sched: Fix possible divide by zero in avg_atom() calculation

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 <mguzik@redhat.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/1402750809-31991-1-git-send-email-mguzik@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
[bwh: Backported to 3.2: adjust filename]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c
index f4010e2..704ffe3 100644 (file)
--- a/kernel/sched_debug.c
+++ b/kernel/sched_debug.c
@@ -467,7 +467,7 @@ 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;