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rcu: Remove TINY_PREEMPT_RCU

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TINY_PREEMPT_RCU adds significant code and complexity, but does not
offer commensurate benefits.  People currently using TINY_PREEMPT_RCU
can get much better memory footprint with TINY_RCU, or, if they really
need preemptible RCU, they can use TREE_PREEMPT_RCU with a relatively
minor degradation in memory footprint.  Please note that this move
has been widely publicized on LKML (https://lkml.org/lkml/2012/11/12/545)
and on LWN (http://lwn.net/Articles/541037/).

This commit therefore removes TINY_PREEMPT_RCU.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
[ paulmck: Updated to eliminate #else in rcutiny.h as suggested by Josh ]
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
This commit is contained in:
Paul E. McKenney 2013-03-27 08:44:00 -07:00
parent efc151c33b
commit 127781d1ba
5 changed files with 5 additions and 887 deletions
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24
include/linux/rcutiny.h
View file

@ -53,16 +53,7 @@ static inline void rcu_barrier(void)
rcu_barrier_sched(); /* Only one CPU, so only one list of callbacks! */
}
#else /* #ifdef CONFIG_TINY_RCU */
void synchronize_rcu_expedited(void);
static inline void rcu_barrier(void)
{
wait_rcu_gp(call_rcu);
}
#endif /* #else #ifdef CONFIG_TINY_RCU */
#endif /* #ifdef CONFIG_TINY_RCU */
static inline void synchronize_rcu_bh(void)
{
@ -97,18 +88,7 @@ static inline int rcu_needs_cpu(int cpu, unsigned long *delta_jiffies)
return 0;
}
#else /* #ifdef CONFIG_TINY_RCU */
void rcu_preempt_note_context_switch(void);
int rcu_preempt_needs_cpu(void);
static inline int rcu_needs_cpu(int cpu, unsigned long *delta_jiffies)
{
*delta_jiffies = ULONG_MAX;
return rcu_preempt_needs_cpu();
}
#endif /* #else #ifdef CONFIG_TINY_RCU */
#endif /* #ifdef CONFIG_TINY_RCU */
static inline void rcu_note_context_switch(int cpu)
{