linux-kernel - Re: [PATCH] ALSA: fix function cast warnings

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Date: Tue, 13 Feb 2024 14:52:43 +0100
From: Takashi Iwai <tiwai@...e.de>
To: "Arnd Bergmann" <arnd@...db.de>
Cc: "Takashi Iwai" <tiwai@...e.de>,
	"Arnd Bergmann" <arnd@...nel.org>,
	"Jaroslav Kysela" <perex@...ex.cz>,
	"Takashi Iwai" <tiwai@...e.com>,
	"Nathan Chancellor" <nathan@...nel.org>,
	"Nick Desaulniers" <ndesaulniers@...gle.com>,
	"Bill Wendling" <morbo@...gle.com>,
	"Justin Stitt" <justinstitt@...gle.com>,
	"Curtis Malainey" <cujomalainey@...omium.org>,
	"Dmitry Antipov" <dmantipov@...dex.ru>,
	linux-sound@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	llvm@...ts.linux.dev
Subject: Re: [PATCH] ALSA: fix function cast warnings

On Tue, 13 Feb 2024 14:30:56 +0100,
Arnd Bergmann wrote:
> 
> On Tue, Feb 13, 2024, at 13:56, Takashi Iwai wrote:
> > On Tue, 13 Feb 2024 11:09:56 +0100,
> 
> >>  
> >> -int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
> >> -			const unsigned char *buffer, int count);
> >> +int snd_rawmidi_receive(void *ptr, const void *buffer, int count);
> >
> > If it were only about the type of the buffer argument being a void
> > pointer, it's fine.  But the substream argument should be explicitly
> > typed, otherwise it's confusing for other normal call patterns.
> >
> > I guess the suitable fix for now would be to provide wrapper functions
> > that are used for callbacks and bridge to the actual function with
> > pointer cast, something like below.  Eventually we can put more const,
> > but it's basically irrelevant with the warning itself.
> 
> Right, makes sense. I gave your patch a spin and it addresses the
> warnings I saw in randconfig builds, so please apply that with
> "Reported-by: Arnd Bergmann <arnd@...db.de>".

OK, will do.


thanks,

Takashi