linux-kernel - Re: [PATCH] block: zoned: fix harmless maybe-uninitialized warning

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Message-ID: <yq11sz5b5tk.fsf@sermon.lab.mkp.net>
Date:   Mon, 24 Oct 2016 21:00:55 -0400
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Jens Axboe <axboe@...nel.dk>, Shaun Tancheff <shaun@...cheff.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Damien Le Moal <damien.lemoal@...t.com>,
        Hannes Reinecke <hare@...e.de>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] block: zoned: fix harmless maybe-uninitialized warning

>>>>> "Arnd" == Arnd Bergmann <arnd@...db.de> writes:

Arnd> The blkdev_report_zones produces a harmless warning when
Arnd> -Wmaybe-uninitialized is set, after gcc gets a little confused
Arnd> about the multiple 'goto' here:

Arnd> block/blk-zoned.c: In function 'blkdev_report_zones':
Arnd> block/blk-zoned.c:188:13: error: 'nz' may be used uninitialized in
Arnd> this function [-Werror=maybe-uninitialized]

Arnd> Moving the assignment to nr_zones makes this a little simpler
Arnd> while also avoiding the warning reliably. I'm removing the
Arnd> extraneous initialization of 'int ret' in the same patch, as that
Arnd> is semi-related and could cause an uninitialized use of that
Arnd> variable to not produce a warning.

Jens: Are you picking up Arnd's two fixes for the zoned code?

-- 
Martin K. Petersen	Oracle Linux Engineering