linux-kernel - Re: [PATCH 0/3] A few minor fw

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Message-ID: <CAGETcx_BD_G3oOHvT7aRr98Ag7-XvrMX=NW_wm9Cx9M5+qr-aw@mail.gmail.com>
Date: Thu, 24 Oct 2024 09:45:10 -0700
From: Saravana Kannan <saravanak@...gle.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
	JC Kuo <jckuo@...dia.com>, Vinod Koul <vkoul@...nel.org>, 
	Kishon Vijay Abraham I <kishon@...nel.org>, Thierry Reding <thierry.reding@...il.com>, 
	Jonathan Hunter <jonathanh@...dia.com>, Matthias Brugger <matthias.bgg@...il.com>, 
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
	Nícolas F. R. A. Prado <nfraprado@...labora.com>, 
	kernel-team@...roid.com, linux-kernel@...r.kernel.org, 
	dri-devel@...ts.freedesktop.org, linux-phy@...ts.infradead.org, 
	linux-tegra@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 0/3] A few minor fw_devlink fixes

On Thu, Oct 24, 2024 at 12:08 AM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> On Wed, Oct 23, 2024 at 11:13:41PM -0700, Saravana Kannan wrote:
> > Probably easiest for Greg to pull in these changes?
> >
> > PSA: Do not pull any of these patches into stable kernels. fw_devlink
> > had a lot of changes that landed in the last year. It's hard to ensure
> > cherry-picks have picked up all the dependencies correctly. If any of
> > these really need to get cherry-picked into stable kernels, cc me and
> > wait for my explicit Ack.
>
> You can do that with the correct tag in the commit as per the stable
> documentation if you really want to :)
>
> But why would these not be able to go backwards?  What changed to
> require them now and not be ok for older kernels?

Depending on how far back we go in terms of kernel version, it'd be a
bunch of cycle detection logic, deferred probe behavior change, etc.
And those patches might have other dependencies themselves, etc.

He's one example of such a breakage:
https://lore.kernel.org/all/20241024-fixup-5-15-v1-1-74d360bd3002@mediatek.com/

-Saravana