linux-kernel - Re: [PATCH] s390/idle: Fix suspicious RCU usage

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Message-ID: <20200908134144.GH14136@osiris>
Date:   Tue, 8 Sep 2020 15:41:44 +0200
From:   Heiko Carstens <hca@...ux.ibm.com>
To:     peterz@...radead.org
Cc:     linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
        rafael.j.wysocki@...el.com, svens@...ux.ibm.com
Subject: Re: [PATCH] s390/idle: Fix suspicious RCU usage

On Tue, Sep 08, 2020 at 03:30:31PM +0200, peterz@...radead.org wrote:
> 
> After commit eb1f00237aca ("lockdep,trace: Expose tracepoints") the
> lock tracepoints are visible to lockdep and RCU-lockdep is finding a
> bunch more RCU violations that were previously hidden.
> 
> Switch the idle->seqcount over to using raw_write_*() to avoid the
> lockdep annotation and thus the lock tracepoints.
> 
> Reported-by: Guenter Roeck <linux@...ck-us.net>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> ---
>  arch/s390/kernel/idle.c |    5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)

Applied, thank you!