linux-kernel - Re: [PATCH] bonding:avoid repeated display of same link status change

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Message-Id: <20181102.233138.738200505012734856.davem@davemloft.net>
Date:   Fri, 02 Nov 2018 23:31:38 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     mk.singh@...cle.com
Cc:     netdev@...r.kernel.org, eric.dumazet@...il.com, mkubecek@...e.cz,
        j.vosburgh@...il.com, vfalico@...il.com, andy@...yhouse.net,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] bonding:avoid repeated display of same link status
 change

From: mk.singh@...cle.com
Date: Wed, 31 Oct 2018 16:27:28 +0530

> -			if (slave->delay) {
> +			if (slave->delay &&
> +			    !atomic64_read(&bond->rtnl_needed)) {
 ...
> +			    !atomic64_read(&bond->rtnl_needed)) {
 ...
> +			atomic64_set(&bond->rtnl_needed, 1);
 ...
> +		atomic64_set(&bond->rtnl_needed, 0);
 ...
> @@ -229,6 +229,7 @@ struct bonding {
>  	struct	 dentry *debug_dir;
>  #endif /* CONFIG_DEBUG_FS */
>  	struct rtnl_link_stats64 bond_stats;
> +	atomic64_t rtnl_needed;

There is nothing "atomic" about a value that is only set and read.

And using a full 64-bit value for something taking on only '0' and
'1' is unnecessary as well.