Subject: Re: linux-next: build warning after merge of the device-mapper tree

From: yangerkun <[email-masked]>
Date: Thu, 9 Jul 2020 12:38:30 +0800

在 2020/7/9 11:26, Stephen Rothwell 写道:
> Hi all,
> 
> After merging the device-mapper tree, today's linux-next build (x86_64
> allmodconfig) produced this warning:
> 
> In file included from drivers/md/dm-dust.c:11:
> drivers/md/dm-dust.c: In function 'dust_list_badblocks':
> drivers/md/dm-dust.c:307:10: warning: zero-length gnu_printf format string [-Wformat-zero-length]
>    307 |   DMEMIT("");
Mike and Bryan,

Should we just use "DMEMIT("\n")"? Maybe it's bad since this lead a
blank line...

>        |          ^~
> include/linux/device-mapper.h:555:46: note: in definition of macro 'DMEMIT'
>    555 |      0 : scnprintf(result + sz, maxlen - sz, x))
>        |                                              ^
> 
> Introduced by commit
> 
>    20f93ea74f9c ("dm dust: add interface to list all badblocks")
>