linux-kernel - Re: [PATCH 1/2] net/mlx5e: shut up maybe-uninitialized warning

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Message-Id: <20161003.015601.1695276307529816567.davem@davemloft.net>
Date:   Mon, 03 Oct 2016 01:56:01 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     arnd@...db.de
Cc:     saeedm@...lanox.com, matanb@...lanox.com, leonro@...lanox.com,
        ogerlitz@...lanox.com, amirva@...lanox.com, maorg@...lanox.com,
        netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] net/mlx5e: shut up maybe-uninitialized warning

From: Arnd Bergmann <arnd@...db.de>
Date: Fri, 30 Sep 2016 18:17:09 +0200

> Build-testing this driver with -Wmaybe-uninitialized gives a new false-positive
> warning that I can't really explain:
> 
> drivers/net/ethernet/mellanox/mlx5/core/en_tc.c: In function 'mlx5e_configure_flower':
> drivers/net/ethernet/mellanox/mlx5/core/en_tc.c:509:3: error: 'old_attr' may be used uninitialized in this function [-Werror=maybe-uninitialized]
> 
> It's obvious from the code that 'old_attr' is initialized whenever 'old'
> is non-NULL here. The warning appears with all versions I tested from gcc-4.7
> through gcc-6.1, and I could not come up with a way to rewrite the function
> in a more readable way that avoids the warning, so I'm adding another
> initialization to shut it up.
> 
> Fixes: 8b32580df1cb ("net/mlx5e: Add TC vlan action for SRIOV offloads")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Applied.