linux-kernel - Re: [PATCH 05/19] context_tracking: Split user tracking Kconfig

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Date:   Fri, 11 Mar 2022 16:49:44 +0100
From:   Frederic Weisbecker <frederic@...nel.org>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Phil Auld <pauld@...hat.com>,
        Alex Belits <abelits@...vell.com>,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Xiongfeng Wang <wangxiongfeng2@...wei.com>,
        Neeraj Upadhyay <quic_neeraju@...cinc.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Yu Liao <liaoyu15@...wei.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Marcelo Tosatti <mtosatti@...hat.com>,
        Paul Gortmaker <paul.gortmaker@...driver.com>,
        Uladzislau Rezki <uladzislau.rezki@...y.com>,
        Joel Fernandes <joel@...lfernandes.org>
Subject: Re: [PATCH 05/19] context_tracking: Split user tracking Kconfig

On Thu, Mar 10, 2022 at 11:43:46AM -0800, Paul E. McKenney wrote:
> On Wed, Mar 02, 2022 at 04:47:56PM +0100, Frederic Weisbecker wrote:
> > Context tracking is going to be used not only to track user transitions
> > but also idle/IRQs/NMIs. The user tracking part will then become a
> > seperate feature. Prepare Kconfig for that.
> 
> s/seperate/separate/ # nit

Thanks, of course I'm never sure about that one.

> > diff --git a/arch/Kconfig b/arch/Kconfig
> > index 678a80713b21..1a3b79cfc9e3 100644
> > --- a/arch/Kconfig
> > +++ b/arch/Kconfig
> > @@ -762,7 +762,7 @@ config HAVE_ARCH_WITHIN_STACK_FRAMES
> >  	  and similar) by implementing an inline arch_within_stack_frames(),
> >  	  which is used by CONFIG_HARDENED_USERCOPY.
> >  
> > -config HAVE_CONTEXT_TRACKING
> > +config HAVE_CONTEXT_TRACKING_USER
> 
> Just checking...  This means that only some configs will see userland
> execution as being different than kernel execution, correct?  (Which
> is the case today, to be fair.)

Exactly!

Thanks!