netdev - Re: [RFC 20/20] RDMA/i40iw: Mark i40iw as deprecated

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Message-ID: <bc18503dcace47150d5f45e8669d7978e18a38f9.camel@redhat.com>
Date:   Fri, 27 Sep 2019 16:17:15 -0400
From:   Doug Ledford <dledford@...hat.com>
To:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "Saleem, Shiraz" <shiraz.saleem@...el.com>
Cc:     Leon Romanovsky <leon@...nel.org>,
        "Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
        "jgg@...lanox.com" <jgg@...lanox.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>
Subject: Re: [RFC 20/20] RDMA/i40iw: Mark i40iw as deprecated

On Thu, 2019-09-26 at 21:55 +0200, gregkh@...uxfoundation.org wrote:
> On Thu, Sep 26, 2019 at 07:49:44PM +0000, Saleem, Shiraz wrote:
> > > Subject: Re: [RFC 20/20] RDMA/i40iw: Mark i40iw as deprecated
> > > 
> > > On Thu, Sep 26, 2019 at 09:45:19AM -0700, Jeff Kirsher wrote:
> > > > From: Shiraz Saleem <shiraz.saleem@...el.com>
> > > > 
> > > > Mark i40iw as deprecated/obsolete.
> > > > 
> > > > irdma is the replacement driver that supports X722.
> > > 
> > > Can you simply delete old one and add MODULE_ALIAS() in new
> > > driver?
> > > 
> > 
> > Yes, but we thought typically driver has to be deprecated for a few
> > cycles before removing it.
> 
> If you completely replace it with something that works the same, why
> keep the old one around at all?
> 
> Unless you don't trust your new code?  :)

I have yet to see, in over 20 years of kernel experience, a new driver
replace an old driver and not initially be more buggy and troublesome
than the old driver.  It takes time and real world usage for the final
issues to get sorted out.  During that time, the fallback is often
necessary for those real world users.

-- 
Doug Ledford <dledford@...hat.com>
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