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authorPaul E. McKenney <paulmck@us.ibm.com>2006-06-27 02:54:04 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-27 17:32:40 -0700
commitc32e066057fe0914da262c94e52cefb142f965b4 (patch)
treec429649e39af7925a443c72f180349a451c7acbe
parent72e9bb549280b354311af30640c9433474f3a32c (diff)
[PATCH] rcutorture: add call_rcu_bh() operations
Add operations for the call_rcu_bh() variant of RCU. Also add an rcu_batches_completed_bh() function, which is needed by rcutorture. Signed-off-by: Paul E. McKenney <paulmck@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--include/linux/rcupdate.h1
-rw-r--r--kernel/rcupdate.c10
-rw-r--r--kernel/rcutorture.c40
3 files changed, 49 insertions, 2 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index 6312758393b..48dfe00070c 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -258,6 +258,7 @@ extern void rcu_init(void);
extern void rcu_check_callbacks(int cpu, int user);
extern void rcu_restart_cpu(int cpu);
extern long rcu_batches_completed(void);
+extern long rcu_batches_completed_bh(void);
/* Exported interfaces */
extern void FASTCALL(call_rcu(struct rcu_head *head,
diff --git a/kernel/rcupdate.c b/kernel/rcupdate.c
index 20e9710fc21..c0e1cb95dd4 100644
--- a/kernel/rcupdate.c
+++ b/kernel/rcupdate.c
@@ -182,6 +182,15 @@ long rcu_batches_completed(void)
return rcu_ctrlblk.completed;
}
+/*
+ * Return the number of RCU batches processed thus far. Useful
+ * for debug and statistics.
+ */
+long rcu_batches_completed_bh(void)
+{
+ return rcu_bh_ctrlblk.completed;
+}
+
static void rcu_barrier_callback(struct rcu_head *notused)
{
if (atomic_dec_and_test(&rcu_barrier_cpu_count))
@@ -619,6 +628,7 @@ module_param(qlowmark, int, 0);
module_param(rsinterval, int, 0);
#endif
EXPORT_SYMBOL_GPL(rcu_batches_completed);
+EXPORT_SYMBOL_GPL(rcu_batches_completed_bh);
EXPORT_SYMBOL_GPL(call_rcu);
EXPORT_SYMBOL_GPL(call_rcu_bh);
EXPORT_SYMBOL_GPL(synchronize_rcu);
diff --git a/kernel/rcutorture.c b/kernel/rcutorture.c
index c96b5edd6ed..4d1c3d24712 100644
--- a/kernel/rcutorture.c
+++ b/kernel/rcutorture.c
@@ -66,7 +66,7 @@ MODULE_PARM_DESC(test_no_idle_hz, "Test support for tickless idle CPUs");
module_param(shuffle_interval, int, 0);
MODULE_PARM_DESC(shuffle_interval, "Number of seconds between shuffles");
module_param(torture_type, charp, 0);
-MODULE_PARM_DESC(torture_type, "Type of RCU to torture (rcu)");
+MODULE_PARM_DESC(torture_type, "Type of RCU to torture (rcu, rcu_bh)");
#define TORTURE_FLAG "-torture:"
#define PRINTK_STRING(s) \
@@ -246,8 +246,44 @@ static struct rcu_torture_ops rcu_ops = {
.name = "rcu"
};
+/*
+ * Definitions for rcu_bh torture testing.
+ */
+
+static int rcu_bh_torture_read_lock(void)
+{
+ rcu_read_lock_bh();
+ return 0;
+}
+
+static void rcu_bh_torture_read_unlock(int idx)
+{
+ rcu_read_unlock_bh();
+}
+
+static int rcu_bh_torture_completed(void)
+{
+ return rcu_batches_completed_bh();
+}
+
+static void rcu_bh_torture_deferred_free(struct rcu_torture *p)
+{
+ call_rcu_bh(&p->rtort_rcu, rcu_torture_cb);
+}
+
+static struct rcu_torture_ops rcu_bh_ops = {
+ .init = NULL,
+ .cleanup = NULL,
+ .readlock = rcu_bh_torture_read_lock,
+ .readunlock = rcu_bh_torture_read_unlock,
+ .completed = rcu_bh_torture_completed,
+ .deferredfree = rcu_bh_torture_deferred_free,
+ .stats = NULL,
+ .name = "rcu_bh"
+};
+
static struct rcu_torture_ops *torture_ops[] =
- { &rcu_ops, NULL };
+ { &rcu_ops, &rcu_bh_ops, NULL };
/*
* RCU torture writer kthread. Repeatedly substitutes a new structure