Messages in this thread Patch in this message | | | From | paulmck@kernel ... | Subject | [PATCH tip/core/rcu 10/12] rcutorture: Dynamically allocate rcu_fwds structure | Date | Mon, 9 Dec 2019 19:42:15 -0800 |
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From: "Paul E. McKenney" <paulmck@kernel.org>
This commit switches from static structure to dynamic allocation for rcu_fwds as another step towards providing multiple call_rcu() forward-progress kthreads.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org> --- kernel/rcu/rcutorture.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index 394baac..f77f4d8 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -1686,7 +1686,7 @@ struct rcu_fwd { unsigned long rcu_launder_gp_seq_start; }; -struct rcu_fwd rcu_fwds; +struct rcu_fwd *rcu_fwds; bool rcu_fwd_emergency_stop; static void rcu_torture_fwd_cb_hist(struct rcu_fwd *rfp) @@ -1952,7 +1952,7 @@ static void rcu_torture_fwd_prog_cr(struct rcu_fwd *rfp) static int rcutorture_oom_notify(struct notifier_block *self, unsigned long notused, void *nfreed) { - struct rcu_fwd *rfp = &rcu_fwds; + struct rcu_fwd *rfp = rcu_fwds; WARN(1, "%s invoked upon OOM during forward-progress testing.\n", __func__); @@ -2010,7 +2010,7 @@ static int rcu_torture_fwd_prog(void *args) /* If forward-progress checking is requested and feasible, spawn the thread. */ static int __init rcu_torture_fwd_prog_init(void) { - struct rcu_fwd *rfp = &rcu_fwds; + struct rcu_fwd *rfp; if (!fwd_progress) return 0; /* Not requested, so don't do it. */ @@ -2026,12 +2026,15 @@ static int __init rcu_torture_fwd_prog_init(void) WARN_ON(1); /* Make sure rcutorture notices conflict. */ return 0; } - spin_lock_init(&rfp->rcu_fwd_lock); - rfp->rcu_fwd_cb_tail = &rfp->rcu_fwd_cb_head; if (fwd_progress_holdoff <= 0) fwd_progress_holdoff = 1; if (fwd_progress_div <= 0) fwd_progress_div = 4; + rfp = kzalloc(sizeof(*rfp), GFP_KERNEL); + if (!rfp) + return -ENOMEM; + spin_lock_init(&rfp->rcu_fwd_lock); + rfp->rcu_fwd_cb_tail = &rfp->rcu_fwd_cb_head; return torture_create_kthread(rcu_torture_fwd_prog, rfp, fwd_prog_task); } -- 2.9.5
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