linux-kernel - Re: [PATCH] x86: UV: raw

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Message-ID: <1526982375.6491.3.camel@gmx.de>
Date:   Tue, 22 May 2018 11:46:15 +0200
From:   Mike Galbraith <gleep@....de>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
        x86@...nel.org
Subject: Re: [PATCH] x86: UV: raw_spinlock conversion

On Tue, 2018-05-22 at 11:14 +0200, Sebastian Andrzej Siewior wrote:
> On 2018-05-22 10:24:22 [+0200], Mike Galbraith wrote:
> 
> > If I were in your shoes, I think I'd just stop caring about UV until a
> > real user appears.  AFAIK, I'm the only guy who ever ran RT on UV, and
> > I only did so because SUSE asked me to look into it.. years ago now.
> 
> Okay. The problem I have with this patch is that it remains RT only
> while the problem it addresses is not RT-only and PREEMPT kernels are
> very much affected.

Ah, but when RT gets merged (someday... maybe), that patch will apply,
and instantly make all.. zero.. UV-RT users happy campers :)

> The thing is that *you* are my only UV user :)

Crash-test-dummies don't really qualify as users :)

>  If you suggest that I
> should stop caring about UV than I do so. Please post a patch that adds
> a dependency to UV on PREEMPT so that part of the architecture is
> documented.

Will do.

	-Mike