linux-kernel - [PATCH v2 rcu 10/13] rcutorture: Add srcu_read_lock_lite() support to rcutorture.reader

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Message-Id: <20241011173931.2050422-10-paulmck@kernel.org>
Date: Fri, 11 Oct 2024 10:39:28 -0700
From: "Paul E. McKenney" <paulmck@...nel.org>
To: frederic@...nel.org,
	rcu@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	kernel-team@...a.com,
	rostedt@...dmis.org,
	"Paul E. McKenney" <paulmck@...nel.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
Subject: [PATCH v2 rcu 10/13] 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 52922727006fc..203ec51e41d48 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 405decec33677..a313cdcb0960f 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))
-- 
2.40.1