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Message-Id: <20240903163318.480678-10-paulmck@kernel.org>
Date: Tue, 3 Sep 2024 09:33:17 -0700
From: "Paul E. McKenney" <paulmck@...nel.org>
To: rcu@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
kernel-team@...a.com,
rostedt@...dmis.org,
Alexei Starovoitov <ast@...nel.org>,
Andrii Nakryiko <andrii@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Kent Overstreet <kent.overstreet@...ux.dev>,
bpf@...r.kernel.org,
"Paul E. McKenney" <paulmck@...nel.org>
Subject: [PATCH rcu 10/11] rcutorture: Add srcu_read_lock_lite() support to rcutorture.reader_flavor
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@...nel.org>
Cc: Alexei Starovoitov <ast@...nel.org>
Cc: Andrii Nakryiko <andrii@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Kent Overstreet <kent.overstreet@...ux.dev>
Cc: <bpf@...r.kernel.org>
---
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 e107c82f0b21b..39bf8ce17e992 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -5357,8 +5357,8 @@
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 1a3e0fdca7139..306a449bbad87 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -660,6 +660,11 @@ 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;
}
@@ -685,6 +690,8 @@ 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))
--
2.40.1
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