linux-kernel - Re: [PATCH] ftrace/samples: Add missing prototype for my_direct

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Date:   Mon, 1 Nov 2021 16:39:10 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Ingo Molnar <mingo@...hat.com>, kernel test robot <lkp@...el.com>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ftrace/samples: Add missing prototype for my_direct_func

On Mon, Nov 01, 2021 at 11:31:27AM -0400, Steven Rostedt wrote:
> On Mon,  1 Nov 2021 16:20:02 +0100
> Jiri Olsa <jolsa@...hat.com> wrote:
> 
> > There's compilation fail reported kernel test robot for W=1 build:
> > 
> >   >> samples/ftrace/ftrace-direct-multi.c:8:6: warning: no previous  
> >   prototype for function 'my_direct_func' [-Wmissing-prototypes]
> >      void my_direct_func(unsigned long ip)
> > 
> > The inlined assembly is used outside function, so we can't make
> > my_direct_func static and pass it as asm input argument.
> > 
> > However my_tramp is already extern so I think there's no problem
> > keeping my_direct_func extern as well and just add its prototype.
> > 
> > Reported-by: kernel test robot <lkp@...el.com>
> > Fixes: 5fae941b9a6f ("ftrace/samples: Add multi direct interface test module")
> > Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> > ---
> >  samples/ftrace/ftrace-direct-multi.c | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/samples/ftrace/ftrace-direct-multi.c b/samples/ftrace/ftrace-direct-multi.c
> > index 2a5b1fb7ac14..e0ccf43da0c9 100644
> > --- a/samples/ftrace/ftrace-direct-multi.c
> > +++ b/samples/ftrace/ftrace-direct-multi.c
> > @@ -10,6 +10,7 @@ void my_direct_func(unsigned long ip)
> >  	trace_printk("ip %lx\n", ip);
> >  }
> >  
> > +extern void my_direct_func(unsigned long ip);
> >  extern void my_tramp(void *);
> 
> Except that I believe that the prototype must come before it is used.
> 
> I don't think this will fix the warning.

ugh, sry.. v2 posted

jirka

> 
> -- Steve
> 
> 
> >  
> >  asm (
>