rcu: Remove TINY_PREEMPT_RCU
authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Wed, 27 Mar 2013 15:44:00 +0000 (08:44 -0700)
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Mon, 10 Jun 2013 20:45:49 +0000 (13:45 -0700)
commit127781d1ba1ee5bbe1780afa35dd0e71583b143d
tree3c9b5961bc02e7f380a7bd7932181329ecbec397
parentefc151c33b971148894789dc7c5589dec46d4348
rcu: Remove TINY_PREEMPT_RCU

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>
include/linux/hardirq.h
include/linux/rcupdate.h
include/linux/rcutiny.h
init/Kconfig
kernel/rcutiny_plugin.h