Re: [PATCH rdma-next 4/6] RDMA/core: Move HFI1 IOCTL declarations to common file

[Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>]

On Wed, Aug 17, 2016 at 02:16:31AM -0400, ira.weiny wrote:
> On Tue, Aug 16, 2016 at 04:45:21PM +0300, Leon Romanovsky wrote:
> > From: Leon Romanovsky <leonro-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
> > 
> > Move HFI1 IOCTL declarations to rdma_user_ioctl.h file.
> 
> I have not tried with the patch but I'm 99% sure this will break the PSM2
> library build which includes hfi1_user.h.
> 
> This is one of those things I have pondered in the past.  Most of the rdma
> libraries don't actually use these definitions directly.  PSM2 does.
> 
> I'm not sure what other libraries do.

They should all be fixed to use the new uapi headers instead of
cloning them privately. If we go ahead with the rdma-plumbing I might
even do it..

> In the final patch of this series you admit that the name changes in that patch
> will break userspace which uses the defines directly.  Can we, should we, do
> that?

This happens from time to time, userspace should gain a build-time
test to deal with it, if it is a big enough deal, IMHO.

We don't guarentee 100% source compatibility..

Jason
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