> On Wed, 2012-10-10 at 15:59 +0100, David Laight wrote:
> > Seems to me the code is expecting 256 bits of data, not any multiple of int,
> > long or anything else.
>
> include/linux/isdn_ppp.h:#define PPPIOCGCOMPRESSORS _IOR('t',134,unsigned long [8])
That doesn't mean the whole thing makes any sense on 64bit systems.
A whole load of historic code used 'long' to ensure 32bit.
Some of that might have crept into Linux sources.
Since I suspect there are a maximum of 256 bits on both 32 and 64bit
systems, I wouldn't like to guess exactly how any particular 64bit
application chooses to check the bitmap.
The ioctl constant may be wrong on 64 bit systems.
David
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