From: Paul E. McKenney Date: Sun, 19 Jul 2020 21:40:31 +0000 (-0700) Subject: rcutorture: Properly set rcu_fwds for OOM handling X-Git-Tag: v5.9.2~352 X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=937ec6b33f5754a1cc373c5c3267a4099e1e69d3;p=users%2Fdwmw2%2Flinux.git rcutorture: Properly set rcu_fwds for OOM handling [ Upstream commit c8fa63714763b7795a3f5fb7ed6d000763e6dccc ] The conversion of rcu_fwds to dynamic allocation failed to actually allocate the required structure. This commit therefore allocates it, frees it, and updates rcu_fwds accordingly. While in the area, it abstracts the cleanup actions into rcu_torture_fwd_prog_cleanup(). Fixes: 5155be9994e5 ("rcutorture: Dynamically allocate rcu_fwds structure") Reported-by: kernel test robot Signed-off-by: Paul E. McKenney Signed-off-by: Sasha Levin --- diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index f453bf8d2f1ef..49202099692be 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -2160,9 +2160,20 @@ static int __init rcu_torture_fwd_prog_init(void) return -ENOMEM; spin_lock_init(&rfp->rcu_fwd_lock); rfp->rcu_fwd_cb_tail = &rfp->rcu_fwd_cb_head; + rcu_fwds = rfp; return torture_create_kthread(rcu_torture_fwd_prog, rfp, fwd_prog_task); } +static void rcu_torture_fwd_prog_cleanup(void) +{ + struct rcu_fwd *rfp; + + torture_stop_kthread(rcu_torture_fwd_prog, fwd_prog_task); + rfp = rcu_fwds; + rcu_fwds = NULL; + kfree(rfp); +} + /* Callback function for RCU barrier testing. */ static void rcu_torture_barrier_cbf(struct rcu_head *rcu) { @@ -2460,7 +2471,7 @@ rcu_torture_cleanup(void) show_rcu_gp_kthreads(); rcu_torture_read_exit_cleanup(); rcu_torture_barrier_cleanup(); - torture_stop_kthread(rcu_torture_fwd_prog, fwd_prog_task); + rcu_torture_fwd_prog_cleanup(); torture_stop_kthread(rcu_torture_stall, stall_task); torture_stop_kthread(rcu_torture_writer, writer_task);