linux-kernel - Re: [EXT] Re: [PATCH v2 net 2/2] net: fec: restructuring the functions to avoid forward declarations

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Message-ID: <ZFJ+9Ij+jOJO1+wu@kernel.org>
Date:   Wed, 3 May 2023 17:34:12 +0200
From:   Simon Horman <horms@...nel.org>
To:     Shenwei Wang <shenwei.wang@....com>
Cc:     Andrew Lunn <andrew@...n.ch>, Wei Fang <wei.fang@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Clark Wang <xiaoning.wang@....com>,
        dl-linux-imx <linux-imx@....com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Alexander Lobakin <alexandr.lobakin@...el.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "imx@...ts.linux.dev" <imx@...ts.linux.dev>
Subject: Re: [EXT] Re: [PATCH v2 net 2/2] net: fec: restructuring the
 functions to avoid forward declarations

On Wed, May 03, 2023 at 12:53:57PM +0000, Shenwei Wang wrote:
> 
> 
> > -----Original Message-----
> > From: Andrew Lunn <andrew@...n.ch>
> > Sent: Tuesday, May 2, 2023 6:19 PM
> > To: Shenwei Wang <shenwei.wang@....com>
> > Cc: Wei Fang <wei.fang@....com>; David S. Miller <davem@...emloft.net>;
> > Eric Dumazet <edumazet@...gle.com>; Jakub Kicinski <kuba@...nel.org>;
> > Paolo Abeni <pabeni@...hat.com>; Clark Wang <xiaoning.wang@....com>; dl-
> > linux-imx <linux-imx@....com>; Alexei Starovoitov <ast@...nel.org>; Daniel
> > Borkmann <daniel@...earbox.net>; Jesper Dangaard Brouer
> > <hawk@...nel.org>; John Fastabend <john.fastabend@...il.com>; Alexander
> > Lobakin <alexandr.lobakin@...el.com>; netdev@...r.kernel.org; linux-
> > kernel@...r.kernel.org; imx@...ts.linux.dev
> > Subject: [EXT] Re: [PATCH v2 net 2/2] net: fec: restructuring the functions to
> > avoid forward declarations
> > 
> > Caution: This is an external email. Please take care when clicking links or
> > opening attachments. When in doubt, report the message using the 'Report this
> > email' button
> > 
> > 
> > On Tue, May 02, 2023 at 05:08:18PM -0500, Shenwei Wang wrote:
> > > The patch reorganizes functions related to XDP frame transmission,
> > > moving them above the fec_enet_run_xdp implementation. This eliminates
> > > the need for forward declarations of these functions.
> > 
> > I'm confused. Are these two patches in the wrong order?
> > 
> > The reason that i asked you to fix the forward declaration in net-next is that it
> > makes your fix two patches. Sometimes that is not obvious to people back
> > porting patches, and one gets lost, causing build problems. So it is better to have
> > a single patch which is maybe not 100% best practice merged to stable, and then
> > a cleanup patch merged to the head of development.
> > 
> 
> If that is the case, we should forgo the second patch. Its purpose was to
> reorganize function order such that the subsequent patch to net-next
> enabling XDP_TX would not encounter forward declaration issues.

I think a good plan would be, as I understood Andrew's original suggestion,
to:

1. Only have patch 2/2, targeted at 'net', for now
2. Later, once that patch has been accepted into 'net', 'net-next' has
   reopened, and that patch is present in 'net-next', then follow-up
   with patch 1/2, which is a cleanup.