tree c5e1ce04411e5a08980e5a5b7411632d893f1607
parent 8e6ce7ebeb34f0992f56de078c3744fb383657fa
author Konstantin Khlebnikov <khlebnikov@yandex-team.ru> 1468678136 +0300
committer David S. Miller <davem@davemloft.net> 1468907071 -0700

net/sched/sch_htb: clamp xstats tokens to fit into 32-bit int

In kernel HTB keeps tokens in signed 64-bit in nanoseconds. In netlink
protocol these values are converted into pshed ticks (64ns for now) and
truncated to 32-bit. In struct tc_htb_xstats fields "tokens" and "ctokens"
are declared as unsigned 32-bit but they could be negative thus tool 'tc'
prints them as signed. Big values loose higher bits and/or become negative.

This patch clamps tokens in xstat into range from INT_MIN to INT_MAX.
In this way it's easier to understand what's going on here.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>