linux-kernel - Re: [PATCH 00/14] sched: Support shared runqueue locking

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Message-ID: <aMLhUJ9w7R-4HGny@gpd4>
Date: Thu, 11 Sep 2025 16:48:48 +0200
From: Andrea Righi <arighi@...dia.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: tj@...nel.org, linux-kernel@...r.kernel.org, mingo@...hat.com,
	juri.lelli@...hat.com, vincent.guittot@...aro.org,
	dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
	mgorman@...e.de, vschneid@...hat.com, longman@...hat.com,
	hannes@...xchg.org, mkoutny@...e.com, void@...ifault.com,
	changwoo@...lia.com, cgroups@...r.kernel.org,
	sched-ext@...ts.linux.dev, liuwenfang@...or.com, tglx@...utronix.de
Subject: Re: [PATCH 00/14] sched: Support shared runqueue locking

On Thu, Sep 11, 2025 at 04:30:00PM +0200, Peter Zijlstra wrote:
> On Thu, Sep 11, 2025 at 04:00:22PM +0200, Peter Zijlstra wrote:
> > On Wed, Sep 10, 2025 at 07:32:12PM +0200, Andrea Righi wrote:
> > 
> > > Reproducer:
> > > 
> > >  $ cd tools/sched_ext
> > >  $ make scx_simple
> > 
> > FWIW, I only have one machine where this works. Most of my machines this
> > results in an endless stream of build fail; same for the selftest stuff.
> > 
> > No clues given, just endless build fail :-(
> 
> Ah, I need to do: make O=/build-path/. The one machine it worked on had
> an actual test kernel installed and booted.

Maybe you need this?
https://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext.git/commit/?h=for-6.18&id=de68c05189cc4508c3ac4e1e44da1ddb16b1bceb

In case you're getting build failures with the likely() macro.

-Andrea