[PATCH] proc: fix /proc/loadavg regression

[Alexey Dobriyan]

commit 95846ecf9dac5089aed4b144d912225f8ef86ae4
"pid: replace pid bitmap implementation with IDR API"

changed last field of /proc/loadavg (last pid allocated)
to be off by one:

        # unshare -p -f --mount-proc cat /proc/loadavg
        0.00 0.00 0.00 1/60 2   <===

It should be 1 after first fork into pid namespace.

This is formally a regression but given how useless this field is
I don't think anyone is affected.

Bug was found by /proc testsuite!

Signed-off-by: Alexey Dobriyan <adobri...@gmail.com>
---

 arch/powerpc/platforms/cell/spufs/sched.c |    2 +-
 fs/proc/loadavg.c                         |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

--- a/arch/powerpc/platforms/cell/spufs/sched.c
+++ b/arch/powerpc/platforms/cell/spufs/sched.c
@@ -1093,7 +1093,7 @@ static int show_spu_loadavg(struct seq_file *s, void 
*private)
                LOAD_INT(c), LOAD_FRAC(c),
                count_active_contexts(),
                atomic_read(&nr_spu_contexts),
-               idr_get_cursor(&task_active_pid_ns(current)->idr));
+               idr_get_cursor(&task_active_pid_ns(current)->idr) - 1);
        return 0;
 }
 
--- a/fs/proc/loadavg.c
+++ b/fs/proc/loadavg.c
@@ -24,7 +24,7 @@ static int loadavg_proc_show(struct seq_file *m, void *v)
                LOAD_INT(avnrun[1]), LOAD_FRAC(avnrun[1]),
                LOAD_INT(avnrun[2]), LOAD_FRAC(avnrun[2]),
                nr_running(), nr_threads,
-               idr_get_cursor(&task_active_pid_ns(current)->idr));
+               idr_get_cursor(&task_active_pid_ns(current)->idr) - 1);
        return 0;
 }