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From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Linux-Next Mailing List <linux-next@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Liang Lihao <lianglihao@huawei.com>
Subject: Re: linux-next: Signed-off-by missing for commit in the rcu tree
Date: Tue, 28 Nov 2017 17:14:29 -0800
Message-ID: <20171129011429.GB3624@linux.vnet.ibm.com> (raw)
In-Reply-To: <20171129115151.40b72764@canb.auug.org.au>

On Wed, Nov 29, 2017 at 11:51:51AM +1100, Stephen Rothwell wrote:
> Hi Paul,
> 
> Commit
> 
>   d7e182c9c324 ("rcu: Remove unnecessary spinlock in rcu_boot_init_percpu_data()")
> 
> is missing a Signed-off-by from its author.

Good catch, Stephen!

Lihao, would you please get me you Signed-off-by?  The patch is below.

							Thanx, Paul

------------------------------------------------------------------------

commit d7e182c9c32480c1f579dd888ac50e88bfb39596
Author: Liang Lihao <lianglihao@huawei.com>
Date:   Wed Nov 22 19:00:55 2017 +0000

    rcu: Remove unnecessary spinlock in rcu_boot_init_percpu_data()
    
    Since rcu_boot_init_percpu_data() is only called at boot time,
    there is no data race and spinlock is not needed.
    
    Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 69722817d6d6..0abe1db53d70 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3636,12 +3636,9 @@ static void rcu_init_new_rnp(struct rcu_node *rnp_leaf)
 static void __init
 rcu_boot_init_percpu_data(int cpu, struct rcu_state *rsp)
 {
-	unsigned long flags;
 	struct rcu_data *rdp = per_cpu_ptr(rsp->rda, cpu);
-	struct rcu_node *rnp = rcu_get_root(rsp);
 
 	/* Set up local state, ensuring consistent view of global state. */
-	raw_spin_lock_irqsave_rcu_node(rnp, flags);
 	rdp->grpmask = leaf_node_cpu_bit(rdp->mynode, cpu);
 	rdp->dynticks = &per_cpu(rcu_dynticks, cpu);
 	WARN_ON_ONCE(rdp->dynticks->dynticks_nesting != 1);
@@ -3649,7 +3646,6 @@ rcu_boot_init_percpu_data(int cpu, struct rcu_state *rsp)
 	rdp->cpu = cpu;
 	rdp->rsp = rsp;
 	rcu_boot_init_nocb_percpu_data(rdp);
-	raw_spin_unlock_irqrestore_rcu_node(rnp, flags);
 }
 
 /*

  reply index

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-11-29  0:51 Stephen Rothwell
2017-11-29  1:14 ` Paul E. McKenney [this message]
2017-11-29  2:48   ` Lihao Liang
2017-11-29  3:14     ` Hanjun Guo
2017-11-29  3:29       ` Lihao Liang
2017-11-29 20:54         ` Paul E. McKenney
  -- strict thread matches above, loose matches on Subject: below --
2019-10-28 20:53 Stephen Rothwell
2019-10-29  0:37 ` Paul E. McKenney
2018-04-23 21:48 Stephen Rothwell
2018-04-23 22:16 ` Paul E. McKenney
2018-02-26 22:38 Stephen Rothwell
2018-02-26 23:22 ` Paul E. McKenney
2017-07-30 13:48 Stephen Rothwell
2017-07-30 16:57 ` Paul E. McKenney

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