linux-kernel - Re: [PATCH v4] irqchip: gic: Allow gic_arch

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Date:	Sun, 17 Aug 2014 22:18:59 -0400 (EDT)
From:	Nicolas Pitre <nicolas.pitre@...aro.org>
To:	Jason Cooper <jason@...edaemon.net>
cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Stephen Boyd <sboyd@...eaurora.org>,
	linux-arm-msm@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4] irqchip: gic: Allow gic_arch_extn hooks to call into
 scheduler

On Sun, 17 Aug 2014, Jason Cooper wrote:

> On Sun, Aug 17, 2014 at 09:35:11PM -0400, Nicolas Pitre wrote:
> > On Sun, 17 Aug 2014, Jason Cooper wrote:
> > 
> > > On Sun, Aug 17, 2014 at 08:04:45PM -0400, Nicolas Pitre wrote:
> > > > On Sun, 17 Aug 2014, Jason Cooper wrote:
> > > > > On Sun, Aug 17, 2014 at 07:55:23PM +0100, Russell King - ARM Linux wrote:
> > > > > > On Sun, Aug 17, 2014 at 01:32:36PM -0400, Jason Cooper wrote:
> > > > > > > Applied to irqchip/urgent with Nico's Ack.
> > > > > > 
> > > > > > Interesting, so I'm discussing this patch, and it gets applied anyway...
> > > > > > yes, that's great.
> > > > > 
> > > > > Quoting Nico:
> > > > > 
> > > > > "Of course it would be good to clarify things wrt Russell's remark
> > > > > independently from this patch."
> > > > > 
> > > > > I took 'independently' to mean "This patch is ok, *and* we need to
> > > > > address Russell's concerns in a follow-up patch."
> > > > > 
> > > > > Nico's Reviewed-by with that comment was sent August 13th.  The most
> > > > > recent activity on this thread was also August 13th.  After four days, I
> > > > > reasoned there were no objections to his comment.
> > > > 
> > > > Well... I mentioned this patch is a nice cleanup independently of the 
> > > > reason why it was created in the first place.
> > > 
> > > Ah, fair enough.
> > > 
> > > > Maybe that shouldn't be sorted as "urgent" in that case, especially
> > > > when the code having problem with the current state of things is
> > > > living out of mainline.
> > > 
> > > hmmm, yes.  I've been grappling with the semantics of '/urgent' vice
> > > '/fixes'.  With mvebu, /fixes is the branch for all changes needing to go
> > > into the current -rcX cycle.  For irqchip, Thomas suggested /urgent for
> > > the equivalent branch.  To me, they serve the same purpose.
> > > Unfortunately, I occasionally hear "Well, it's not _urgent_ ...".  I
> > > suppose I'll put up with it for one more cycle and then change it to
> > > /fixes. :)
> > > 
> > > wrt this patch, I need to drop it anyway.  I was a bit rusty (it's been
> > > a few weeks) and forgot to add the Cc -stable and Fixes: tags.  I do
> > > agree, though, it's certainly not urgent.
> > 
> > Given the raised issue has to do with out-of-tree code, there is no need 
> > to CC stable in that case anyway.
> 
> I could go either way here.  On the one hand, a fix is a fix is a fix.
> On the other, if it can't be triggered in mainline, we shouldn't accept
> it at all.

For mainline, it should be accepted as a cleanup and minor optimization 
since no mainline code is currently affected by the absence of this 
patch.

If there is a real bug being fixed by this patch, and whether the best 
way to fix it is by relying on this patch, is still up for debate.

> Stephen, is the out of tree code that triggered this bound for mainline?

Maybe "mainline", but certainly not "stable".


Nicolas
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