Re: [PATCH] nbd: add missing definition of pr_fmt

[Yu Kuai <yukuai3@huawei.com>]

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@huawei.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
> 
> .
>