linux-kernel - Re: [PATCH -rcu dev 1/3] rcu/tree: tick_dep_set/clear

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Message-ID: <20190819123837.GC27088@lenoir>
Date:   Mon, 19 Aug 2019 14:38:38 +0200
From:   Frederic Weisbecker <frederic@...nel.org>
To:     "Joel Fernandes (Google)" <joel@...lfernandes.org>
Cc:     linux-kernel@...r.kernel.org, rcu@...r.kernel.org,
        "Paul E. McKenney" <paulmck@...ux.ibm.com>
Subject: Re: [PATCH -rcu dev 1/3] rcu/tree: tick_dep_set/clear_cpu should
 accept bits instead of masks

On Thu, Aug 15, 2019 at 10:53:09PM -0400, Joel Fernandes (Google) wrote:
> This commit fixes the issue.
> 
> Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>
> ---
>  kernel/rcu/tree.c | 29 +++++++++++++++++------------
>  1 file changed, 17 insertions(+), 12 deletions(-)
> 
> diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
> index 0512de9ead20..322b1b57967c 100644
> --- a/kernel/rcu/tree.c
> +++ b/kernel/rcu/tree.c
> @@ -829,7 +829,7 @@ static __always_inline void rcu_nmi_enter_common(bool irq)
>  		   !rdp->dynticks_nmi_nesting &&
>  		   rdp->rcu_urgent_qs && !rdp->rcu_forced_tick) {
>  		rdp->rcu_forced_tick = true;
> -		tick_dep_set_cpu(rdp->cpu, TICK_DEP_MASK_RCU);
> +		tick_dep_set_cpu(rdp->cpu, TICK_DEP_BIT_RCU);

Did I suggest you to use the _MASK_ value? That was a bit mean.
Sorry for all that lost debugging time :-(