3.11.10.15 -stable review patch. If anyone has any objections, please let me
know.
------------------
From: Mateusz Guzik <mgu...@redhat.com>
commit b0ab99e7736af88b8ac1b7ae50ea287fffa2badc upstream.
proc_sched_show_task() does:
if (nr_switches)
do_div(avg_atom, nr_switches);
nr_switches is unsigned long and do_div truncates it to 32 bits, which
means it can test non-zero on e.g. x86-64 and be truncated to zero for
division.
Fix the problem by using div64_ul() instead.
As a side effect calculations of avg_atom for big nr_switches are now correct.
Signed-off-by: Mateusz Guzik <mgu...@redhat.com>
Signed-off-by: Peter Zijlstra <pet...@infradead.org>
Cc: Linus Torvalds <torva...@linux-foundation.org>
Link:
http://lkml.kernel.org/r/1402750809-31991-1-git-send-email-mgu...@redhat.com
Signed-off-by: Ingo Molnar <mi...@kernel.org>
Signed-off-by: Luis Henriques <luis.henriq...@canonical.com>
---
kernel/sched/debug.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 631daf2612c1..8304ee67c56b 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -554,7 +554,7 @@ void proc_sched_show_task(struct task_struct *p, struct
seq_file *m)
avg_atom = p->se.sum_exec_runtime;
if (nr_switches)
- do_div(avg_atom, nr_switches);
+ avg_atom = div64_ul(avg_atom, nr_switches);
else
avg_atom = -1LL;
--
1.9.1
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