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| author | Masami Hiramatsu <mhiramat@kernel.org> | 2022-03-15 23:01:48 +0900 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2022-03-17 20:16:52 -0700 |
| commit | 5b0ab78998e32564a011b14c4c7f9c81e2d42b9d (patch) | |
| tree | 96ec6ca183dafa1165d4d17392f2d9b1ba9cda10 /kernel/trace/Kconfig | |
| parent | 515a49173b80a4aabcbad9a4fa2a247042378ea1 (diff) | |
| download | linux-stable-5b0ab78998e32564a011b14c4c7f9c81e2d42b9d.tar.gz linux-stable-5b0ab78998e32564a011b14c4c7f9c81e2d42b9d.tar.bz2 linux-stable-5b0ab78998e32564a011b14c4c7f9c81e2d42b9d.zip | |
fprobe: Add exit_handler support
Add exit_handler to fprobe. fprobe + rethook allows us to hook the kernel
function return. The rethook will be enabled only if the
fprobe::exit_handler is set.
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Tested-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/164735290790.1084943.10601965782208052202.stgit@devnote2
Diffstat (limited to 'kernel/trace/Kconfig')
| -rw-r--r-- | kernel/trace/Kconfig | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig index e75504e42ab8..99dd4ca63d68 100644 --- a/kernel/trace/Kconfig +++ b/kernel/trace/Kconfig @@ -251,11 +251,14 @@ config FPROBE bool "Kernel Function Probe (fprobe)" depends on FUNCTION_TRACER depends on DYNAMIC_FTRACE_WITH_REGS + depends on HAVE_RETHOOK + select RETHOOK default n help - This option enables kernel function probe (fprobe) based on ftrace, - which is similar to kprobes, but probes only for kernel function - entries and it can probe multiple functions by one fprobe. + This option enables kernel function probe (fprobe) based on ftrace. + The fprobe is similar to kprobes, but probes only for kernel function + entries and exits. This also can probe multiple functions by one + fprobe. If unsure, say N. |