linux-kernel - [PATCH v4 2/3] kernel/notifier.c: remove notifier_chain_cond

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Message-ID: <1568861888-34045-3-git-send-email-nixiaoming@huawei.com>
Date:   Thu, 19 Sep 2019 10:58:07 +0800
From:   Xiaoming Ni <nixiaoming@...wei.com>
To:     <gregkh@...uxfoundation.org>, <akpm@...ux-foundation.org>,
        <vvs@...tuozzo.com>, <torvalds@...ux-foundation.org>,
        <adobriyan@...il.com>, <anna.schumaker@...app.com>,
        <arjan@...ux.intel.com>, <bfields@...ldses.org>,
        <chuck.lever@...cle.com>, <davem@...emloft.net>,
        <jlayton@...nel.org>, <luto@...nel.org>, <mingo@...nel.org>,
        <Nadia.Derbey@...l.net>, <paulmck@...ux.vnet.ibm.com>,
        <semen.protsenko@...aro.org>, <stern@...land.harvard.edu>,
        <tglx@...utronix.de>, <trond.myklebust@...merspace.com>,
        <viresh.kumar@...aro.org>
CC:     <stable@...nel.org>, <dylix.dailei@...wei.com>,
        <nixiaoming@...wei.com>, <yuehaibing@...wei.com>,
        <linux-kernel@...r.kernel.org>, <linux-nfs@...r.kernel.org>,
        <netdev@...r.kernel.org>
Subject: [PATCH v4 2/3] kernel/notifier.c: remove notifier_chain_cond_register()

The only difference between notifier_chain_cond_register() and
notifier_chain_register() is the lack of warning hints for duplicate
registrations.
Consider using notifier_chain_register() instead of
notifier_chain_cond_register() to avoid duplicate code

Signed-off-by: Xiaoming Ni <nixiaoming@...wei.com>
---
 kernel/notifier.c | 17 +----------------
 1 file changed, 1 insertion(+), 16 deletions(-)

diff --git a/kernel/notifier.c b/kernel/notifier.c
index 30bedb8..e3d221f 100644
--- a/kernel/notifier.c
+++ b/kernel/notifier.c
@@ -36,21 +36,6 @@ static int notifier_chain_register(struct notifier_block **nl,
 	return 0;
 }
 
-static int notifier_chain_cond_register(struct notifier_block **nl,
-		struct notifier_block *n)
-{
-	while ((*nl) != NULL) {
-		if ((*nl) == n)
-			return 0;
-		if (n->priority > (*nl)->priority)
-			break;
-		nl = &((*nl)->next);
-	}
-	n->next = *nl;
-	rcu_assign_pointer(*nl, n);
-	return 0;
-}
-
 static int notifier_chain_unregister(struct notifier_block **nl,
 		struct notifier_block *n)
 {
@@ -252,7 +237,7 @@ int blocking_notifier_chain_cond_register(struct blocking_notifier_head *nh,
 	int ret;
 
 	down_write(&nh->rwsem);
-	ret = notifier_chain_cond_register(&nh->head, n);
+	ret = notifier_chain_register(&nh->head, n);
 	up_write(&nh->rwsem);
 	return ret;
 }
-- 
1.8.5.6