linux-kernel - Re: [PATCH 2/6] ARM: xen: Register with kernel restart handler

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Message-ID: <20210603141005.GV30436@shell.armlinux.org.uk>
Date:   Thu, 3 Jun 2021 15:10:05 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Thierry Reding <thierry.reding@...il.com>, arm@...nel.org,
        Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
        Stefan Agner <stefan@...er.ch>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>,
        Stefano Stabellini <sstabellini@...nel.org>
Subject: Re: [PATCH 2/6] ARM: xen: Register with kernel restart handler

On Thu, Jun 03, 2021 at 03:03:01PM +0100, Lee Jones wrote:
> On Thu, 03 Jun 2021, Russell King (Oracle) wrote:
> 
> > On Thu, Jun 03, 2021 at 09:48:59AM -0400, Boris Ostrovsky wrote:
> > > On 6/3/21 9:38 AM, Lee Jones wrote:
> > > > On Thu, 03 Jun 2021, Guenter Roeck wrote:
> > > >
> > > >> On Thu, Jun 03, 2021 at 01:43:36PM +0100, Lee Jones wrote:
> > > >>> On Tue, 15 Oct 2019 at 15:52, Thierry Reding <thierry.reding@...il.com>
> > > >>> wrote:
> > > >>>
> > > >>>> From: Guenter Roeck <linux@...ck-us.net>
> > > >>>>
> > > >>>> Register with kernel restart handler instead of setting arm_pm_restart
> > > >>>> directly.
> > > >>>>
> > > >>>> Select a high priority of 192 to ensure that default restart handlers
> > > >>>> are replaced if Xen is running.
> > > >>>>
> > > >>>> Acked-by: Arnd Bergmann <arnd@...db.de>
> > > >>>> Reviewed-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
> > > >>>> Reviewed-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
> > > >>>> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> > > >>>> Signed-off-by: Thierry Reding <treding@...dia.com>
> > > >>>> ---
> > > >>>>  arch/arm/xen/enlighten.c | 12 ++++++++++--
> > > >>>>  1 file changed, 10 insertions(+), 2 deletions(-)
> > > >>>>
> > > >>> This patch does appear to be useful.
> > > >>>
> > > >>> Is this just being solved in downstream trees at the moment?
> > > >>>
> > > >>> It would be nice if we could relinquish people of this burden and get it
> > > >>> into Mainline finally.
> > > >>>
> > > >> There must have been half a dozen attempts to send this patch series
> > > >> upstream. I have tried, and others have tried. Each attempt failed with
> > > >> someone else objecting for non-technical reasons (such as "we need more
> > > >> reviews") or no reaction at all, and maintainers just don't pick it up.
> > > > Looking at the *-by tag list above, I think we have enough quality
> > > > reviews to take this forward.
> > > >
> > > >> So, yes, this patch series can only be found in downstream trees,
> > > >> and it seems pointless to submit it yet again.
> > > > IMHO, it's unfair to burden multiple downstream trees with this purely
> > > > due to poor or nervy maintainership.  Functionality as broadly useful
> > > > as this should be merged and maintained in Mainline.
> > > >
> > > > OOI, who is blocking?  As I see it, we have 2 of the key maintainers
> > > > in the *-by list.  With those on-board, it's difficult to envisage
> > > > what the problem is.
> > > 
> > > 
> > > Stefano (who is ARM Xen maintainer) left Citrix a while ago. He is at sstabellini@...nel.org (which I added to the CC line).
> > 
> > Stefano already reviewed this patch, which is part of a larger series
> > that primarily touches 32-bit ARM code, but also touches 64-bit ARM
> > code as well.
> > 
> > As I said in my previous reply, I don't see that there's any problem
> > with getting these patches merged had the usual processes been
> > followed - either ending up in the patch system, or the pull request
> > being sent to me directly.
> > 
> > Sadly, the pull request was sent to the arm-soc people excluding me,
> > I happened to notice it and requested to see the patches that were
> > being asked to be pulled (since I probably couldn't find them)...
> > and it then took two further weeks before the patches were posted,
> > which I then missed amongst all the other email.
> > 
> > It's a process failure and unfortunate timing rather than anything
> > malicious.
> 
> Understood.
> 
> Is there anything I can do to help this forward?
> 
> I can either collect and re-submit the patches to the MLs if that
> makes people's lives any easier.  Or if one of the original submitters
> wish to retain responsibility, I have no qualms with that either.

I think at this point the usual applies - to make sure that they still
apply to current kernels and don't cause any regressions. I would hope
there won't be anything significant to invalidate the reviews already
given. If that's the case, it should just be a matter of someone
putting them in the patch system or send me a pull request.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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