linux-kernel - Re: [External] linux-next: build warning after merge of the ftrace tree

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Date:   Wed, 5 Aug 2020 12:53:39 +0800
From:   Muchun Song <songmuchun@...edance.com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Chengming Zhou <zhouchengming@...edance.com>,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [External] linux-next: build warning after merge of the ftrace tree

On Wed, Aug 5, 2020 at 12:21 PM Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>
> Hi all,
>
> After merging the ftrace tree, today's linux-next build (powerpc
> ppc64_defconfig) produced this warning:
>
> 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);
>       |   ^~~~~~~~~~~~~~~~~~~~
>

Sorry, maybe we should rework the macro of disarm_kprobe_ftrace to an
inline function like below.

-#define disarm_kprobe_ftrace(p)        (-ENODEV)
+static inline int disarm_kprobe_ftrace(struct kprobe *p)
+{
+       return -ENODEV
+}
 #endif

> Introduced by commit
>
>   0cb2f1372baa ("kprobes: Fix NULL pointer dereference at kprobe_ftrace_handler")
>
> --
> Cheers,
> Stephen Rothwell



-- 
Yours,
Muchun