>> for example new hw with unexpected features appears and allows kernel
>> driver changes, that you may want to do for whatever reason
>> (effectivity, security, etc).
>
>That's exactly what a kernel API should do. Using a userspace API to be
>able to change the kernel API without problems just moves the problem
>and still doesn't bring us anywhere.

Apart from IMHO:
(1) The difference in hardware so that great that quite complex code needs
to be written to provide a consistent API.
(2) Other functions which are part of the user space standard C library need
to be used i.e. mathematical functions.

Certain things if done as part of the driver are much faster and therefore a
strong justification exists.  Personally I would rather have as much of the
complex code as possible in a user space library.  If a bug exists in the
user space library then just the application is affected, if its part of the
kernel then potentially the whole machine hangs.

Dave 



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