linux-kernel - Re: [PATCH] serial: 8250: fix a sparse warning

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Date:	Mon, 9 Mar 2015 09:53:16 +0100
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Zhang Zhen <zhenzhang.zhang@...wei.com>
Cc:	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
	tim.kryger@...aro.org, jamie@...ieiles.com, alan@...ux.intel.com,
	arnd@...db.de
Subject: Re: [PATCH] serial: 8250: fix a sparse warning

On Mon, Mar 09, 2015 at 04:41:00PM +0800, Zhang Zhen wrote:
> On 2015/3/9 16:22, Greg KH wrote:
> > On Mon, Mar 09, 2015 at 03:42:30PM +0800, Zhang Zhen wrote:
> >> drivers/tty/serial/8250/8250_core.c: In function ‘serial8250_console_write’:
> >> drivers/tty/serial/8250/8250_core.c:3244: warning: ‘flags’ may be used u
> >> unitialized in this function
> >>
> >> Signed-off-by: Zhang Zhen <zhenzhang.zhang@...wei.com>
> >> ---
> >>  drivers/tty/serial/8250/8250_core.c | 2 +-
> >>  1 file changed, 1 insertion(+), 1 deletion(-)
> >>
> >> diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
> >> index deae122..50702e2 100644
> >> --- a/drivers/tty/serial/8250/8250_core.c
> >> +++ b/drivers/tty/serial/8250/8250_core.c
> >> @@ -3241,7 +3241,7 @@ serial8250_console_write(struct console *co, const char *s, unsigned int count)
> >>  {
> >>  	struct uart_8250_port *up = &serial8250_ports[co->index];
> >>  	struct uart_port *port = &up->port;
> >> -	unsigned long flags;
> >> +	unsigned long flags = 0;
> >>  	unsigned int ier;
> >>  	int locked = 1;
> >>
> > 
> > Sparse generated this?  Or did a broken / old version of gcc?
> > 
> Sorry, it's a gcc warning.
> 
> My gcc version is:
> gcc (SUSE Linux) 4.3.4 [gcc-4_3-branch revision 152973]

That's really old and obsolete, please use a modern version of gcc,
especially when sending in patches for compiler warnings.

greg k-h
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