linux-kernel - Re: Contextual conflict between kspp and rcu trees

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Message-ID: <YqpCkAVTwpNn+6p9@dev-arch.thelio-3990X>
Date:   Wed, 15 Jun 2022 13:35:28 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Sami Tolvanen <samitolvanen@...gle.com>, llvm@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-next@...r.kernel.org
Subject: Re: Contextual conflict between kspp and rcu trees

On Wed, Jun 15, 2022 at 01:28:00PM -0700, Kees Cook wrote:
> On Wed, Jun 15, 2022 at 12:55:53PM -0700, Nathan Chancellor wrote:
> > Per the above RCU commit and commit 6c5218715286 ("context_tracking:
> > Take IRQ eqs entrypoints over RCU"), it appears that the following diff
> > is the proper fix up. Would you mind applying it to the merge of
> > whichever tree comes second if possible? I did build and boot test it
> > but it would not be a bad idea for Sami and Frederic to verify that it
> > is correct so that Kees/Paul can mention it to Linus :)
> 
> Actually, the CFI fix (and a few others) are meant to be sent for
> -rc3, so if the ct_irq_enter() change is in -next, this can maybe get
> sorted out?

Ah, I had assumed that branch was destined for the next release. If it
is for 5.19 and they make -rc3 then it should be trivial for Paul to
either rebase the changes on -rc3 and apply that diff as part of
"context_tracking: Take IRQ eqs entrypoints over RCU" (if his tree is
mutable) or just merge -rc3 and apply that diff as part of the merge. I
don't really care how it gets resolved, just so long as it does :)

Cheers,
Nathan