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Subject[PATCH 2/4] rcu: Add rcu_sync torture type to rcutorture
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Use the newly-generic synchronous deferred free function to implement torture
testing for RCU using synchronize_rcu rather than the asynchronous call_rcu.

Signed-off-by: Josh Triplett <josh@freedesktop.org>
---
Documentation/RCU/torture.txt | 7 ++++---
kernel/rcutorture.c | 17 +++++++++++++++--
2 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/Documentation/RCU/torture.txt b/Documentation/RCU/torture.txt
index 2180ef9..6714b53 100644
--- a/Documentation/RCU/torture.txt
+++ b/Documentation/RCU/torture.txt
@@ -53,9 +53,10 @@ test_no_idle_hz Whether or not to test t
a kernel that disables the scheduling-clock interrupt to
idle CPUs. Boolean parameter, "1" to test, "0" otherwise.

-torture_type The type of RCU to test: "rcu" for the rcu_read_lock()
- API, "rcu_bh" for the rcu_read_lock_bh() API, and "srcu"
- for the "srcu_read_lock()" API.
+torture_type The type of RCU to test: "rcu" for the rcu_read_lock() API,
+ "rcu_sync" for rcu_read_lock() with synchronous reclamation,
+ "rcu_bh" for the rcu_read_lock_bh() API, and "srcu" for the
+ "srcu_read_lock()" API.

verbose Enable debug printk()s. Default is disabled.

diff --git a/kernel/rcutorture.c b/kernel/rcutorture.c
index 6e2f0a8..1c329df 100644
--- a/kernel/rcutorture.c
+++ b/kernel/rcutorture.c
@@ -58,7 +58,7 @@ static int stat_interval; /* Interval be
static int verbose; /* Print more debug info. */
static int test_no_idle_hz; /* Test RCU's support for tickless idle CPUs. */
static int shuffle_interval = 5; /* Interval between shuffles (in sec)*/
-static char *torture_type = "rcu"; /* What to torture: rcu, rcu_bh, srcu. */
+static char *torture_type = "rcu"; /* What RCU implementation to torture. */

module_param(nreaders, int, 0);
MODULE_PARM_DESC(nreaders, "Number of RCU reader threads");
@@ -297,6 +297,19 @@ static void rcu_sync_torture_init(void)
INIT_LIST_HEAD(&rcu_torture_removed);
}

+static struct rcu_torture_ops rcu_sync_ops = {
+ .init = rcu_sync_torture_init,
+ .cleanup = NULL,
+ .readlock = rcu_torture_read_lock,
+ .readdelay = rcu_read_delay,
+ .readunlock = rcu_torture_read_unlock,
+ .completed = rcu_torture_completed,
+ .deferredfree = rcu_sync_torture_deferred_free,
+ .sync = synchronize_rcu,
+ .stats = NULL,
+ .name = "rcu_sync"
+};
+
/*
* Definitions for rcu_bh torture testing.
*/
@@ -439,7 +452,7 @@ static struct rcu_torture_ops srcu_ops =
};

static struct rcu_torture_ops *torture_ops[] =
- { &rcu_ops, &rcu_bh_ops, &srcu_ops, NULL };
+ { &rcu_ops, &rcu_sync_ops, &rcu_bh_ops, &srcu_ops, NULL };

/*
* RCU torture writer kthread. Repeatedly substitutes a new structure
--
1.4.1.1

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