• Paul E. McKenney's avatar
    cpu: Avoid puts_pending overflow · 62db99f4
    Paul E. McKenney authored
    A long string of get_online_cpus() with each followed by a
    put_online_cpu() that fails to acquire cpu_hotplug.lock can result in
    overflow of the cpu_hotplug.puts_pending counter.  Although this is
    perhaps improbably, a system with absolutely no CPU-hotplug operations
    will have an arbitrarily long time in which this overflow could occur.
    This commit therefore adds overflow checks to get_online_cpus() and
    try_get_online_cpus().
    Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
    Reviewed-by: default avatarPranith Kumar <bobby.prani@gmail.com>
    62db99f4
cpu.c 19.4 KB