summaryrefslogtreecommitdiff
path: root/arch/Kconfig
diff options
context:
space:
mode:
authorPaul E. McKenney <paulmck@kernel.org>2022-03-17 21:05:09 +0300
committerPaul E. McKenney <paulmck@kernel.org>2022-04-21 02:52:58 +0300
commit835f14ed53076384f0e1dad2fddb4881315f124f (patch)
tree3bea30a7de871d8b9979c2c90ff6b587dc613a47 /arch/Kconfig
parent46e861be589881e0905b9ade3d8439883858721c (diff)
downloadlinux-835f14ed53076384f0e1dad2fddb4881315f124f.tar.xz
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 'arch/Kconfig')
-rw-r--r--arch/Kconfig1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/Kconfig b/arch/Kconfig
index 29b0167c088b..1bf29ce754af 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -35,6 +35,7 @@ config KPROBES
depends on MODULES
depends on HAVE_KPROBES
select KALLSYMS
+ select TASKS_RCU if PREEMPTION
help
Kprobes allows you to trap at almost any kernel address and
execute a callback function. register_kprobe() establishes