread stats at the group level */
                 if (whole) {
+                        struct task_cputime cputime;
                         struct task_struct *t = task;
                         do {
                                 min_flt += t->min_flt;
                                 maj_flt += t->maj_flt;
-                                utime = cputime_add(utime, task_utime(t));
-                                stime = cputime_add(stime, task_stime(t));
                                 gtime = cputime_add(gtime, task_gtime(t));
                                 t = next_thread(t);
                         } while (t != task);
 
                         min_flt += sig->min_flt;
                         maj_flt += sig->maj_flt;
-                        utime = cputime_add(utime, sig->utime);
-                        stime = cputime_add(stime, sig->stime);
+                        thread_group_cputime(task, &cputime);
+                        utime = cputime.utime;
+                        stime = cputime.stime;
                         gtime = cputime_add(gtime, sig->gtime);
                 }