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From: Thorsten Leemhuis <>
To: Javier Martinez Canillas <>,
	Daniel Vetter <>,,
	Thomas Zimmermann <>,
	Ilya Trukhanov <>,
	Sam Ravnborg <>
Subject: Re: [PATCH] fbdev: Prevent probing generic drivers if a FB is already registered
Date: Thu, 11 Nov 2021 10:58:14 +0100	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On 11.11.21 10:20, Javier Martinez Canillas wrote:
> The efifb and simplefb drivers just render to a pre-allocated frame buffer
> and rely on the display hardware being initialized before the kernel boots.
> But if another driver already probed correctly and registered a fbdev, the
> generic drivers shouldn't be probed since an actual driver for the display
> hardware is already present.
> Reported-by: Ilya Trukhanov <>
> Signed-off-by: Javier Martinez Canillas <>
> ---

TLDR: Javier, in case you need to send an improved patch, could you
please add this before the 'Reported-by:'


And if the patch is already good to go: could the subsystem maintainer
please add it when applying?

Long story: hi, this is your Linux kernel regression tracker speaking.
Thanks for working on a fix for a regression I'm keeping an eye on.

There is one small detail that could be improved: the commit message
would benefit from a link to the regression report, for reasons
explained in Documentation/process/submitting-patches.rst. To quote:

If related discussions or any other background information behind the
change can be found on the web, add 'Link:' tags pointing to it. In case
your patch fixes a bug, for example, add a tag with a URL referencing
the report in the mailing list archives or a bug tracker;

This concept is old, but the text was reworked recently to make this use
case for the Link: tag clearer. For details see:

Yes, that "Link:" is not really crucial; but it's good to have if
someone needs to look into the backstory of this change sometime in the
future. But I care for a different reason. I'm tracking this regression
(and others) with regzbot, my Linux kernel regression tracking bot. This
bot will notice if a patch with a Link: tag to a tracked regression gets
posted and record that, which allowed anyone looking into the regression
to quickly gasp the current status from regzbot's webui
( ) or its reports. The
bot will also notice if a commit with a Link: tag to a regression report
is applied by Linus and then automatically mark the regression as
resolved then.

IOW: this tag makes my life a regression tracker a lot easier, as I
otherwise have to tell regzbot manually about the fix. ;-)

Ciao, Thorsten (while carrying his Linux kernel regression tracker hat)

#regzbot ^backmonitor

  parent reply	other threads:[~2021-11-11  9:58 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-11  9:20 Javier Martinez Canillas
2021-11-11  9:54 ` Daniel Vetter
2021-11-11 11:18   ` Javier Martinez Canillas
2021-11-11  9:58 ` Thorsten Leemhuis [this message]
2021-11-11 10:00   ` Daniel Vetter
2021-11-11 10:25     ` Thorsten Leemhuis

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