linux-kernel - Re: ftrace breaks sparc64 build

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Date:	Mon, 5 Jan 2009 16:52:02 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Sam Ravnborg <sam@...nborg.org>
cc:	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, 5 Jan 2009, Sam Ravnborg wrote:

> > 
> > Probably the same issue. The problem is that the first use of a variable 
> > is in the OR section of an if statement that does a return.
> > 
> > 	if (x || !(y = init_me())
> > 		return;
> > 
> > 	use_me(y);
> > 
> 
> More warnings:
> fs/partitions/check.c: In function `rescan_partitions':
> fs/partitions/check.c:511: warning: 'state' might be used uninitialized in this function
> 
> => follow same pattern
> 
> fs/compat_ioctl.c: In function `ppp_sock_fprog_ioctl_trans':
> fs/compat_ioctl.c:859: warning: 'fptr32' might be used uninitialized in this function
> fs/compat_ioctl.c: In function `do_fontx_ioctl':
> fs/compat_ioctl.c:1082: warning: 'data' might be used uninitialized in this function
> fs/compat_ioctl.c: In function `do_atmif_sioc':
> fs/compat_ioctl.c:1302: warning: 'data' might be used uninitialized in this function
> fs/compat_ioctl.c: In function `do_atm_ioctl':
> fs/compat_ioctl.c:1272: warning: 'data' might be used uninitialized in this function
> fs/compat_ioctl.c: In function `mtd_rw_oob':
> fs/compat_ioctl.c:1421: warning: 'data' might be used uninitialized in this function
> fs/compat_ioctl.c: In function `do_usbdevfs_discsignal':
> fs/compat_ioctl.c:1650: warning: 'uctx' might be used uninitialized in this function
> 
> This is:
>         if (get_user(flen, &u_fprog32->len) ||
>             get_user(fptr32, &u_fprog32->filter))
>                 return -EFAULT;

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?

Thanks,

-- Steve


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