[ofa-general] Re: [PATCH] for-2.6.23 ib/umad: add partition support

[Hal Rosenstock]

On Fri, 2007-06-22 at 12:53, Roland Dreier wrote:
>  > The only question is what happens with apps which enable the pkey index
>  > mode but run on an older kernel which does not support this. They would
>  > get an error back (-ENOIOCTLCMD) from user_mad. They could either error
>  > out on this or continue on depending on what the app wants to do.
> 
> Yes, but I think that is purely up to the application.  Userspace
> knows about the new interface, the kernel doesn't, and the application
> has to decide how important the pkey_index stuff is.
> 
> Given that we don't have a time machine (so the behavior of old
> kernels is frozen) I don't see anything we can do to make this any better.

Agreed. This is an app and/or library issue.

-- Hal

>  - R.