linux-kernel - Re: [PATCH] ALSA: compress: Cancel the optimization of compiler and fix the size of struct for all platform.

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Date:	Thu, 12 Jun 2014 11:59:20 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Vinod Koul <vinod.koul@...el.com>
Cc:	"Wang, Xiaoming" <xiaoming.wang@...el.com>, jeeja.kp@...el.com,
	dhowells@...hat.com, arnd@...db.de, tglx@...utronix.de,
	mtk.manpages@...il.com, paulmck@...ux.vnet.ibm.com,
	davej@...hat.com, linux-kernel@...r.kernel.org,
	dongxing.zhang@...el.com
Subject: Re: [PATCH] ALSA: compress: Cancel the optimization of compiler and fix the size of struct for all platform.

At Thu, 12 Jun 2014 14:55:13 +0530,
Vinod Koul wrote:
> 
> On Thu, Jun 12, 2014 at 06:47:07PM -0400, Wang, Xiaoming wrote:
> > Cancel the optimization of compiler for struct snd_compr_avail
> > which size will be 0x1c in 32bit kernel while 0x20 in 64bit
> > kernel under the optimizer. That will make compaction between
> > 32bit and 64bit. So add packed to fix the size of struct
> > snd_compr_avail to 0x1c for all platform.
> > 
> > Signed-off-by: Zhang Dongxing <dongxing.zhang@...el.com>
> > Signed-off-by: xiaoming wang <xiaoming.wang@...el.com>
> 
> Acked-by: Vinod Koul <vinod.koul@...el.com>
> 
> Takashi, can we cc stable on this, would help fixing in older kernels too

Yes, applied with Cc to stable now.


thanks,

Takashi

> 
> Thanks
> -- 
> ~Vinod
> > ---
> >  include/uapi/sound/compress_offload.h |    2 +-
> >  1 files changed, 1 insertions(+), 1 deletions(-)
> > 
> > diff --git a/include/uapi/sound/compress_offload.h b/include/uapi/sound/compress_offload.h
> > index 5759810..21eed48 100644
> > --- a/include/uapi/sound/compress_offload.h
> > +++ b/include/uapi/sound/compress_offload.h
> > @@ -80,7 +80,7 @@ struct snd_compr_tstamp {
> >  struct snd_compr_avail {
> >  	__u64 avail;
> >  	struct snd_compr_tstamp tstamp;
> > -};
> > +} __attribute__((packed));
> >  
> >  enum snd_compr_direction {
> >  	SND_COMPRESS_PLAYBACK = 0,
> > -- 
> > 1.7.1
> > 
> 
> -- 
> 
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