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

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Message-ID: <20140612092513.GA22053@intel.com>
Date:	Thu, 12 Jun 2014 14:55:13 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	"Wang, Xiaoming" <xiaoming.wang@...el.com>
Cc:	tiwai@...e.de, 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.

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

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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