linux-kernel - [PATCH] bpf: fix BPF_KPROBE

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Date:   Tue, 19 Dec 2017 11:12:04 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>
Cc:     Arnd Bergmann <arnd@...db.de>, Alexei Starovoitov <ast@...nel.org>,
        Josef Bacik <jbacik@...com>, linux-kernel@...r.kernel.org
Subject: [PATCH] bpf: fix BPF_KPROBE_OVERRIDE dependencies

CONFIG_BPF_KPROBE_OVERRIDE causes a link failure when CONFIG_KPROBE_EVENTS
is disabled:

kernel/trace/bpf_trace.o: In function `bpf_override_return':
(.text+0x172): undefined reference to `bpf_kprobe_override'

This adds it to the list of dependencies.

Fixes: 9802d86585db ("bpf: add a bpf_override_function helper")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 kernel/trace/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index ace4547b7564..0d83668652ef 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -534,6 +534,7 @@ config FUNCTION_PROFILER
 config BPF_KPROBE_OVERRIDE
 	bool "Enable BPF programs to override a kprobed function"
 	depends on BPF_EVENTS
+	depends on KPROBE_EVENTS
 	depends on KPROBES_ON_FTRACE
 	depends on HAVE_KPROBE_OVERRIDE
 	depends on DYNAMIC_FTRACE_WITH_REGS
-- 
2.9.0