On Sun, 26 Oct 2014 12:25:08 +0000 "Skidanov, Alexey" <alexey.skida...@amd.com> wrote:
> 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? You shouldn't need to pad paramters in most cases as platform alignment rules are usually sane for 32 and 64bit. #1 is preferred. #2 exists because 64bit appeared after Linux was designed so it wasn't designed in from day one. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
