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Message-ID: <4e6a80cb-63fa-660c-8acf-f25062800238@huawei.com>
Date: Sat, 23 Jul 2022 10:14:30 +0800
From: Yu Kuai <yukuai3@...wei.com>
To: Yu Kuai <yukuai1@...weicloud.com>, Joe Perches <joe@...ches.com>,
<josef@...icpanda.com>, <axboe@...nel.dk>, <houtao1@...wei.com>
CC: <linux-block@...r.kernel.org>, <nbd@...er.debian.org>,
<linux-kernel@...r.kernel.org>, <yi.zhang@...wei.com>
Subject: Re: [PATCH] nbd: add missing definition of pr_fmt
Hi!
在 2022/07/20 19:46, Yu Kuai 写道:
> Hi !
>
> 在 2022/07/18 22:32, Joe Perches 写道:
>> On Mon, 2022-07-18 at 21:52 +0800, Yu Kuai wrote:
>>> 在 2022/07/06 17:33, Yu Kuai 写道:
>>>> From: Yu Kuai <yukuai3@...wei.com>
>>>>
>>>> commit 1243172d5894 ("nbd: use pr_err to output error message") tries
>>>> to define pr_fmt and use short pr_err() to output error message,
>>>> however, the definition is missed.
>>> friendly ping ...
>> []
>>>> diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
>> []
>>>> @@ -44,6 +44,9 @@
>>>> #include <linux/nbd-netlink.h>
>>>> #include <net/genetlink.h>
>>>> +#undef pr_fmt
>>>> +#define pr_fmt(fmt) "nbd: " fmt
>>>> +
I tried to remove the #undef:
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -44,7 +44,6 @@
#include <linux/nbd-netlink.h>
#include <net/genetlink.h>
#define pr_fmt(fmt) "nbd: " fmt
And then following warning is triggered:
drivers/block/nbd.c:47: warning: "pr_fmt" redefined
47 | #define pr_fmt(fmt) "nbd: " fmt
It semms that keeping that #undef is the right thing to do.
Thanks,
Kuai
>> Typically, this #define is place before all #include lines
>> so there is no need for an #undef
>
> Thanks for you advice, I'll do that in v2.
>
> Kuai
>
> .
>
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