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rcu: Remove now-unused ->b.exp_need_qs field from the rcu_special union

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The ->b.exp_need_qs field is now set only to false, so this commit
removes it.  The job this field used to do is now done by the rcu_data
structure's ->deferred_qs field, which is a consequence of a better
split between task-based (the rcu_node structure's ->exp_tasks field) and
CPU-based (the aforementioned rcu_data structure's ->deferred_qs field)
tracking of quiescent states for RCU-preempt expedited grace periods.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney
2018-06-28 07:39:59 -07:00
parent 27c744e32a
commit fcc878e4df
2 changed files with 5 additions and 14 deletions
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6
include/linux/sched.h
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@@ -571,12 +571,8 @@ union rcu_special {
struct {
u8 blocked;
u8 need_qs;
u8 exp_need_qs;
/* Otherwise the compiler can store garbage here: */
u8 pad;
} b; /* Bits. */
u32 s; /* Set of bits. */
u16 s; /* Set of bits. */
};
enum perf_event_task_context {