linux-kernel - Re: [BACKPORT 4.4.y 02/25] ALSA: compress: add support for 32bit calls in a 64bit kernel

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Date:   Tue, 26 Mar 2019 10:09:11 +0900
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     stable@...r.kernel.org, Vinod Koul <vkoul@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Ravindra Lokhande <rlokhande@...dia.com>,
        Vinod Koul <vinod.koul@...el.com>,
        Takashi Iwai <tiwai@...e.de>, Mark Brown <broonie@...nel.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Joe Perches <joe@...ches.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [BACKPORT 4.4.y 02/25] ALSA: compress: add support for 32bit
 calls in a 64bit kernel

On Fri, Mar 22, 2019 at 04:43:53PM +0100, Arnd Bergmann wrote:
> From: Ravindra Lokhande <rlokhande@...dia.com>
> 
> Compress offload does not support ioctl calls from a 32bit userspace
> in a 64 bit kernel. This patch adds support for ioctls from a 32bit
> userspace in a 64bit kernel
> 
> Signed-off-by: Ravindra Lokhande <rlokhande@...dia.com>
> Acked-by: Vinod Koul <vinod.koul@...el.com>
> Signed-off-by: Takashi Iwai <tiwai@...e.de>
> (cherry picked from commit c10368897e104c008c610915a218f0fe5fa4ec96)
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  sound/core/compress_offload.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)

How is this not a "new feature"?  What bug does this fix?  Has this ever
worked in the past?

thanks,

greg k-h