rcu: Make the TASKS_RCU Kconfig option be selected
Currently, any kernel built with CONFIG_PREEMPTION=y also gets CONFIG_TASKS_RCU=y, which is not helpful to people trying to build preemptible kernels of minimal size. Because CONFIG_TASKS_RCU=y is needed only in kernels doing tracing of one form or another, this commit moves from TASKS_RCU deciding when it should be enabled to the tracing Kconfig options explicitly selecting it. This allows building preemptible kernels without TASKS_RCU, if desired. This commit also updates the SRCU-N and TREE09 rcutorture scenarios in order to avoid Kconfig errors that would otherwise result from CONFIG_TASKS_RCU being selected without its CONFIG_RCU_EXPERT dependency being met. [ paulmck: Apply BPF_SYSCALL feedback from Andrii Nakryiko. ] Reported-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Tested-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Tested-by: Zhouyi Zhou <zhouzhouyi@gmail.com> Cc: Andrii Nakryiko <andrii@kernel.org> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Acked-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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@ -35,6 +35,7 @@ config KPROBES
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depends on MODULES
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depends on HAVE_KPROBES
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select KALLSYMS
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select TASKS_RCU if PREEMPTION
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help
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Kprobes allows you to trap at almost any kernel address and
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execute a callback function. register_kprobe() establishes
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@ -27,6 +27,7 @@ config BPF_SYSCALL
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bool "Enable bpf() system call"
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select BPF
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select IRQ_WORK
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select TASKS_RCU if PREEMPTION
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select TASKS_TRACE_RCU
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select BINARY_PRINTF
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select NET_SOCK_MSG if NET
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@ -78,7 +78,8 @@ config TASKS_RCU_GENERIC
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task-based RCU implementations. Not for manual selection.
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config TASKS_RCU
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def_bool PREEMPTION
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def_bool 0
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select IRQ_WORK
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help
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This option enables a task-based RCU implementation that uses
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only voluntary context switch (not preemption!), idle, and
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@ -144,6 +144,7 @@ config TRACING
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select BINARY_PRINTF
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select EVENT_TRACING
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select TRACE_CLOCK
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select TASKS_RCU if PREEMPTION
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config GENERIC_TRACER
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bool
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@ -6,3 +6,5 @@ CONFIG_PREEMPT_NONE=y
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CONFIG_PREEMPT_VOLUNTARY=n
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CONFIG_PREEMPT=n
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#CHECK#CONFIG_RCU_EXPERT=n
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CONFIG_KPROBES=n
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CONFIG_FTRACE=n
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@ -13,3 +13,5 @@ CONFIG_DEBUG_LOCK_ALLOC=n
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CONFIG_RCU_BOOST=n
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CONFIG_DEBUG_OBJECTS_RCU_HEAD=n
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#CHECK#CONFIG_RCU_EXPERT=n
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CONFIG_KPROBES=n
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CONFIG_FTRACE=n
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