[PATCH] Fix idle time field in /proc/uptime

Git commit 79741dd changes idle cputime accounting, but unfortunately
the /proc/uptime file hasn't caught up.  Here the idle time calculation
from /proc/stat is copied over.

Signed-off-by: Michael Abbott <michael.abbott@diamond.ac.uk>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/fs/proc/uptime.c b/fs/proc/uptime.c
index 0c10a0b3f146..766b1d456050 100644
--- a/fs/proc/uptime.c
+++ b/fs/proc/uptime.c
@@ -4,13 +4,18 @@
 #include <linux/sched.h>
 #include <linux/seq_file.h>
 #include <linux/time.h>
+#include <linux/kernel_stat.h>
 #include <asm/cputime.h>
 
 static int uptime_proc_show(struct seq_file *m, void *v)
 {
         struct timespec uptime;
         struct timespec idle;
-        cputime_t idletime = cputime_add(init_task.utime, init_task.stime);
+        int i;
+        cputime_t idletime = cputime_zero;
+
+        for_each_possible_cpu(i)
+                idletime = cputime64_add(idletime, kstat_cpu(i).cpustat.idle);
 
         do_posix_clock_monotonic_gettime(&uptime);
         monotonic_to_bootbased(&uptime);