From: Arjan van de Ven <arjan@infradead.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: David Miller <davem@davemloft.net>,
tony@bakeyournoodle.com, linux-kernel@vger.kernel.org,
benh@kernel.crashing.org
Subject: Re: [PATCH] Silence 'ignoring return value' warnings in drivers/video/aty/radeon_base.c
Date: Tue, 6 May 2008 21:00:55 -0700 [thread overview]
Message-ID: <20080506210055.75e2f881@infradead.org> (raw)
In-Reply-To: <20080506145608.565b61bf.akpm@linux-foundation.org>
On Tue, 6 May 2008 14:56:08 -0700
Andrew Morton <akpm@linux-foundation.org> wrote:
> On Tue, 06 May 2008 14:43:01 -0700 (PDT)
> David Miller <davem@davemloft.net> wrote:
>
> > From: Andrew Morton <akpm@linux-foundation.org>
> > Date: Tue, 6 May 2008 14:39:36 -0700
> >
> > > On Thu, 24 Apr 2008 14:34:01 +1000
> > > tony@bakeyournoodle.com (Tony Breeds) wrote:
> > >
> > > > Current kernel builds warn about:
> > > > drivers/video/aty/radeon_base.c: In function
> > > > 'radeonfb_pci_register': drivers/video/aty/radeon_base.c:2334:
> > > > warning: ignoring return value of 'sysfs_create_bin_file',
> > > > declared with attribute warn_unused_result
> > > > drivers/video/aty/radeon_base.c:2336: warning: ignoring return
> > > > value of 'sysfs_create_bin_file', declared with attribute
> > > > warn_unused_result
> > > >
> > > > Do minimal checking of these functions and issue a warning if
> > > > either fails. They don't seem to be critical..
> > >
> > > well OK, but I object to the patch title!
> > >
> > > The point isn't to silence warnings. It is to fix the problem
> > > which that warning is drawing our attention to.
> > >
> > > So I rewrote the title to "drivers/video/aty/radeon_base.c:
> > > notify user if sysfs_create_bin_file() failed".
> > >
> > > And your fix looks appropriate - if sysfs_create_bin_file() fails
> > > we will now get reports of this and we can find out what kernel
> > > bug caused this to happen.
> >
> > The last time someone "fixed" this warning in the radeon driver,
> > people lost their consoles.
> >
> > Just giving a heads up...
>
> heh, thanks.
>
> This one just emits a warning:
>
> @@ -2340,9 +2341,12 @@ static int __devinit radeonfb_pci_regist
>
> /* Register some sysfs stuff (should be done better) */
> if (rinfo->mon1_EDID)
> - sysfs_create_bin_file(&rinfo->pdev->dev.kobj,
> &edid1_attr);
> + err |= sysfs_create_bin_file(&rinfo->pdev->dev.kobj,
> &edid1_attr); if (rinfo->mon2_EDID)
> - sysfs_create_bin_file(&rinfo->pdev->dev.kobj,
> &edid2_attr);
> + err |= sysfs_create_bin_file(&rinfo->pdev->dev.kobj,
> &edid2_attr);
> + if (err)
> + pr_warning("%s() Creating sysfs files failed,
> continuing\n",
> + __func__);
>
> /* save current mode regs before we switch into the new one
> * so we can restore this upon __exit
> _
>
>
> So from what you say, it sounds like we will be seeing that warning.
> I wonder why.
can we make it a WARN_ON() as well? that way we'll see it in various
kerneloops.org stats etc etc.. and we also get a nice backtrace for
free to go with it....
(rationale: users tend to not read their dmesg much, but WARN_ON()'s do
get noticed)
next prev parent reply other threads:[~2008-05-07 4:01 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-24 4:34 [PATCH] Silence 'ignoring return value' warnings in drivers/video/aty/radeon_base.c Tony Breeds
2008-05-06 21:39 ` Andrew Morton
2008-05-06 21:43 ` David Miller
2008-05-06 21:56 ` Andrew Morton
2008-05-07 4:00 ` Arjan van de Ven [this message]
2008-05-07 4:12 ` Andrew Morton
2008-05-07 4:15 ` Arjan van de Ven
2008-05-07 4:20 ` Arjan van de Ven
2008-05-07 4:37 ` Benjamin Herrenschmidt
2008-05-07 4:23 ` Andrew Morton
2008-05-07 4:26 ` Andrew Morton
2008-05-07 4:41 ` Arjan van de Ven
2008-05-07 4:37 ` Arjan van de Ven
2008-05-07 5:40 ` Paul Mackerras
2008-05-07 5:49 ` Benjamin Herrenschmidt
2008-05-07 0:54 ` Benjamin Herrenschmidt
2008-05-07 1:20 ` Andrew Morton
2008-05-07 4:33 ` Benjamin Herrenschmidt
2008-05-07 8:23 ` Cornelia Huck
2008-05-07 21:43 ` Benjamin Herrenschmidt
2008-05-08 7:34 ` Cornelia Huck
2008-05-08 7:49 ` Benjamin Herrenschmidt
2008-05-08 8:36 ` Cornelia Huck
2008-05-08 22:03 ` Greg KH
2008-05-08 23:06 ` Benjamin Herrenschmidt
2008-05-08 23:50 ` Paul Mackerras
2008-05-09 0:02 ` Harvey Harrison
2008-05-09 5:32 ` Cornelia Huck
2008-05-09 5:33 ` Cornelia Huck
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