[PATCH 07/34] rcu: Remove ->trc_reader_special from task_struct

[Paul E. McKenney]

Now that RCU Tasks Trace has been re-implemented in terms of SRCU-fast,
and no-longer-needed quiescent-state functions have been removed, the
->trc_reader_special task_struct field is only initialized, and never
actually used.  This commit therefore removes it.

Signed-off-by: Paul E. McKenney <paul...@kernel.org>
Cc: Andrii Nakryiko <and...@kernel.org>
Cc: Alexei Starovoitov <a...@kernel.org>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: <b...@vger.kernel.org>
---
 include/linux/sched.h | 1 -
 init/init_task.c      | 1 -
 kernel/fork.c         | 1 -
 3 files changed, 3 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index e62c99e44a5502..577fafd22a0e6f 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -940,7 +940,6 @@ struct task_struct {
 #ifdef CONFIG_TASKS_TRACE_RCU
        int                             trc_reader_nesting;
        struct srcu_ctr __percpu        *trc_reader_scp;
-       union rcu_special               trc_reader_special;
 #endif /* #ifdef CONFIG_TASKS_TRACE_RCU */
 
        struct sched_info               sched_info;
diff --git a/init/init_task.c b/init/init_task.c
index 91c37f66ec8e9a..0c075f3cc8fc5a 100644
--- a/init/init_task.c
+++ b/init/init_task.c
@@ -165,7 +165,6 @@ struct task_struct init_task __aligned(L1_CACHE_BYTES) = {
 #endif
 #ifdef CONFIG_TASKS_TRACE_RCU
        .trc_reader_nesting = 0,
-       .trc_reader_special.s = 0,
 #endif
 #ifdef CONFIG_CPUSETS
        .mems_allowed_seq = SEQCNT_SPINLOCK_ZERO(init_task.mems_allowed_seq,
diff --git a/kernel/fork.c b/kernel/fork.c
index 12388e895d2955..5686d50b62cfaf 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1780,7 +1780,6 @@ static inline void rcu_copy_process(struct task_struct *p)
 #endif /* #ifdef CONFIG_TASKS_RCU */
 #ifdef CONFIG_TASKS_TRACE_RCU
        p->trc_reader_nesting = 0;
-       p->trc_reader_special.s = 0;
 #endif /* #ifdef CONFIG_TASKS_TRACE_RCU */
 }
 
-- 
2.40.1