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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 <[email protected]>
[ paulmck: Updated to eliminate #else in rcutiny.h as suggested by Josh ]
Reviewed-by: Josh Triplett <[email protected]>
This commit is contained in:
Paul E. McKenney 2013-03-27 08:44:00 -07:00
commit 127781d1ba
5 changed files with 5 additions and 887 deletions
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10
init/Kconfig
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@ -459,18 +459,10 @@ config TINY_RCU
is not required. This option greatly reduces the
memory footprint of RCU.
config TINY_PREEMPT_RCU
bool "Preemptible UP-only small-memory-footprint RCU"
depends on PREEMPT && !SMP
help
This option selects the RCU implementation that is designed
for real-time UP systems. This option greatly reduces the
memory footprint of RCU.
endchoice
config PREEMPT_RCU
def_bool ( TREE_PREEMPT_RCU || TINY_PREEMPT_RCU )
def_bool TREE_PREEMPT_RCU
help
This option enables preemptible-RCU code that is common between
the TREE_PREEMPT_RCU and TINY_PREEMPT_RCU implementations.