linux-kernel - Re: [PATCH v2 0/9] refcount: Improve code-gen

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Date:   Mon, 13 Dec 2021 17:11:49 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Marco Elver <elver@...gle.com>
Cc:     will@...nel.org, boqun.feng@...il.com,
        linux-kernel@...r.kernel.org, x86@...nel.org, mark.rutland@....com,
        keescook@...omium.org, hch@...radead.org,
        torvalds@...ux-foundation.org, axboe@...nel.dk, paulmck@...nel.org
Subject: Re: [PATCH v2 0/9] refcount: Improve code-gen

On Mon, Dec 13, 2021 at 03:42:34PM +0100, Marco Elver wrote:
> On Mon, Dec 13, 2021 at 01:20PM +0100, Peter Zijlstra wrote:
> > 
> > Also, since this will conflict most mighty with Marco's kcsan work in
> > the rcu tree, I've written the below patch as a replacement for the
> > instrumentation patch in that series.
> > 
> > It depends on other bits in that series so it cannot be applied here,
> > but will come in handy when trying to resolve the merge conflict.
> > 
> > ---
> > Subject: locking/atomics, kcsan: Add instrumentation for barriers
> > From: Peter Zijlstra <peterz@...radead.org>
> > Date: Thu Dec 9 17:08:16 CET 2021
> > 
> > Adds the required KCSAN instrumentation for barriers of atomics.
> > 
> > [adapted from https://lkml.kernel.org/r/20211130114433.2580590-17-elver@google.com]
> > Originally-by: Marco Elver <elver@...gle.com>
> > Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> 
> Thanks!
> 
> I wanted to test this, but can't quite figure out which branches I need
> to merge together to get it to apply. I assume -rcu + your series? Or
> the updated series not yet sent?

I think I applied the patches from your series up-to, but not including,
the atomic-instrument patch, then the first few patches of this posting
which cause the rejects and then this patch.

I've not attempted the actual git-merge or did much testing on the
results.