linux-kernel - 32 bit user space compatibility

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Message-ID: <AD975D71AAD7784D8D1265DF6444C2FD0C4307FC@storexdag03.amd.com>
Date:	Sun, 26 Oct 2014 12:25:08 +0000
From:	"Skidanov, Alexey" <Alexey.Skidanov@....com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: 32 bit user space compatibility

Hi,

Running 32 bit user space needs some work to be done with ioctls. I understand that there are two options to implement:
1.       Use only fixed size types. Pad IOCTLS params to multiple of 64 bits - simple; don't know if it covers all compatibility issues; 
2.       32 bit compatibility layer (through compat_ioctl, just like many drivers in kernel implement)  - just a little bit simple code with some translations; really covers all issues;

Which one is preferred by kernel community?

Thanks
Alexey
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