On Thu, 6 Aug 2020 01:20:46 +0800 Muchun Song <songmuchun@xxxxxxxxxxxxx> wrote: > 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 > > Reported-by: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> > Fixes: 0cb2f1372baa ("kprobes: Fix NULL pointer dereference at kprobe_ftrace_handler") > Signed-off-by: Muchun Song <songmuchun@xxxxxxxxxxxxx> Looks good to me. Acked-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx> Thank you! > --- > kernel/kprobes.c | 17 ++++++++++++++--- > 1 file changed, 14 insertions(+), 3 deletions(-) > > diff --git a/kernel/kprobes.c b/kernel/kprobes.c > index 503add629599..d36e2b017588 100644 > --- a/kernel/kprobes.c > +++ b/kernel/kprobes.c > @@ -1114,9 +1114,20 @@ static int disarm_kprobe_ftrace(struct kprobe *p) > ipmodify ? &kprobe_ipmodify_enabled : &kprobe_ftrace_enabled); > } > #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 */ > -- > 2.11.0 > -- Masami Hiramatsu <mhiramat@xxxxxxxxxx>
