linux-kernel - Re: linux-next: build failure after merge of the akpm tree

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Message-Id: <20160115151401.03fe1a39ca397079407c2ca9@linux-foundation.org>
Date:	Fri, 15 Jan 2016 15:14:01 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
Cc:	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Vinod Koul <vinod.koul@...ux.intel.com>,
	Takashi Iwai <tiwai@...e.de>,
	Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Subject: Re: linux-next: build failure after merge of the akpm tree

On Sat, 16 Jan 2016 10:00:47 +1100 Stephen Rothwell <sfr@...b.auug.org.au> wrote:

> Hi Andrew,
> > +#define SNDRV_COMPRESS_GET_CODEC_CAPS	_IOWR('C', 0x11, struct snd_compr_caps)
> >  #define SNDRV_COMPRESS_SET_PARAMS	_IOW('C', 0x12, struct snd_compr_params)
> >  #define SNDRV_COMPRESS_GET_PARAMS	_IOR('C', 0x13, struct snd_codec)
> >  #define SNDRV_COMPRESS_SET_METADATA	_IOW('C', 0x14,\
> > 
> > then it compiles OK.  So there's something special about `struct
> > snd_compr_codec_caps' which is confusing the compiler.
> 
> Its very big (hint, I think it is bigger than 1 << 13).

ah-hah.

sizeof(struct snd_compr_codec_caps) is 11144 on x86_64
allyesconfig, but x86_64 uses (1<<14), not (1<<13) - x86_64 has more
space in the ioctl payload.


So.  Sound guys: your struct snd_compr_codec_caps is too large for
powerpc ioctls.