netdev - Re: [PATCH net-next 0/5] Remove uses of kmap

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Date:   Wed, 23 Nov 2022 09:34:58 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Anirudh Venkataramanan <anirudh.venkataramanan@...el.com>
Cc:     Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Ira Weiny <ira.weiny@...el.com>,
        "Fabio M . De Francesco" <fmdefrancesco@...il.com>
Subject: Re: [PATCH net-next 0/5] Remove uses of kmap_atomic()

On Tue, Nov 22, 2022 at 01:06:09PM -0800, Anirudh Venkataramanan wrote:
> On 11/22/2022 10:50 AM, Jakub Kicinski wrote:
> > On Tue, 22 Nov 2022 13:29:03 +0200 Leon Romanovsky wrote:
> > > >   drivers/net/ethernet/sun/cassini.c            | 40 ++++++-------------
> > > >   drivers/net/ethernet/sun/sunvnet_common.c     |  4 +-
> > > 
> > > Dave, Jakub, Paolo
> > > I wonder if these drivers can be simply deleted.
> > 
> > My thought as well. It's just a matter of digging thru the history,
> > platform code and the web to find potential users and contacting them.
> 
> I did a little bit of digging on these two files. Here's what I found.
> 
> For the cassini driver, I don't see any recent patches that fix an end user
> visible issue. There are clean ups, updates to use newer kernel APIs, and
> some build/memory leak fixes. I checked as far back as 2011. There are web
> references to some issues in kernel v2.6. I didn't see anything more recent.
> 
> The code in sunvnet_common.c seems to be common code that's used by
> 
> [1] "Sun4v LDOM Virtual Switch Driver" (ldmvsw.c, kconfig flag
> CONFIG_LDMVSW)
> 
> [2] "Sun LDOM virtual network driver" (sunvnet.c, kconfig flag
> CONFIG_SUNVNET).
> 
> These two seem to have had some feature updates around 2017, but otherwise
> the situation is the same as cassini.

If there is a pole to delete them, I vote for deletion. :)

Thanks

> 
> Ani