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| author |   Paul E. McKenney <paulmck@kernel.org> | 2020-11-15 12:45:57 -0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2021-01-04 13:53:40 -0800 |
| commit | bc480a6354ef2e15c26c3bdbd0db647026e788a7 (patch) | |
| tree | f36fbedbbc1e0039ce0196c87a4a6cbc2f63b244 /kernel/rcu/rcutorture.c | |
| parent | rcutorture: Add writer-side tests of polling grace-period API (diff) | |
| download | linux-dev-bc480a6354ef2e15c26c3bdbd0db647026e788a7.tar.xz linux-dev-bc480a6354ef2e15c26c3bdbd0db647026e788a7.zip | |
rcutorture: Add reader-side tests of polling grace-period API
This commit adds reader-side testing of the polling grace-period API.
This testing verifies that a cookie obtained in an SRCU read-side critical
section does not get a true return from poll_state_synchronize_srcu()
within that same critical section.
Link: https://lore.kernel.org/rcu/20201112201547.GF3365678@moria.home.lan/
Reported-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/rcu/rcutorture.c')
| -rw-r--r-- | kernel/rcu/rcutorture.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index 78ba95dfe05d..96d55f05e344 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -1429,6 +1429,7 @@ rcutorture_loop_extend(int *readstate, struct torture_random_state *trsp, */ static bool rcu_torture_one_read(struct torture_random_state *trsp) { + unsigned long cookie; int i; unsigned long started; unsigned long completed; @@ -1444,6 +1445,8 @@ static bool rcu_torture_one_read(struct torture_random_state *trsp) WARN_ON_ONCE(!rcu_is_watching()); newstate = rcutorture_extend_mask(readstate, trsp); rcutorture_one_extend(&readstate, newstate, trsp, rtrsp++); + if (cur_ops->get_gp_state && cur_ops->poll_gp_state) + cookie = cur_ops->get_gp_state(); started = cur_ops->get_gp_seq(); ts = rcu_trace_clock_local(); p = rcu_dereference_check(rcu_torture_current, @@ -1480,6 +1483,13 @@ static bool rcu_torture_one_read(struct torture_random_state *trsp) } __this_cpu_inc(rcu_torture_batch[completed]); preempt_enable(); + if (cur_ops->get_gp_state && cur_ops->poll_gp_state) + WARN_ONCE(cur_ops->poll_gp_state(cookie), + "%s: Cookie check 3 failed %s(%d) %lu->%lu\n", + __func__, + rcu_torture_writer_state_getname(), + rcu_torture_writer_state, + cookie, cur_ops->get_gp_state()); rcutorture_one_extend(&readstate, 0, trsp, rtrsp); WARN_ON_ONCE(readstate & RCUTORTURE_RDR_MASK); // This next splat is expected behavior if leakpointer, especially |