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rcu: Remove rsp parameter from dump_blkd_tasks() and friend 

There now is only one rcu_state structure in a given build of the
Linux kernel, so there is no need to pass it as a parameter to RCU's
functions.  This commit therefore removes the rsp parameter from
dump_blkd_tasks() and rcu_preempt_blocked_readers_cgp().

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2018-07-03 17:22:34 -07:00
parent a2887cd85f
commit 81ab59a3ad
3 changed files with 9 additions and 13 deletions
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4
kernel/rcu/tree.c
View File

@ -1937,7 +1937,7 @@ static bool rcu_gp_init(void)
rcu_gp_slow(gp_init_delay);
raw_spin_lock_irqsave_rcu_node(rnp, flags);
rdp = this_cpu_ptr(&rcu_data);
rcu_preempt_check_blocked_tasks(rsp, rnp);
rcu_preempt_check_blocked_tasks(rnp);
rnp->qsmask = rnp->qsmaskinit;
WRITE_ONCE(rnp->gp_seq, rsp->gp_seq);
if (rnp == rdp->mynode)
@ -2049,7 +2049,7 @@ static void rcu_gp_cleanup(void)
rcu_for_each_node_breadth_first(rsp, rnp) {
raw_spin_lock_irq_rcu_node(rnp);
if (WARN_ON_ONCE(rcu_preempt_blocked_readers_cgp(rnp)))
dump_blkd_tasks(rsp, rnp, 10);
dump_blkd_tasks(rnp, 10);
WARN_ON_ONCE(rnp->qsmask);
WRITE_ONCE(rnp->gp_seq, new_gp_seq);
rdp = this_cpu_ptr(&rcu_data);

6
kernel/rcu/tree.h
View File

@ -455,12 +455,10 @@ static bool rcu_preempt_has_tasks(struct rcu_node *rnp);
static void rcu_print_detail_task_stall(void);
static int rcu_print_task_stall(struct rcu_node *rnp);
static int rcu_print_task_exp_stall(struct rcu_node *rnp);
static void rcu_preempt_check_blocked_tasks(struct rcu_state *rsp,
struct rcu_node *rnp);
static void rcu_preempt_check_blocked_tasks(struct rcu_node *rnp);
static void rcu_flavor_check_callbacks(int user);
void call_rcu(struct rcu_head *head, rcu_callback_t func);
static void dump_blkd_tasks(struct rcu_state *rsp, struct rcu_node *rnp,
int ncheck);
static void dump_blkd_tasks(struct rcu_node *rnp, int ncheck);
static void rcu_initiate_boost(struct rcu_node *rnp, unsigned long flags);
static void rcu_preempt_boost_start_gp(struct rcu_node *rnp);
static void invoke_rcu_callbacks_kthread(void);

12
kernel/rcu/tree_plugin.h
View File

@ -756,14 +756,13 @@ static int rcu_print_task_exp_stall(struct rcu_node *rnp)
* Also, if there are blocked tasks on the list, they automatically
* block the newly created grace period, so set up ->gp_tasks accordingly.
*/
static void
rcu_preempt_check_blocked_tasks(struct rcu_state *rsp, struct rcu_node *rnp)
static void rcu_preempt_check_blocked_tasks(struct rcu_node *rnp)
{
struct task_struct *t;
RCU_LOCKDEP_WARN(preemptible(), "rcu_preempt_check_blocked_tasks() invoked with preemption enabled!!!\n");
if (WARN_ON_ONCE(rcu_preempt_blocked_readers_cgp(rnp)))
dump_blkd_tasks(rsp, rnp, 10);
dump_blkd_tasks(rnp, 10);
if (rcu_preempt_has_tasks(rnp) &&
(rnp->qsmaskinit || rnp->wait_blkd_tasks)) {
rnp->gp_tasks = rnp->blkd_tasks.next;
@ -884,7 +883,7 @@ void exit_rcu(void)
* specified number of elements.
*/
static void
dump_blkd_tasks(struct rcu_state *rsp, struct rcu_node *rnp, int ncheck)
dump_blkd_tasks(struct rcu_node *rnp, int ncheck)
{
int cpu;
int i;
@ -1033,8 +1032,7 @@ static int rcu_print_task_exp_stall(struct rcu_node *rnp)
* so there is no need to check for blocked tasks. So check only for
* bogus qsmask values.
*/
static void
rcu_preempt_check_blocked_tasks(struct rcu_state *rsp, struct rcu_node *rnp)
static void rcu_preempt_check_blocked_tasks(struct rcu_node *rnp)
{
WARN_ON_ONCE(rnp->qsmask);
}
@ -1095,7 +1093,7 @@ void exit_rcu(void)
* Dump the guaranteed-empty blocked-tasks state. Trust but verify.
*/
static void
dump_blkd_tasks(struct rcu_state *rsp, struct rcu_node *rnp, int ncheck)
dump_blkd_tasks(struct rcu_node *rnp, int ncheck)
{
WARN_ON_ONCE(!list_empty(&rnp->blkd_tasks));
}