linux-kernel - Re: [PATCH] ALSA: ymfpci: remove unused snd_ymfpci

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Date:   Sun, 19 Mar 2023 16:34:44 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Takashi Iwai <tiwai@...e.de>
Cc:     Tom Rix <trix@...hat.com>, perex@...ex.cz, tiwai@...e.com,
        ndesaulniers@...gle.com, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH] ALSA: ymfpci: remove unused snd_ymfpci_readb function

On Sun, Mar 19, 2023 at 09:09:22AM +0100, Takashi Iwai wrote:
> On Sat, 18 Mar 2023 14:27:08 +0100,
> Tom Rix wrote:
> > 
> > clang with W=1 reports
> > sound/pci/ymfpci/ymfpci_main.c:34:18: error:
> >   unused function 'snd_ymfpci_readb' [-Werror,-Wunused-function]
> > static inline u8 snd_ymfpci_readb(struct snd_ymfpci *chip, u32 offset)
> >                  ^
> > This static function is not used, so remove it.
> > 
> > Signed-off-by: Tom Rix <trix@...hat.com>
> 
> I applied now, but still wondering why it warns at all even if it's a
> static inline function...

See commit 6863f5643dd7 ("kbuild: allow Clang to find unused static
inline functions for W=1 build") for some more information. The key part
of the commit message is 'with W=1', this will not happen with a normal
clang build.

Cheers,
Nathan

> > ---
> >  sound/pci/ymfpci/ymfpci_main.c | 5 -----
> >  1 file changed, 5 deletions(-)
> > 
> > diff --git a/sound/pci/ymfpci/ymfpci_main.c b/sound/pci/ymfpci/ymfpci_main.c
> > index c80114c0ad7b..2858736ed20a 100644
> > --- a/sound/pci/ymfpci/ymfpci_main.c
> > +++ b/sound/pci/ymfpci/ymfpci_main.c
> > @@ -31,11 +31,6 @@
> >  
> >  static void snd_ymfpci_irq_wait(struct snd_ymfpci *chip);
> >  
> > -static inline u8 snd_ymfpci_readb(struct snd_ymfpci *chip, u32 offset)
> > -{
> > -	return readb(chip->reg_area_virt + offset);
> > -}
> > -
> >  static inline void snd_ymfpci_writeb(struct snd_ymfpci *chip, u32 offset, u8 val)
> >  {
> >  	writeb(val, chip->reg_area_virt + offset);
> > -- 
> > 2.27.0
> >