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rcu: Make PREEMPT_RCU be a modifier to TREE_RCU

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Currently PREEMPT_RCU and TREE_RCU are mutually exclusive Kconfig
options.  But PREEMPT_RCU actually specifies a kind of TREE_RCU,
namely a preemptible TREE_RCU. This commit therefore makes PREEMPT_RCU
be a modifer to the TREE_RCU Kconfig option.  This has the benefit of
simplifying several of the #if expressions that formerly needed to
check both, but now need only check one or the other.

Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com>
Signed-off-by: Lai Jiangshan <jiangshanlai@gmail.com>
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Lai Jiangshan 2019-10-15 02:55:57 +00:00 • committed by Paul E. McKenney
parent 03bd2983d7
commit b3e627d3d5
7 changed files with 14 additions and 14 deletions
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4
include/linux/rcupdate.h
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@ -167,7 +167,7 @@ do { \
* TREE_RCU and rcu_barrier_() primitives in TINY_RCU.
*/
#if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
#if defined(CONFIG_TREE_RCU)
#include <linux/rcutree.h>
#elif defined(CONFIG_TINY_RCU)
#include <linux/rcutiny.h>
@ -601,7 +601,7 @@ do { \
* read-side critical section that would block in a !PREEMPT kernel.
* But if you want the full story, read on!
*
* In non-preemptible RCU implementations (TREE_RCU and TINY_RCU),
* In non-preemptible RCU implementations (pure TREE_RCU and TINY_RCU),
* it is illegal to block while in an RCU read-side critical section.
* In preemptible RCU implementations (PREEMPT_RCU) in CONFIG_PREEMPTION
* kernel builds, RCU read-side critical sections may be preempted,