linux-kernel - Re: 'current_state' is uninitialized in rbd_object_map_update

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Date:   Wed, 13 Nov 2019 12:21:10 +0100
From:   Ilya Dryomov <idryomov@...il.com>
To:     Tony Lu <tonylu@...ux.alibaba.com>
Cc:     linux-block <linux-block@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: 'current_state' is uninitialized in rbd_object_map_update_finish()

On Wed, Nov 13, 2019 at 2:35 AM Tony Lu <tonylu@...ux.alibaba.com> wrote:
>
> Hello,
>
> There is a warning during compiling driver rbd for uninitialized
> 'current state' in rbd_object_map_update_finish():
>
> drivers/block/rbd.c: In function 'rbd_object_map_callback':
> drivers/block/rbd.c:2122:21: warning: ‘current_state’ may be used uninitialized in this function [-Wmaybe-uninitialized]
>       (current_state == OBJECT_EXISTS && state == OBJECT_EXISTS_CLEAN))
>
> drivers/block/rbd.c:2090:23: note: ‘current_state’ was declared here
>   u8 state, new_state, current_state;
>                        ^~~~~~~~~~~~~

Hi Tony,

It looks like this warning was also reported by kbuild, on gcc 6.3 and
7.4.  It's bogus, I'll send a patch to silence it.

Thanks,

                Ilya