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rcu: Remove nohz_full full-system-idle state machine

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The NO_HZ_FULL_SYSIDLE full-system-idle capability was added in 2013
by commit 0edd1b1784 ("nohz_full: Add full-system-idle state machine"),
but has not been used.  This commit therefore removes it.

If it turns out to be needed later, this commit can always be reverted.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Paul E. McKenney
2017-05-11 11:26:22 -07:00
parent f7a10a9750
commit fe5ac724d8
9 changed files with 9 additions and 551 deletions
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9
include/linux/rcupdate.h
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@@ -854,15 +854,6 @@ static inline notrace void rcu_read_unlock_sched_notrace(void)
#define kfree_rcu(ptr, rcu_head) \
__kfree_rcu(&((ptr)->rcu_head), offsetof(typeof(*(ptr)), rcu_head))
/* Only for use by adaptive-ticks code. */
#ifdef CONFIG_NO_HZ_FULL_SYSIDLE
bool rcu_sys_is_idle(void);
void rcu_sysidle_force_exit(void);
#else /* #ifdef CONFIG_NO_HZ_FULL_SYSIDLE */
static inline bool rcu_sys_is_idle(void) { return false; }
static inline void rcu_sysidle_force_exit(void) { }
#endif /* #else #ifdef CONFIG_NO_HZ_FULL_SYSIDLE */
/*
* Place this after a lock-acquisition primitive to guarantee that