[openib-general] Re: Re: librdmacm/ucma

[Michael S. Tsirkin]

Quoting r. Sean Hefty <mshefty at ichips.intel.com>:
> Subject: Re: Re: librdmacm/ucma
> 
> Michael S. Tsirkin wrote:
> >In normal usage I expect we must not break the ABI, but should rather
> >extend it - without breaking userspace. How do you extend the ABI?
> >not by bumping the ABI revision? How does userspace find out
> >whether kernel supports new features?
> 
> If the ABI didn't break, can't userspace just make the call for the new 
> feature and check the return code?

Put another way - why do you already have backward compatibility hacks
in lirdmacm? There wasn't any released version of cma, was there?

-- 
MST