From: "Paul E. McKenney" <paulmck@xxxxxxxxxx>
This commit causes bit 0x4 of rcutorture.reader_flavor to select the new
srcu_read_lock_lite() and srcu_read_unlock_lite() functions.
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx>
Cc: Alexei Starovoitov <ast@xxxxxxxxxx>
Cc: Andrii Nakryiko <andrii@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Kent Overstreet <kent.overstreet@xxxxxxxxx>
Cc: <bpf@xxxxxxxxxxxxxxx>
Reviewed-by: Neeraj Upadhyay <Neeraj.Upadhyay@xxxxxxx>
Signed-off-by: Frederic Weisbecker <frederic@xxxxxxxxxx>
---
Documentation/admin-guide/kernel-parameters.txt | 4 ++--
kernel/rcu/rcutorture.c | 7 +++++++
2 files changed, 9 insertions(+), 2 deletions(-)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 52922727006f..203ec51e41d4 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -5431,8 +5431,8 @@
If there is more than one bit set, the readers
are entered from low-order bit up, and are
exited in the opposite order. For SRCU, the
- 0x1 bit is normal readers and the 0x2 bit is
- for NMI-safe readers.
+ 0x1 bit is normal readers, 0x2 NMI-safe readers,
+ and 0x4 light-weight readers.
rcutorture.shuffle_interval= [KNL]
Set task-shuffle interval (s). Shuffling tasks
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 405decec3367..a313cdcb0960 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -658,6 +658,11 @@ static int srcu_torture_read_lock(void)
WARN_ON_ONCE(idx & ~0x1);
ret += idx << 1;
}
+ if (reader_flavor & 0x4) {
+ idx = srcu_read_lock_lite(srcu_ctlp);
+ WARN_ON_ONCE(idx & ~0x1);
+ ret += idx << 2;
+ }
return ret;
}
@@ -683,6 +688,8 @@ srcu_read_delay(struct torture_random_state *rrsp, struct rt_read_seg *rtrsp)
static void srcu_torture_read_unlock(int idx)
{
WARN_ON_ONCE((reader_flavor && (idx & ~reader_flavor)) || (!reader_flavor && (idx & ~0x1)));
+ if (reader_flavor & 0x4)
+ srcu_read_unlock_lite(srcu_ctlp, (idx & 0x4) >> 2);
if (reader_flavor & 0x2)
srcu_read_unlock_nmisafe(srcu_ctlp, (idx & 0x2) >> 1);
if ((reader_flavor & 0x1) || !(reader_flavor & 0x7))
--
2.46.0
