linux-kernel - Re: [PATCH v4 7/8] lockdep: Change hardirq{s_enabled,

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Message-ID: <20200624151814.GI4781@hirez.programming.kicks-ass.net>
Date:   Wed, 24 Jun 2020 17:18:14 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Marco Elver <elver@...gle.com>
Cc:     "Ahmed S. Darwish" <a.darwish@...utronix.de>, mingo@...nel.org,
        will@...nel.org, tglx@...utronix.de, x86@...nel.org,
        linux-kernel@...r.kernel.org, rostedt@...dmis.org,
        bigeasy@...utronix.de, davem@...emloft.net,
        sparclinux@...r.kernel.org, mpe@...erman.id.au,
        linuxppc-dev@...ts.ozlabs.org, heiko.carstens@...ibm.com,
        linux-s390@...r.kernel.org, linux@...linux.org.uk,
        paulmck@...nel.org
Subject: Re: [PATCH v4 7/8] lockdep: Change hardirq{s_enabled,_context} to
 per-cpu variables

On Wed, Jun 24, 2020 at 01:32:46PM +0200, Marco Elver wrote:
> From: Marco Elver <elver@...gle.com>
> Date: Wed, 24 Jun 2020 11:23:22 +0200
> Subject: [PATCH] kcsan: Make KCSAN compatible with new IRQ state tracking
> 
> The new IRQ state tracking code does not honor lockdep_off(), and as
> such we should again permit tracing by using non-raw functions in
> core.c. Update the lockdep_off() comment in report.c, to reflect the
> fact there is still a potential risk of deadlock due to using printk()
> from scheduler code.
> 
> Suggested-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> Signed-off-by: Marco Elver <elver@...gle.com>

Thanks!

I've put this in front of the series at hand. I'll wait a little while
longer for arch people to give feedback on their header patches before I
stuff the lot into tip/locking/core.