Subject: Re: [PATCH] Fix __ucmpdi2 in v4l2_norm_to_name()
From: Mauro Carvalho Chehab <mchehab@infradead.org>
To: Andrew Morton <akpm@osdl.org>
Cc: Stelian Pop <stelian@popies.net>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Linus Torvalds <torvalds@osdl.org>, v4l-dvb-maintainer@linuxtv.org
In-Reply-To: <20070104144825.68fec948.akpm@osdl.org>
References: <1167909014.20853.8.camel@localhost.localdomain>
	 <20070104144825.68fec948.akpm@osdl.org>
Content-Type: text/plain; charset=ISO-8859-1
Date: Thu, 04 Jan 2007 20:59:08 -0200
Message-Id: <1167951548.12012.55.camel@praia>
Mime-Version: 1.0
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1706
Lines: 52

Em Qui, 2007-01-04 ?s 14:48 -0800, Andrew Morton escreveu:
> On Thu, 04 Jan 2007 12:10:14 +0100
> Stelian Pop <stelian@popies.net> wrote:
> 
> > Hi,
> > 
> > This patch replaces a switch statement using 64 bit values with the
> > if/else equivalent in order to prevent a call __ucmpdi2 generated by
> > some versions of gcc (verified with gcc-4.1.2 20060928):
> > 
> > 	drivers/built-in.o: In function `v4l2_norm_to_name':
> > 	(.text+0x71100): undefined reference to `__ucmpdi2'
> > 
> > Signed-off-by: Stelian Pop <stelian@popies.net>
> > 
> > ---
> > 
> >  drivers/media/video/v4l2-common.c |  126 ++++++++++++++++++-------------------
> >  1 files changed, 62 insertions(+), 64 deletions(-)
> > 
> > diff --git a/drivers/media/video/v4l2-common.c b/drivers/media/video/v4l2-common.c
> > index 752c82c..0c3c2f6 100644
> > --- a/drivers/media/video/v4l2-common.c
> > +++ b/drivers/media/video/v4l2-common.c
> > @@ -91,70 +91,68 @@ char *v4l2_norm_to_name(v4l2_std_id id)
> >  {
> >  	char *name;
> >  
> > -	switch (id) {
> 
> It'd be simpler to just do
> 
> 	switch ((unsigned int)id) {
> 
> here (with a suitable comment).
> 
> The largest value we use here is 0x02000000.  Perhaps v4l2_std_id shouldn't
> be 64-bit?
Too late to change it to 32 bits. It is at V4L2 userspace API since
kernel 2.6.0. We can, however use this approach as a workaround, with
the proper documentation. I'll handle it after I return from vacations
next week.

> 
Cheers, 
Mauro.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/