linux-kernel - Re: SB16 build error.

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Message-ID: <s5h39iry3xp.wl%tiwai@suse.de>
Date:	Thu, 30 Jun 2011 13:05:54 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Ralf Baechle <ralf@...ux-mips.org>
Cc:	Jaroslav Kysela <perex@...ex.cz>, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org,
	florian@...ux-mips.org, Florian Fainelli <florian@...nwrt.org>,
	linux-arch@...r.kernel.org, Richard Henderson <rth@...ddle.net>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Matt Turner <mattst88@...il.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	"David S. Miller" <davem@...emloft.net>, sparclinux@...r.kernel.org
Subject: Re: SB16 build error.

At Thu, 30 Jun 2011 11:52:54 +0100,
Ralf Baechle wrote:
> 
> On Thu, Jun 30, 2011 at 12:15:56PM +0200, Takashi Iwai wrote:
> 
> > At Thu, 30 Jun 2011 10:17:54 +0100,
> > Ralf Baechle wrote:
> > > 
> > > Found on a MIPS build but certain other architectures will have the same
> > > issue:
> > > 
> > >   CC      sound/isa/sb/sb16_csp.o
> > > sound/isa/sb/sb16_csp.c: In function ‘snd_sb_csp_ioctl’:
> > > sound/isa/sb/sb16_csp.c:228: error: case label does not reduce to an integer constant
> > > make[1]: *** [sound/isa/sb/sb16_csp.o] Error 1
> > > make: *** [sound/isa/sb/sb16_csp.o] Error 2
> > > 
> > > This error message is caused by the _IOC_TYPECHECK() error check triggering
> > > due to excessive ioctl size on Alpha, PowerPC, MIPS and SPARC which define
> > > _IOC_SIZEBITS as 13.  On all other architectures define it as 14 so struct
> > > snd_sb_csp_microcode with it's little over 12kB will just about fit into
> > > the 16kB limit.
> > 
> > What about the patch below?
> 
> I have no idea how big the soundblaster microcode being loaded actually is,
> that is if the reduced size of 0x1f00 will be sufficient.

The files found in /lib/firmware/sb16 are all under 2kB, thus likely
sufficient.

> Aside of that I
> don't see a problem - I don't see how the old ioctl can possibly have been
> used before so there isn't a compatibility problem.
> 
> Or you could entirely sidestep the problem and use request_firmware() but
> I guess that's more effort than you want to invest.

Yeah, that's another option I thought of.  But it's too intrusive for
3.0-rc6, so I'd like waive it for 3.1.

> > This is an old ISA driver, so the impact must be very low.
> 
> True.  I notice that sort of stuff in automated mass builds - not
> necessarily the sort of kernels one would actually use.  Still build errors
> are annoying :)

Right, better to fix it up quickly.


thanks,

Takashi
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