linux-kernel - Re: [PATCH] snd: aica - fix annoying compiler warning

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Date:	Mon, 16 Mar 2009 08:59:20 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Adrian McMenamin <adrian@...golddream.dyndns.info>
Cc:	Alsa-devel <alsa-devel@...ts.sourceforge.net>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-sh <linux-sh@...r.kernel.org>
Subject: Re: [PATCH] snd: aica - fix annoying compiler warning

At Mon, 16 Mar 2009 07:54:09 +0000,
Adrian McMenamin wrote:
> 
> On Mon, 2009-03-16 at 07:31 +0100, Takashi Iwai wrote:
> > At Sun, 15 Mar 2009 22:05:40 +0000,
> > Adrian McMenamin wrote:
> > > 
> > > Cast pointer to data member of struct firmware as a void to end an
> > > annoying compiler warning.
> > > 
> > > fix annoying compiler warning
> > > 
> > > Signed-off-by: Adrian McMenamin <adrian@...en.demon.co.uk>
> > > ---
> > > 
> > > diff --git a/sound/sh/aica.c b/sound/sh/aica.c
> > > index 7c920f3..822b119 100644
> > > --- a/sound/sh/aica.c
> > > +++ b/sound/sh/aica.c
> > > @@ -567,7 +567,7 @@ static int load_aica_firmware(void)
> > >  		return err;
> > >  	/* write firware into memory */
> > >  	spu_disable();
> > > -	spu_memload(0, fw_entry->data, fw_entry->size);
> > > +	spu_memload(0, (void *)fw_entry->data, fw_entry->size);
> > 
> > IMO, it's better to fix spu_memload() to take const pointer instead of 
> > cast.
> > 
> 
> If that's what you want I can do that but it adds to kernel bloat by
> having two functions essentially do the same thing.

I meant a fix like below...


Takashi

---
diff --git a/sound/sh/aica.c b/sound/sh/aica.c
index f551233..fad0c47 100644
--- a/sound/sh/aica.c
+++ b/sound/sh/aica.c
@@ -119,10 +119,10 @@ static void spu_memset(u32 toi, u32 what, int length)
 }
 
 /* spu_memload - write to SPU address space */
-static void spu_memload(u32 toi, void *from, int length)
+static void spu_memload(u32 toi, const void *from, int length)
 {
 	unsigned long flags;
-	u32 *froml = from;
+	const u32 *froml = from;
 	u32 __iomem *to = (u32 __iomem *) (SPU_MEMORY_BASE + toi);
 	int i;
 	u32 val;
--
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