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

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

Hardware

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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