netdev - Re: [PATCH] net/xdp: remove unused macro REG_STATE

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Date:   Sat, 7 Nov 2020 21:08:12 +0800
From:   Alex Shi <alex.shi@...ux.alibaba.com>
To:     Jesper Dangaard Brouer <jbrouer@...hat.com>
Cc:     davem@...emloft.net, Jakub Kicinski <kuba@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net/xdp: remove unused macro REG_STATE_NEW



在 2020/11/7 上午12:13, Jesper Dangaard Brouer 写道:
> Hmm... REG_STATE_NEW is zero, so it is implicitly set via memset zero.
> But it is true that it is technically not directly used or referenced.
> 
> It is mentioned in a comment, so please send V2 with this additional change:

Hi Jesper,

Thanks a lot for comments. here is the v2:

>From 2908d25bf2e1c90ad71a83ba056743f45da283e8 Mon Sep 17 00:00:00 2001
From: Alex Shi <alex.shi@...ux.alibaba.com>
Date: Fri, 6 Nov 2020 13:41:58 +0800
Subject: [PATCH v2] net/xdp: remove unused macro REG_STATE_NEW

To tame gcc warning on it:
net/core/xdp.c:20:0: warning: macro "REG_STATE_NEW" is not used
[-Wunused-macros]
And change related comments as Jesper Dangaard Brouer suggested.

Signed-off-by: Alex Shi <alex.shi@...ux.alibaba.com>
---
 net/core/xdp.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/net/core/xdp.c b/net/core/xdp.c
index 48aba933a5a8..0df5ee5682d9 100644
--- a/net/core/xdp.c
+++ b/net/core/xdp.c
@@ -19,7 +19,6 @@
 #include <trace/events/xdp.h>
 #include <net/xdp_sock_drv.h>
 
-#define REG_STATE_NEW		0x0
 #define REG_STATE_REGISTERED	0x1
 #define REG_STATE_UNREGISTERED	0x2
 #define REG_STATE_UNUSED	0x3
@@ -175,7 +174,7 @@ int xdp_rxq_info_reg(struct xdp_rxq_info *xdp_rxq,
 		return -ENODEV;
 	}
 
-	/* State either UNREGISTERED or NEW */
+	/* State either UNREGISTERED or zero */
 	xdp_rxq_info_init(xdp_rxq);
 	xdp_rxq->dev = dev;
 	xdp_rxq->queue_index = queue_index;
-- 
1.8.3.1