linux-kernel - Re: [PATCH -tip 6/6] kprobes: Use bool type for functions which returns boolean value

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Date:   Sun, 11 Jul 2021 10:26:27 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Joe Perches <joe@...ches.com>
Cc:     X86 ML <x86@...nel.org>, Ingo Molnar <mingo@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Daniel Xu <dxu@...uu.xyz>, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org, kuba@...nel.org, mingo@...hat.com,
        ast@...nel.org, Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <peterz@...radead.org>, kernel-team@...com,
        yhs@...com, linux-ia64@...r.kernel.org,
        Abhishek Sagar <sagar.abhishek@...il.com>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>
Subject: Re: [PATCH -tip 6/6] kprobes: Use bool type for functions which
 returns boolean value

On Sat, 10 Jul 2021 09:27:22 -0700
Joe Perches <joe@...ches.com> wrote:

> On Sat, 2021-07-10 at 23:56 +0900, Masami Hiramatsu wrote:
> > Use the 'bool' type instead of 'int' for the functions which
> > returns a boolean value, because this makes clear that those
> > functions don't return any error code.
> []
> > diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h
> []
> > @@ -104,25 +104,25 @@ struct kprobe {
> >  #define KPROBE_FLAG_FTRACE	8 /* probe is using ftrace */
> >  
> > 
> >  /* Has this kprobe gone ? */
> > -static inline int kprobe_gone(struct kprobe *p)
> > +static inline bool kprobe_gone(struct kprobe *p)
> >  {
> >  	return p->flags & KPROBE_FLAG_GONE;
> >  }
> 
> This change would also allow the removal of the !! from:
> 
> kernel/trace/trace_kprobe.c:104:        return !!(kprobe_gone(&tk->rp.kp));

Good catch! OK, I'll update 

Thank you,

> ---
>  kernel/trace/trace_kprobe.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
> index ea6178cb5e334..c6e0345a44e94 100644
> --- a/kernel/trace/trace_kprobe.c
> +++ b/kernel/trace/trace_kprobe.c
> @@ -101,7 +101,7 @@ static nokprobe_inline unsigned long trace_kprobe_offset(struct trace_kprobe *tk
>  
>  static nokprobe_inline bool trace_kprobe_has_gone(struct trace_kprobe *tk)
>  {
> -	return !!(kprobe_gone(&tk->rp.kp));
> +	return kprobe_gone(&tk->rp.kp);
>  }
>  
>  static nokprobe_inline bool trace_kprobe_within_module(struct trace_kprobe *tk,
> 
> 


-- 
Masami Hiramatsu <mhiramat@...nel.org>