linux-kernel - Re: ftrace breaks sparc64 build

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Date:	Tue, 6 Jan 2009 00:11:36 +0100
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Sam Ravnborg <sam@...nborg.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <srostedt@...hat.com>,
	Ingo Molnar <mingo@...e.hu>,
	"David S. Miller" <davem@...emloft.net>,
	sparclinux <sparclinux@...r.kernel.org>
Subject: Re: ftrace breaks sparc64 build

On Mon, Jan 05, 2009 at 05:14:22PM -0500, Steven Rostedt wrote:
> 
> On Mon, 5 Jan 2009, Sam Ravnborg wrote:
> 
> > > Is this all sparc cross compiler?  I'm trying to reproduce it on x86 with 
> > > no avail :-(
> > > 
> > > I would like to test other ways to change the macro, but to do so, I need 
> > > to get a compiler that will produce the warnings that you see. What 
> > > version of gcc are you using?
> > 
> > I used crosstool to build a 3.4.5 gcc:
> 
> Hmm, that's a pretty old compiler. I wonder if it wouldn't just help
> if we just make the branch tracer dependent on the compiler used. That is.
> 
> #if defined(CONFIG_PROFILE_ALL_BRANCHES) && (__GNUC__ >= 4)
> #define if(cond) ...
> 
> Or something :-/

FWIW, on s390 with gcc 4.3.2 and an allyesconfig I get these:

  CC      arch/s390/mm/extmem.o
arch/s390/mm/extmem.c: In function 'segment_modify_shared':
arch/s390/mm/extmem.c:572: warning: 'end_addr' may be used uninitialized in this function
arch/s390/mm/extmem.c:572: warning: 'start_addr' may be used uninitialized in this function
arch/s390/mm/extmem.c: In function 'query_segment_type':
arch/s390/mm/extmem.c:259: warning: 'vmrc' may be used uninitialized in this function

Switching off PROFILE_ALL_BRANCHES makes the warnings go away again.
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