linux-kernel - Re: [PATCH] net: dsa: mv88e6xxx: don't dispose of Global2 IRQ mappings from mdiobus code

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Message-ID: <e3ae62c36cfe49abc5371009ba6c29cddc2f2ebe.camel@gmail.com>
Date:   Wed, 15 Mar 2023 07:07:57 +0100
From:   Klaus Kudielka <klaus.kudielka@...il.com>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Richard Cochran <richardcochran@...il.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Vladimir Oltean <vladimir.oltean@....com>
Subject: Re: [PATCH] net: dsa: mv88e6xxx: don't dispose of Global2 IRQ
 mappings from mdiobus code

On Tue, 2023-03-14 at 22:01 +0200, Vladimir Oltean wrote:
> 
> I'm a bit puzzled as to how you managed to get just this one patch to
> have a different subject-prefix from the others?

A long story, don't laugh at me.

I imported your patch with "git am", but I imported the "mbox" of the
complete message. That was the start of the disaster.

The whole E-mail was in the commit message (also the notes before the
patch), but that was easy to fix.

After git format-patch, checkpatch complained that your "From" E-mail
!= "Signed-off-by" E-mail. Obviously git has taken the "From" from the
first E-mail header.

I looked again at your patch, there it was right, and there was also
a different date (again same root cause).

So I took the shortcut: Just copy/pasted the whole patch header into
the generated patch file, without thinking further -> Boom.

(a) Don't use "git am" blindly
(b) Don't take shortcuts in the process