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Date:   Tue, 31 Mar 2020 17:57:08 +0200
From:   Peter Zijlstra <peterz@infradead.org>
To:     Marcelo Tosatti <mtosatti@redhat.com>
Cc:     linux-kernel@vger.kernel.org,
        Frederic Weisbecker <fweisbec@gmail.com>,
        Chris Friesen <chris.friesen@windriver.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Andrew Morton <akpm@linux-foundation.org>,
        Jim Somerville <Jim.Somerville@windriver.com>,
        Christoph Lameter <cl@linux.com>
Subject: Re: [patch 3/3] isolcpus: undeprecate on documentation
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On Tue, Mar 31, 2020 at 12:41:46PM -0300, Marcelo Tosatti wrote:
> On Tue, Mar 31, 2020 at 05:22:17PM +0200, Peter Zijlstra wrote:
> > On Sat, Mar 28, 2020 at 12:21:20PM -0300, Marcelo Tosatti wrote:
> > > isolcpus is used to control steering of interrupts to managed_irqs and
> > > kernel threads, therefore its incorrect to state that its deprecated.
> > > 
> > > Remove deprecation warning.
> > > 
> > > Suggested-by: Chris Friesen <chris.friesen@windriver.com>
> > > Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
> > > 
> > > ---
> > >  Documentation/admin-guide/kernel-parameters.txt |    1 -
> > >  1 file changed, 1 deletion(-)
> > > 
> > > Index: linux-2.6/Documentation/admin-guide/kernel-parameters.txt
> > > ===================================================================
> > > --- linux-2.6.orig/Documentation/admin-guide/kernel-parameters.txt
> > > +++ linux-2.6/Documentation/admin-guide/kernel-parameters.txt
> > > @@ -1926,7 +1926,6 @@
> > >  			Format: <RDP>,<reset>,<pci_scan>,<verbosity>
> > >  
> > >  	isolcpus=	[KNL,SMP,ISOL] Isolate a given set of CPUs from disturbance.
> > > -			[Deprecated - use cpusets instead]
> > >  			Format: [flag-list,]<cpu-list>
> > >  
> > 
> > It's still an absolute horrible piece of crap though. nozh_full piling
> > more and more shit on it doesn't make it more shiny.
> 
> Hi Peter,
> 
> Why do you dislike it? What you think would be a decent approach?

Try and reconfigure it after boot.