CONFIG_FTRACE_VALIDATE_RCU_IS_WATCHING: Validate RCU is on during ftrace execution

General informations

The Linux kernel configuration item CONFIG_FTRACE_VALIDATE_RCU_IS_WATCHING:

• prompt: Validate RCU is on during ftrace execution
• type: bool
• depends on: ( CONFIG_FUNCTION_TRACER ) && ( CONFIG_ARCH_WANTS_NO_INSTR )
• defined in kernel/trace/Kconfig
• found in Linux kernels: 6.10–6.12, 6.13-rc+HEAD

Help text

All callbacks that attach to the function tracing have some sort of protection against recursion. This option is only to verify that ftrace (and other users of ftrace_test_recursion_trylock()) are not called outside of RCU, as if they are, it can cause a race. But it also has a noticeable overhead when enabled.

If unsure, say N

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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