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From: Takashi Iwai <tiwai@suse.de>
To: Clemens Ladisch <clemens@ladisch.de>
Cc: Joshua Roys <roysjosh@gmail.com>,
	alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH]  Fix a compile warning under gcc-4.2.3.
Date: Thu, 21 Feb 2008 12:19:14 +0100	[thread overview]
Message-ID: <s5hwsoyo8ul.wl%tiwai@suse.de> (raw)
In-Reply-To: <47BD3ADE.8040501@ladisch.de>

At Thu, 21 Feb 2008 09:48:30 +0100,
Clemens Ladisch wrote:
> 
> Joshua Roys wrote:
> > sound/core/init.c: In function ‘snd_card_disconnect’:
> > sound/core/init.c:307: warning: the address of ‘snd_shutdown_f_ops’ will always evaluate as ‘true’
> >
> > Signed-off-by: Joshua Roys <roysjosh@gmail.com>
> > ---
> >  sound/core/init.c |    1 -
> >  1 files changed, 0 insertions(+), 1 deletions(-)
> >
> > diff --git a/sound/core/init.c b/sound/core/init.c
> > index 2cb7099..1afc58b 100644
> > --- a/sound/core/init.c
> > +++ b/sound/core/init.c
> > @@ -304,7 +304,6 @@ int snd_card_disconnect(struct snd_card *card)
> >  		list_add(&mfile->shutdown_list, &shutdown_files);
> >  		spin_unlock(&shutdown_lock);
> >
> > -		fops_get(&snd_shutdown_f_ops);
> >  		mfile->file->f_op = &snd_shutdown_f_ops;
> >  		
> >  		mfile = mfile->next;
> 
> This change may get rid of the warning, but is has the slight
> disadvantage that the kernel will blow up if you try to unload the sound
> modules before all device files have been closed.
> 
> If you want to get rid of this warning, tell the compiler that fops_get
> knows what it does; or try making fops_get an inline function instead of
> a macro.

This was already fixed in a different way on 2.6.25-rc.

commit bc9abce0de0b180817bc7e9f73145ef0b6a464ef
Author: Miguel Boton <mboton@gmail.com>
Date:   Sun Jan 13 12:03:53 2008 +0100

    [ALSA] fix compilation warning in GCC
    
    'snd_shutdown_f_ops' is not a pointer so its address will never be NULL.
    GCC will complain because 'fops_get' will do an unnecessary check because
    '&snd_shutdown_f_ops' is always true.
    

Takashi
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WARNING: multiple messages have this Message-ID (diff)
From: Takashi Iwai <tiwai@suse.de>
To: Clemens Ladisch <clemens@ladisch.de>
Cc: Joshua Roys <roysjosh@gmail.com>,
	alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org
Subject: Re: [alsa-devel] [PATCH]  Fix a compile warning under gcc-4.2.3.
Date: Thu, 21 Feb 2008 12:19:14 +0100	[thread overview]
Message-ID: <s5hwsoyo8ul.wl%tiwai@suse.de> (raw)
In-Reply-To: <47BD3ADE.8040501@ladisch.de>

At Thu, 21 Feb 2008 09:48:30 +0100,
Clemens Ladisch wrote:
> 
> Joshua Roys wrote:
> > sound/core/init.c: In function ‘snd_card_disconnect’:
> > sound/core/init.c:307: warning: the address of ‘snd_shutdown_f_ops’ will always evaluate as ‘true’
> >
> > Signed-off-by: Joshua Roys <roysjosh@gmail.com>
> > ---
> >  sound/core/init.c |    1 -
> >  1 files changed, 0 insertions(+), 1 deletions(-)
> >
> > diff --git a/sound/core/init.c b/sound/core/init.c
> > index 2cb7099..1afc58b 100644
> > --- a/sound/core/init.c
> > +++ b/sound/core/init.c
> > @@ -304,7 +304,6 @@ int snd_card_disconnect(struct snd_card *card)
> >  		list_add(&mfile->shutdown_list, &shutdown_files);
> >  		spin_unlock(&shutdown_lock);
> >
> > -		fops_get(&snd_shutdown_f_ops);
> >  		mfile->file->f_op = &snd_shutdown_f_ops;
> >  		
> >  		mfile = mfile->next;
> 
> This change may get rid of the warning, but is has the slight
> disadvantage that the kernel will blow up if you try to unload the sound
> modules before all device files have been closed.
> 
> If you want to get rid of this warning, tell the compiler that fops_get
> knows what it does; or try making fops_get an inline function instead of
> a macro.

This was already fixed in a different way on 2.6.25-rc.

commit bc9abce0de0b180817bc7e9f73145ef0b6a464ef
Author: Miguel Boton <mboton@gmail.com>
Date:   Sun Jan 13 12:03:53 2008 +0100

    [ALSA] fix compilation warning in GCC
    
    'snd_shutdown_f_ops' is not a pointer so its address will never be NULL.
    GCC will complain because 'fops_get' will do an unnecessary check because
    '&snd_shutdown_f_ops' is always true.
    

Takashi

  reply	other threads:[~2008-02-21 11:19 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-20 17:23 [PATCH] Fix a compile warning under gcc-4.2.3 Joshua Roys
2008-02-21  8:48 ` Clemens Ladisch
2008-02-21  8:48   ` [PATCH] [alsa-devel] " Clemens Ladisch
2008-02-21 11:19   ` Takashi Iwai [this message]
2008-02-21 11:19     ` [alsa-devel] [PATCH] " Takashi Iwai

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