From: Muchun Song <songmuchun@xxxxxxxxxxxxx>
commit 10de795a5addd1962406796a6e13ba6cc0fc6bee upstream.
Fix compiler warning(as show below) for !CONFIG_KPROBES_ON_FTRACE.
kernel/kprobes.c: In function 'kill_kprobe':
kernel/kprobes.c:1116:33: warning: statement with no effect
[-Wunused-value]
1116 | #define disarm_kprobe_ftrace(p) (-ENODEV)
| ^
kernel/kprobes.c:2154:3: note: in expansion of macro
'disarm_kprobe_ftrace'
2154 | disarm_kprobe_ftrace(p);
Link: https://lore.kernel.org/r/20200805142136.0331f7ea@xxxxxxxxxxxxxxxx
Link: https://lkml.kernel.org/r/20200805172046.19066-1-songmuchun@xxxxxxxxxxxxx
Reported-by: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
Fixes: 0cb2f1372baa ("kprobes: Fix NULL pointer dereference at kprobe_ftrace_handler")
Acked-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Acked-by: John Fastabend <john.fastabend@xxxxxxxxx>
Signed-off-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Signed-off-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/kprobes.c | 17 ++++++++++++++---
1 file changed, 14 insertions(+), 3 deletions(-)
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -1065,9 +1065,20 @@ static int disarm_kprobe_ftrace(struct k
return ret;
}
#else /* !CONFIG_KPROBES_ON_FTRACE */
-#define prepare_kprobe(p) arch_prepare_kprobe(p)
-#define arm_kprobe_ftrace(p) (-ENODEV)
-#define disarm_kprobe_ftrace(p) (-ENODEV)
+static inline int prepare_kprobe(struct kprobe *p)
+{
+ return arch_prepare_kprobe(p);
+}
+
+static inline int arm_kprobe_ftrace(struct kprobe *p)
+{
+ return -ENODEV;
+}
+
+static inline int disarm_kprobe_ftrace(struct kprobe *p)
+{
+ return -ENODEV;
+}
#endif
/* Arm a kprobe with text_mutex */
