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| author |   Paul E. McKenney <paulmck@kernel.org> | 2022-03-17 11:05:09 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2022-04-20 16:52:58 -0700 |
| commit | 835f14ed53076384f0e1dad2fddb4881315f124f (patch) | |
| tree | 3bea30a7de871d8b9979c2c90ff6b587dc613a47 /kernel | |
| parent | rcu: Make TASKS_RUDE_RCU select IRQ_WORK (diff) | |
| download | linux-dev-835f14ed53076384f0e1dad2fddb4881315f124f.tar.xz linux-dev-835f14ed53076384f0e1dad2fddb4881315f124f.zip | |
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>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/bpf/Kconfig | 1 | ||||
| -rw-r--r-- | kernel/rcu/Kconfig | 3 | ||||
| -rw-r--r-- | kernel/trace/Kconfig | 1 |
3 files changed, 4 insertions, 1 deletions
diff --git a/kernel/bpf/Kconfig b/kernel/bpf/Kconfig index d56ee177d5f8..2dfe1079f772 100644 --- a/kernel/bpf/Kconfig +++ b/kernel/bpf/Kconfig @@ -27,6 +27,7 @@ config BPF_SYSCALL bool "Enable bpf() system call" select BPF select IRQ_WORK + select TASKS_RCU if PREEMPTION select TASKS_TRACE_RCU select BINARY_PRINTF select NET_SOCK_MSG if NET diff --git a/kernel/rcu/Kconfig b/kernel/rcu/Kconfig index f559870fbf8b..4f665ae0cf55 100644 --- a/kernel/rcu/Kconfig +++ b/kernel/rcu/Kconfig @@ -78,7 +78,8 @@ config TASKS_RCU_GENERIC task-based RCU implementations. Not for manual selection. config TASKS_RCU - def_bool PREEMPTION + def_bool 0 + select IRQ_WORK help This option enables a task-based RCU implementation that uses only voluntary context switch (not preemption!), idle, and diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig index 2c43e327a619..bf5da6c4e999 100644 --- a/kernel/trace/Kconfig +++ b/kernel/trace/Kconfig @@ -144,6 +144,7 @@ config TRACING select BINARY_PRINTF select EVENT_TRACING select TRACE_CLOCK + select TASKS_RCU if PREEMPTION config GENERIC_TRACER bool |