linux-kernel - Re: [PATCH] nvme: fix uninitialized-variable warning

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Date:   Thu, 30 Jan 2020 07:48:15 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        Oleksandr Natalenko <oleksandr@...hat.com>,
        Bart Van Assche <bvanassche@....org>,
        Chaitanya Kulkarni <chaitanya.kulkarni@....com>,
        Marta Rybczynska <mrybczyn@...ray.eu>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-nvme@...ts.infradead.org, Hannes Reinecke <hare@...e.de>
Subject: Re: [PATCH] nvme: fix uninitialized-variable warning

On Thu, Jan 30, 2020 at 04:36:48PM +0100, Arnd Bergmann wrote:
> > This one is just gross.  I think we'll need to find some other fix
> > that doesn't obsfucate the code as much.
> 
> Initializing the nvme_result in nvme_features() would do it, as would
> setting it in the error path in __nvme_submit_sync_cmd() -- either
> way the compiler cannot be confused about whether it is initialized
> later on.

Given that this is outside the hot path we can just zero the whole
structure before submitting the I/O.