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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
rcu: Remove redundant TREE_PREEMPT_RCU config option
PREEMPT_RCU and TREE_PREEMPT_RCU serve the same function after
TINY_PREEMPT_RCU has been removed. This patch removes TREE_PREEMPT_RCU
and uses PREEMPT_RCU config option in its place.
Signed-off-by: Pranith Kumar <bobby.prani@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
authored by
Pranith Kumar
and committed by
Paul E. McKenney
28f6569a
21871d7e
+74
-80
+2
-2
Documentation/RCU/rcu.txt
+2
-2
Documentation/RCU/rcu.txt
···
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executed in user mode, or executed in the idle loop, we can
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safely free up that item.
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-
Preemptible variants of RCU (CONFIG_TREE_PREEMPT_RCU) get the
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+
Preemptible variants of RCU (CONFIG_PREEMPT_RCU) get the
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same effect, but require that the readers manipulate CPU-local
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counters. These counters allow limited types of blocking within
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RCU read-side critical sections. SRCU also uses CPU-local
···
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o I hear that RCU needs work in order to support realtime kernels?
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This work is largely completed. Realtime-friendly RCU can be
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-
enabled via the CONFIG_TREE_PREEMPT_RCU kernel configuration
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enabled via the CONFIG_PREEMPT_RCU kernel configuration
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parameter. However, work is in progress for enabling priority
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boosting of preempted RCU read-side critical sections. This is
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needed if you have CPU-bound realtime threads.
+4
-4
Documentation/RCU/stallwarn.txt
+4
-4
Documentation/RCU/stallwarn.txt
···
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and that the stall was affecting RCU-sched. This message will normally be
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followed by a stack dump of the offending CPU. On TREE_RCU kernel builds,
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RCU and RCU-sched are implemented by the same underlying mechanism,
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-
while on TREE_PREEMPT_RCU kernel builds, RCU is instead implemented
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while on PREEMPT_RCU kernel builds, RCU is instead implemented
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by rcu_preempt_state.
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On the other hand, if the offending CPU fails to print out a stall-warning
···
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This message indicates that CPU 2 detected that CPUs 3 and 5 were both
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causing stalls, and that the stall was affecting RCU-bh. This message
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will normally be followed by stack dumps for each CPU. Please note that
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TREE_PREEMPT_RCU builds can be stalled by tasks as well as by CPUs,
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PREEMPT_RCU builds can be stalled by tasks as well as by CPUs,
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and that the tasks will be indicated by PID, for example, "P3421".
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It is even possible for a rcu_preempt_state stall to be caused by both
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CPUs -and- tasks, in which case the offending CPUs and tasks will all
···
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o A CPU-bound real-time task in a CONFIG_PREEMPT_RT kernel that
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is running at a higher priority than the RCU softirq threads.
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This will prevent RCU callbacks from ever being invoked,
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-
and in a CONFIG_TREE_PREEMPT_RCU kernel will further prevent
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+
and in a CONFIG_PREEMPT_RCU kernel will further prevent
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RCU grace periods from ever completing. Either way, the
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system will eventually run out of memory and hang. In the
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-
CONFIG_TREE_PREEMPT_RCU case, you might see stall-warning
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+
CONFIG_PREEMPT_RCU case, you might see stall-warning
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messages.
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o A hardware or software issue shuts off the scheduler-clock
+2
-2
Documentation/RCU/trace.txt
+2
-2
Documentation/RCU/trace.txt
···
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for rcutree and next for rcutiny.
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-
CONFIG_TREE_RCU and CONFIG_TREE_PREEMPT_RCU debugfs Files and Formats
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+
CONFIG_TREE_RCU and CONFIG_PREEMPT_RCU debugfs Files and Formats
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These implementations of RCU provide several debugfs directories under the
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top-level directory "rcu":
···
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rcu/rcu_sched
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Each directory contains files for the corresponding flavor of RCU.
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-
Note that rcu/rcu_preempt is only present for CONFIG_TREE_PREEMPT_RCU.
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+
Note that rcu/rcu_preempt is only present for CONFIG_PREEMPT_RCU.
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For CONFIG_TREE_RCU, the RCU flavor maps onto the RCU-sched flavor,
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so that activity for both appears in rcu/rcu_sched.
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+1
-1
Documentation/RCU/whatisRCU.txt
+1
-1
Documentation/RCU/whatisRCU.txt
···
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Used by a reader to inform the reclaimer that the reader is
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entering an RCU read-side critical section. It is illegal
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to block while in an RCU read-side critical section, though
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-
kernels built with CONFIG_TREE_PREEMPT_RCU can preempt RCU
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+
kernels built with CONFIG_PREEMPT_RCU can preempt RCU
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read-side critical sections. Any RCU-protected data structure
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accessed during an RCU read-side critical section is guaranteed to
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remain unreclaimed for the full duration of that critical section.
+1
-1
include/linux/init_task.h
+1
-1
include/linux/init_task.h
+3
-3
include/linux/rcupdate.h
+3
-3
include/linux/rcupdate.h
···
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INVALID_RCU_FLAVOR
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};
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-
#if defined(CONFIG_TREE_RCU) || defined(CONFIG_TREE_PREEMPT_RCU)
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+
#if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
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void rcutorture_get_gp_data(enum rcutorture_type test_type, int *flags,
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unsigned long *gpnum, unsigned long *completed);
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void rcutorture_record_test_transition(void);
···
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void (*func)(struct rcu_head *head));
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void wait_rcu_gp(call_rcu_func_t crf);
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-
#if defined(CONFIG_TREE_RCU) || defined(CONFIG_TREE_PREEMPT_RCU)
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+
#if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
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#include <linux/rcutree.h>
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#elif defined(CONFIG_TINY_RCU)
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#include <linux/rcutiny.h>
···
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*
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* In non-preemptible RCU implementations (TREE_RCU and TINY_RCU),
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* it is illegal to block while in an RCU read-side critical section.
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-
* In preemptible RCU implementations (TREE_PREEMPT_RCU) in CONFIG_PREEMPT
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+
* In preemptible RCU implementations (PREEMPT_RCU) in CONFIG_PREEMPT
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* kernel builds, RCU read-side critical sections may be preempted,
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* but explicit blocking is illegal. Finally, in preemptible RCU
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* implementations in real-time (with -rt patchset) kernel builds, RCU
+2
-2
include/linux/sched.h
+2
-2
include/linux/sched.h
···
1278
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union rcu_special rcu_read_unlock_special;
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struct list_head rcu_node_entry;
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#endif /* #ifdef CONFIG_PREEMPT_RCU */
1281
-
#ifdef CONFIG_TREE_PREEMPT_RCU
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+
#ifdef CONFIG_PREEMPT_RCU
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struct rcu_node *rcu_blocked_node;
1283
-
#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
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+
#endif /* #ifdef CONFIG_PREEMPT_RCU */
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#ifdef CONFIG_TASKS_RCU
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unsigned long rcu_tasks_nvcsw;
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bool rcu_tasks_holdout;
+2
-2
include/trace/events/rcu.h
+2
-2
include/trace/events/rcu.h
···
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#ifdef CONFIG_RCU_TRACE
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-
#if defined(CONFIG_TREE_RCU) || defined(CONFIG_TREE_PREEMPT_RCU)
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+
#if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
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/*
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* Tracepoint for grace-period events. Takes a string identifying the
···
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__entry->cpu, __entry->qsevent)
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);
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-
#endif /* #if defined(CONFIG_TREE_RCU) || defined(CONFIG_TREE_PREEMPT_RCU) */
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+
#endif /* #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU) */
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/*
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* Tracepoint for dyntick-idle entry/exit events. These take a string
+8
-14
init/Kconfig
+8
-14
init/Kconfig
···
477
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thousands of CPUs. It also scales down nicely to
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smaller systems.
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-
config TREE_PREEMPT_RCU
480
+
config PREEMPT_RCU
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bool "Preemptible tree-based hierarchical RCU"
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depends on PREEMPT
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select IRQ_WORK
···
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501
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endchoice
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-
config PREEMPT_RCU
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-
def_bool TREE_PREEMPT_RCU
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-
help
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-
This option enables preemptible-RCU code that is common between
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-
TREE_PREEMPT_RCU and, in the old days, TINY_PREEMPT_RCU.
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-
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config TASKS_RCU
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bool "Task_based RCU implementation using voluntary context switch"
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default n
···
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If unsure, say N.
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config RCU_STALL_COMMON
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-
def_bool ( TREE_RCU || TREE_PREEMPT_RCU || RCU_TRACE )
521
+
def_bool ( TREE_RCU || PREEMPT_RCU || RCU_TRACE )
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help
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This option enables RCU CPU stall code that is common between
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the TINY and TREE variants of RCU. The purpose is to allow
···
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int "Tree-based hierarchical RCU fanout value"
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range 2 64 if 64BIT
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range 2 32 if !64BIT
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-
depends on TREE_RCU || TREE_PREEMPT_RCU
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depends on TREE_RCU || PREEMPT_RCU
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default 64 if 64BIT
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default 32 if !64BIT
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help
···
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int "Tree-based hierarchical RCU leaf-level fanout value"
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range 2 RCU_FANOUT if 64BIT
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range 2 RCU_FANOUT if !64BIT
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-
depends on TREE_RCU || TREE_PREEMPT_RCU
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+
depends on TREE_RCU || PREEMPT_RCU
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default 16
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help
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This option controls the leaf-level fanout of hierarchical
···
615
621
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config RCU_FANOUT_EXACT
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bool "Disable tree-based hierarchical RCU auto-balancing"
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-
depends on TREE_RCU || TREE_PREEMPT_RCU
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+
depends on TREE_RCU || PREEMPT_RCU
619
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default n
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help
621
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This option forces use of the exact RCU_FANOUT value specified,
···
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Say N if you are unsure.
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config TREE_RCU_TRACE
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-
def_bool RCU_TRACE && ( TREE_RCU || TREE_PREEMPT_RCU )
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+
def_bool RCU_TRACE && ( TREE_RCU || PREEMPT_RCU )
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select DEBUG_FS
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help
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This option provides tracing for the TREE_RCU and
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-
TREE_PREEMPT_RCU implementations, permitting Makefile to
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+
PREEMPT_RCU implementations, permitting Makefile to
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trivially select kernel/rcutree_trace.c.
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config RCU_BOOST
···
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config RCU_NOCB_CPU
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bool "Offload RCU callback processing from boot-selected CPUs"
713
-
depends on TREE_RCU || TREE_PREEMPT_RCU
719
+
depends on TREE_RCU || PREEMPT_RCU
714
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default n
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721
help
716
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Use this option to reduce OS jitter for aggressive HPC or
+1
-1
kernel/rcu/Makefile
+1
-1
kernel/rcu/Makefile
+5
-5
kernel/rcu/tree.h
+5
-5
kernel/rcu/tree.h
···
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unsigned long expmask; /* Groups that have ->blkd_tasks */
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/* elements that need to drain to allow the */
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/* current expedited grace period to */
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/* complete (only for TREE_PREEMPT_RCU). */
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/* complete (only for PREEMPT_RCU). */
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unsigned long qsmaskinit;
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/* Per-GP initial value for qsmask & expmask. */
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unsigned long grpmask; /* Mask to apply to parent qsmask. */
···
530
530
extern struct rcu_state rcu_bh_state;
531
531
DECLARE_PER_CPU(struct rcu_data, rcu_bh_data);
532
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-
#ifdef CONFIG_TREE_PREEMPT_RCU
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+
#ifdef CONFIG_PREEMPT_RCU
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extern struct rcu_state rcu_preempt_state;
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DECLARE_PER_CPU(struct rcu_data, rcu_preempt_data);
536
-
#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
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+
#endif /* #ifdef CONFIG_PREEMPT_RCU */
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#ifdef CONFIG_RCU_BOOST
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DECLARE_PER_CPU(unsigned int, rcu_cpu_kthread_status);
···
563
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#endif /* #ifdef CONFIG_HOTPLUG_CPU */
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static void rcu_preempt_check_callbacks(int cpu);
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void call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *rcu));
566
-
#if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_TREE_PREEMPT_RCU)
566
+
#if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_PREEMPT_RCU)
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static void rcu_report_exp_rnp(struct rcu_state *rsp, struct rcu_node *rnp,
568
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bool wake);
569
-
#endif /* #if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_TREE_PREEMPT_RCU) */
569
+
#endif /* #if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_PREEMPT_RCU) */
570
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static void __init __rcu_init_preempt(void);
571
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static void rcu_initiate_boost(struct rcu_node *rnp, unsigned long flags);
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static void rcu_preempt_boost_start_gp(struct rcu_node *rnp);
+3
-3
kernel/rcu/tree_plugin.h
+3
-3
kernel/rcu/tree_plugin.h
···
100
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#endif
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}
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-
#ifdef CONFIG_TREE_PREEMPT_RCU
103
+
#ifdef CONFIG_PREEMPT_RCU
104
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RCU_STATE_INITIALIZER(rcu_preempt, 'p', call_rcu);
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static struct rcu_state *rcu_state_p = &rcu_preempt_state;
···
932
932
__rcu_read_unlock();
933
933
}
934
934
935
-
#else /* #ifdef CONFIG_TREE_PREEMPT_RCU */
935
+
#else /* #ifdef CONFIG_PREEMPT_RCU */
936
936
937
937
static struct rcu_state *rcu_state_p = &rcu_sched_state;
938
938
···
1083
1083
{
1084
1084
}
1085
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-
#endif /* #else #ifdef CONFIG_TREE_PREEMPT_RCU */
1086
+
#endif /* #else #ifdef CONFIG_PREEMPT_RCU */
1087
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1088
1088
#ifdef CONFIG_RCU_BOOST
1089
1089
+1
-1
kernel/rcu/update.c
+1
-1
kernel/rcu/update.c
···
306
306
EXPORT_SYMBOL_GPL(rcuhead_debug_descr);
307
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#endif /* #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */
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-
#if defined(CONFIG_TREE_RCU) || defined(CONFIG_TREE_PREEMPT_RCU) || defined(CONFIG_RCU_TRACE)
309
+
#if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU) || defined(CONFIG_RCU_TRACE)
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void do_trace_rcu_torture_read(const char *rcutorturename, struct rcu_head *rhp,
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unsigned long secs,
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unsigned long c_old, unsigned long c)
+1
-1
lib/Kconfig.debug
+1
-1
lib/Kconfig.debug
···
1252
1252
1253
1253
config RCU_CPU_STALL_INFO
1254
1254
bool "Print additional diagnostics on RCU CPU stall"
1255
-
depends on (TREE_RCU || TREE_PREEMPT_RCU) && DEBUG_KERNEL
1255
+
depends on (TREE_RCU || PREEMPT_RCU) && DEBUG_KERNEL
1256
1256
default n
1257
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help
1258
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For each stalled CPU that is aware of the current RCU grace
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/TREE01
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/TREE01
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/TREE02
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/TREE02
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/TREE02-T
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/TREE02-T
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/TREE03
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/TREE03
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/TREE08
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/TREE08
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/TREE08-T
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/TREE08-T
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/TREE09
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/TREE09
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v0.0/P1-S-T-NH-SD-SMP-HP
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v0.0/P1-S-T-NH-SD-SMP-HP
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v0.0/P2-2-t-nh-sd-SMP-hp
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v0.0/P2-2-t-nh-sd-SMP-hp
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v0.0/P3-3-T-nh-SD-SMP-hp
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v0.0/P3-3-T-nh-SD-SMP-hp
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v0.0/P4-A-t-NH-sd-SMP-HP
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v0.0/P4-A-t-NH-sd-SMP-HP
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v0.0/P5-U-T-NH-sd-SMP-hp
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v0.0/P5-U-T-NH-sd-SMP-hp
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.12/P1-S-T-NH-SD-SMP-HP
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.12/P1-S-T-NH-SD-SMP-HP
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.12/P2-2-t-nh-sd-SMP-hp
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.12/P2-2-t-nh-sd-SMP-hp
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.12/P3-3-T-nh-SD-SMP-hp
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.12/P3-3-T-nh-SD-SMP-hp
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.12/P4-A-t-NH-sd-SMP-HP
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.12/P4-A-t-NH-sd-SMP-HP
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.12/P5-U-T-NH-sd-SMP-hp
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.12/P5-U-T-NH-sd-SMP-hp
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.12/P6---t-nh-SD-smp-hp
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.12/P6---t-nh-SD-smp-hp
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.12/P7-4-T-NH-SD-SMP-HP
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.12/P7-4-T-NH-SD-SMP-HP
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.12/P7-4-T-NH-SD-SMP-HP-all
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.12/P7-4-T-NH-SD-SMP-HP-all
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.12/P7-4-T-NH-SD-SMP-HP-none
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.12/P7-4-T-NH-SD-SMP-HP-none
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.12/P7-4-T-NH-SD-SMP-hp
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.12/P7-4-T-NH-SD-SMP-hp
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.3/P1-S-T-NH-SD-SMP-HP
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.3/P1-S-T-NH-SD-SMP-HP
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.3/P2-2-t-nh-sd-SMP-hp
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.3/P2-2-t-nh-sd-SMP-hp
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.3/P3-3-T-nh-SD-SMP-hp
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.3/P3-3-T-nh-SD-SMP-hp
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.3/P4-A-t-NH-sd-SMP-HP
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.3/P4-A-t-NH-sd-SMP-HP
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.3/P5-U-T-NH-sd-SMP-hp
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.3/P5-U-T-NH-sd-SMP-hp
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.5/P1-S-T-NH-SD-SMP-HP
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.5/P1-S-T-NH-SD-SMP-HP
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.5/P2-2-t-nh-sd-SMP-hp
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.5/P2-2-t-nh-sd-SMP-hp
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.5/P3-3-T-nh-SD-SMP-hp
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.5/P3-3-T-nh-SD-SMP-hp
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.5/P4-A-t-NH-sd-SMP-HP
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.5/P4-A-t-NH-sd-SMP-HP
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.5/P5-U-T-NH-sd-SMP-hp
+1
-1
tools/testing/selftests/rcutorture/configs/rcu/v3.5/P5-U-T-NH-sd-SMP-hp
+1
-1
tools/testing/selftests/rcutorture/doc/TINY_RCU.txt
+1
-1
tools/testing/selftests/rcutorture/doc/TINY_RCU.txt
+5
-5
tools/testing/selftests/rcutorture/doc/TREE_RCU-kconfig.txt
+5
-5
tools/testing/selftests/rcutorture/doc/TREE_RCU-kconfig.txt
···
1
1
This document gives a brief rationale for the TREE_RCU-related test
2
-
cases, a group that includes TREE_PREEMPT_RCU.
2
+
cases, a group that includes PREEMPT_RCU.
3
3
4
4
5
5
Kconfig Parameters:
···
14
14
CONFIG_PREEMPT -- Do half. (First three and #8.)
15
15
CONFIG_PROVE_LOCKING -- Do all but two, covering CONFIG_PROVE_RCU and not.
16
16
CONFIG_PROVE_RCU -- Do all but one under CONFIG_PROVE_LOCKING.
17
-
CONFIG_RCU_BOOST -- one of TREE_PREEMPT_RCU.
17
+
CONFIG_RCU_BOOST -- one of PREEMPT_RCU.
18
18
CONFIG_RCU_KTHREAD_PRIO -- set to 2 for _BOOST testing.
19
19
CONFIG_RCU_CPU_STALL_INFO -- Do one.
20
20
CONFIG_RCU_CPU_STALL_VERBOSE -- do one with and without _INFO.
···
27
27
CONFIG_RCU_NOCB_CPU_NONE -- Do one.
28
28
CONFIG_RCU_NOCB_CPU_ZERO -- Do one.
29
29
CONFIG_RCU_TRACE -- Do half.
30
-
CONFIG_SMP -- Need one !SMP for TREE_PREEMPT_RCU.
30
+
CONFIG_SMP -- Need one !SMP for PREEMPT_RCU.
31
31
RCU-bh: Do one with PREEMPT and one with !PREEMPT.
32
32
RCU-sched: Do one with PREEMPT but not BOOST.
33
33
···
77
77
78
78
CONFIG_RCU_STALL_COMMON
79
79
80
-
Implied by TREE_RCU and TREE_PREEMPT_RCU.
80
+
Implied by TREE_RCU and PREEMPT_RCU.
81
81
82
82
CONFIG_RCU_TORTURE_TEST
83
83
CONFIG_RCU_TORTURE_TEST_RUNNABLE
···
88
88
89
89
Redundant with CONFIG_NO_HZ_FULL.
90
90
91
-
CONFIG_TREE_PREEMPT_RCU
91
+
CONFIG_PREEMPT_RCU
92
92
CONFIG_TREE_RCU
93
93
94
94
These are controlled by CONFIG_PREEMPT.