netdev - Re: [PATCH] [v2] net/mlx5e: reduce stack usage in mlx5_eswitch_termtbl

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Date:   Tue, 18 Jun 2019 20:05:56 +0000
From:   Saeed Mahameed <saeedm@...lanox.com>
To:     "arnd@...db.de" <arnd@...db.de>,
        "leon@...nel.org" <leon@...nel.org>
CC:     "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        Or Gerlitz <ogerlitz@...lanox.com>,
        Oz Shlomo <ozsh@...lanox.com>,
        Paul Blakey <paulb@...lanox.com>,
        Mark Bloch <markb@...lanox.com>,
        Maor Gottlieb <maorg@...lanox.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        Eli Britstein <elibr@...lanox.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH] [v2] net/mlx5e: reduce stack usage in
 mlx5_eswitch_termtbl_create

On Tue, 2019-06-18 at 13:15 +0200, Arnd Bergmann wrote:
> Putting an empty 'mlx5_flow_spec' structure on the stack is a bit
> wasteful and causes a warning on 32-bit architectures when building
> with clang -fsanitize-coverage:
> 
> drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads_termtbl.c:
> In function 'mlx5_eswitch_termtbl_create':
> drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads_termtbl.c:90
> :1: error: the frame size of 1032 bytes is larger than 1024 bytes [-
> Werror=frame-larger-than=]
> 
> Since the structure is never written to, we can statically allocate
> it to avoid the stack usage. To be on the safe side, mark all
> subsequent function arguments that we pass it into as 'const'
> as well.
> 
> Fixes: 10caabdaad5a ("net/mlx5e: Use termination table for VLAN push
> actions")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Acked-by: Saeed Mahameed <saeedm@...lanox.com>
> Acked-by: Mark Bloch <markb@...lanox.com>

Applied to net-next-mlx5 and will be submitted to net-next soon.

Thanks,
Saeed.