linux-kernel - Re: [PATCH] srcu: fix misprint in srcu_funnel_exp

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Message-Id: <20180130053708.GA3741@linux.vnet.ibm.com>
Date:   Mon, 29 Jan 2018 21:37:08 -0800
From:   "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:     Ildar Ismagilov <devix84@...il.com>
Cc:     Josh Triplett <josh@...htriplett.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] srcu: fix misprint in srcu_funnel_exp_start

On Mon, Jan 29, 2018 at 09:23:09PM +0300, Ildar Ismagilov wrote:
> Signed-off-by: Ildar Ismagilov <devix84@...il.com>

The original does look backwards, now that you mention it, thank you
for sending it.

Did you see any performance differences from this patch?

							Thanx, Paul

> ---
>  kernel/rcu/srcutree.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/rcu/srcutree.c b/kernel/rcu/srcutree.c
> index 6d5880089ff6..1798d1aa60fa 100644
> --- a/kernel/rcu/srcutree.c
> +++ b/kernel/rcu/srcutree.c
> @@ -599,7 +599,7 @@ static void srcu_funnel_exp_start(struct srcu_struct *sp, struct srcu_node *snp,
>  		raw_spin_unlock_irqrestore_rcu_node(snp, flags);
>  	}
>  	raw_spin_lock_irqsave_rcu_node(sp, flags);
> -	if (!ULONG_CMP_LT(sp->srcu_gp_seq_needed_exp, s))
> +	if (ULONG_CMP_LT(sp->srcu_gp_seq_needed_exp, s))
>  		sp->srcu_gp_seq_needed_exp = s;
>  	raw_spin_unlock_irqrestore_rcu_node(sp, flags);
>  }
> -- 
> 2.11.0
>