linux-kernel - Re: [for-next][PATCH 06/26] tools: bootconfig: Add bootconfig command

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Date:   Fri, 7 Feb 2020 22:39:23 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [for-next][PATCH 06/26] tools: bootconfig: Add bootconfig
 command

On Sat, 08 Feb 2020 00:02:04 +1100
Michael Ellerman <mpe@...erman.id.au> wrote:

> Steven Rostedt <rostedt@...dmis.org> writes:
> > From: Masami Hiramatsu <mhiramat@...nel.org>
> >
> > Add "bootconfig" command which operates the bootconfig
> > config-data on initrd image.
> >
> > User can add/delete/verify the boot config on initrd
> > image using this command.
> >
> > e.g.
> > Add a boot config to initrd image
> >  # bootconfig -a myboot.conf /boot/initrd.img
> >
> > Remove it.
> >  # bootconfig -d /boot/initrd.img
> >
> > Or verify (and show) it.
> >  # bootconfig /boot/initrd.img
> >
> > Link: http://lkml.kernel.org/r/157867223582.17873.14342161849213219982.stgit@devnote2
> >
> > Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
> > [ Removed extra blank line at end of bootconfig.c ]
> > Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
> > ---
> >  MAINTAINERS                                 |   1 +
> >  tools/Makefile                              |  11 +-
> >  tools/bootconfig/.gitignore                 |   1 +
> >  tools/bootconfig/Makefile                   |  20 ++
> >  tools/bootconfig/include/linux/bootconfig.h |   7 +
> >  tools/bootconfig/include/linux/bug.h        |  12 +
> >  tools/bootconfig/include/linux/ctype.h      |   7 +
> >  tools/bootconfig/include/linux/errno.h      |   7 +
> >  tools/bootconfig/include/linux/kernel.h     |  18 +
> >  tools/bootconfig/include/linux/printk.h     |  17 +
> >  tools/bootconfig/include/linux/string.h     |  32 ++
> >  tools/bootconfig/main.c                     | 353 ++++++++++++++++++++
> 
> This doesn't seem to build:
> 
>   $ cd tools/bootconfig
>   $ make
>   cc ../../lib/bootconfig.c main.c -Wall -g -I./include -o bootconfig
>   In file included from ./include/linux/kernel.h:8,
>                    from ../../lib/bootconfig.c:12:
>   ../../lib/bootconfig.c: In function ‘xbc_init’:
>   ./include/linux/printk.h:10:38: error: expected expression before ‘)’ token
>      10 |  (pr_output ? printf(fmt, __VA_ARGS__) : 0)
>         |                                      ^
>   ./include/linux/printk.h:12:16: note: in expansion of macro ‘printk’
>      12 | #define pr_err printk
>         |                ^~~~~~
>   ../../lib/bootconfig.c:740:3: note: in expansion of macro ‘pr_err’
>     740 |   pr_err("Error: bootconfig is already initialized.\n");
>         |   ^~~~~~
>   make: *** [Makefile:14: bootconfig] Error 1
> 
> 
> That's on Fedora 30, x86_64, but I see the same elsewhere.

Oops, thanks for reporting!
I found that the above macro doesn't work if the function gets 1 argument.
It should use ##__VA_ARGS__ instead of __VA_ARGS__.
OK, I'll fix it.

Thanks!


-- 
Masami Hiramatsu <mhiramat@...nel.org>