linux-kernel - Re: [PATCH -tip] x86: ftrace.c declare prepare_ftrace

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Date:	Fri, 10 Apr 2009 09:59:55 +0530
From:	Jaswinder Singh Rajput <jaswinder@...nel.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>, x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>, josh@...edesktop.org
Subject: Re: [PATCH -tip] x86: ftrace.c declare prepare_ftrace_return
 before they get used

On Thu, 2009-04-09 at 14:55 -0400, Steven Rostedt wrote:
> 
> On Thu, 9 Apr 2009, Jaswinder Singh Rajput wrote:
> 
> > 
> > Subject: [PATCH] x86: ftrace.c declare prepare_ftrace_return before they get used
> > 
> > Impact: fix sparse warning:
> >   arch/x86/kernel/ftrace.c:411:6: warning: symbol 'prepare_ftrace_return' was not declared. Should it be static?
> > 
> > Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@...il.com>
> > ---
> >  arch/x86/include/asm/ftrace.h |    5 +++++
> >  1 files changed, 5 insertions(+), 0 deletions(-)
> > 
> > diff --git a/arch/x86/include/asm/ftrace.h b/arch/x86/include/asm/ftrace.h
> > index bd2c651..ddc9236 100644
> > --- a/arch/x86/include/asm/ftrace.h
> > +++ b/arch/x86/include/asm/ftrace.h
> > @@ -59,6 +59,11 @@ struct dyn_arch_ftrace {
> >  };
> >  
> >  #endif /*  CONFIG_DYNAMIC_FTRACE */
> > +
> > +#ifdef CONFIG_FUNCTION_GRAPH_TRACER
> > +extern void prepare_ftrace_return(unsigned long *, unsigned long);
> > +#endif
> > +
> 
> The only caller is from assembly, so this patch is unnecessary. Unless we 
> have some rule that all functions must have a prototype, even when it is 
> only called from assembly.
> 

Then:

diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c
index 18dfa30..75c0682 100644
--- a/arch/x86/kernel/ftrace.c
+++ b/arch/x86/kernel/ftrace.c
@@ -408,6 +408,7 @@ int ftrace_disable_ftrace_graph_caller(void)
  * Hook the return address and push it in the stack of return addrs
  * in current thread info.
  */
+asmlinkage
 void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr)
 {
        unsigned long old;


Josh: Do you think sparse should not warn like for this case.
What will be the best solution for this case.

--
JSR


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