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rcutorture: Don't do need_resched() testing if ->sync is NULL

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If cur_ops->sync is NULL, rcu_torture_fwd_prog_nr() will nevertheless
attempt to call through it.  This commit therefore flags cases where
neither need_resched() nor call_rcu() forward-progress testing
can be performed due to NULL function pointers, and also causes
rcu_torture_fwd_prog_nr() to take an early exit if cur_ops->sync()
is NULL.

Reported-by: Tom Rix <trix@redhat.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2020-10-09 19:51:55 -07:00
parent 0d7202876b
commit a7eb937b67
1 changed files with 5 additions and 3 deletions
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8
kernel/rcu/rcutorture.c
View file

@ -1923,7 +1923,9 @@ static void rcu_torture_fwd_prog_nr(struct rcu_fwd *rfp,
unsigned long stopat;
static DEFINE_TORTURE_RANDOM(trs);
if (cur_ops->call && cur_ops->sync && cur_ops->cb_barrier) {
if (!cur_ops->sync)
return; // Cannot do need_resched() forward progress testing without ->sync.
if (cur_ops->call && cur_ops->cb_barrier) {
init_rcu_head_on_stack(&fcs.rh);
selfpropcb = true;
}
@ -2149,8 +2151,8 @@ static int __init rcu_torture_fwd_prog_init(void)
if (!fwd_progress)
return 0; /* Not requested, so don't do it. */
if (!cur_ops->stall_dur || cur_ops->stall_dur() <= 0 ||
cur_ops == &rcu_busted_ops) {
if ((!cur_ops->sync && !cur_ops->call) ||
!cur_ops->stall_dur || cur_ops->stall_dur() <= 0 || cur_ops == &rcu_busted_ops) {
VERBOSE_TOROUT_STRING("rcu_torture_fwd_prog_init: Disabled, unsupported by RCU flavor under test");
return 0;
}