From: Josh Triplett 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 Acked-by: Paul E. McKenney Signed-off-by: Andrew Morton --- Documentation/RCU/torture.txt | 7 ++++--- kernel/rcutorture.c | 17 +++++++++++++++-- 2 files changed, 19 insertions(+), 5 deletions(-) diff -puN Documentation/RCU/torture.txt~rcu-add-rcu_sync-torture-type-to-rcutorture Documentation/RCU/torture.txt --- a/Documentation/RCU/torture.txt~rcu-add-rcu_sync-torture-type-to-rcutorture +++ a/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 -puN kernel/rcutorture.c~rcu-add-rcu_sync-torture-type-to-rcutorture kernel/rcutorture.c --- a/kernel/rcutorture.c~rcu-add-rcu_sync-torture-type-to-rcutorture +++ a/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 _