linux-kernel - [PATCH] net: core: Modify alloc_size in alloc_netdev

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Message-Id: <20210630051118.2212-1-yajun.deng@linux.dev>
Date:   Wed, 30 Jun 2021 13:11:18 +0800
From:   Yajun Deng <yajun.deng@...ux.dev>
To:     davem@...emloft.net, kuba@...nel.org, andriin@...com,
        atenart@...nel.org, alobakin@...me, ast@...nel.org,
        edumazet@...gle.com, daniel@...earbox.net, weiwan@...gle.com,
        ap420073@...il.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Yajun Deng <yajun.deng@...ux.dev>
Subject: [PATCH] net: core: Modify alloc_size in alloc_netdev_mqs()

Use ALIGN for 'struct net_device', and remove the unneeded
'NETDEV_ALIGN - 1'. This can save a few bytes. and modify
the pr_err content when txqs < 1.

Signed-off-by: Yajun Deng <yajun.deng@...ux.dev>
---
 net/core/dev.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index c253c2aafe97..c42a682a624d 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -10789,7 +10789,7 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
 	BUG_ON(strlen(name) >= sizeof(dev->name));
 
 	if (txqs < 1) {
-		pr_err("alloc_netdev: Unable to allocate device with zero queues\n");
+		pr_err("alloc_netdev: Unable to allocate device with zero TX queues\n");
 		return NULL;
 	}
 
@@ -10798,14 +10798,12 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
 		return NULL;
 	}
 
-	alloc_size = sizeof(struct net_device);
+	/* ensure 32-byte alignment of struct net_device*/
+	alloc_size = ALIGN(sizeof(struct net_device), NETDEV_ALIGN);
 	if (sizeof_priv) {
 		/* ensure 32-byte alignment of private area */
-		alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
-		alloc_size += sizeof_priv;
+		alloc_size += ALIGN(sizeof_priv, NETDEV_ALIGN);
 	}
-	/* ensure 32-byte alignment of whole construct */
-	alloc_size += NETDEV_ALIGN - 1;
 
 	p = kvzalloc(alloc_size, GFP_KERNEL | __GFP_RETRY_MAYFAIL);
 	if (!p)
-- 
2.32.0