linux-kernel - Re: [PATCH] net/mlx5e: reduce stack usage in mlx5_eswitch_termtbl

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Message-Id: <20190617.140230.537297372523260104.davem@davemloft.net>
Date:   Mon, 17 Jun 2019 14:02:30 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     arnd@...db.de
Cc:     saeedm@...lanox.com, leon@...nel.org, ozsh@...lanox.com,
        paulb@...lanox.com, elibr@...lanox.com, markb@...lanox.com,
        ogerlitz@...lanox.com, maorg@...lanox.com, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net/mlx5e: reduce stack usage in
 mlx5_eswitch_termtbl_create

From: Arnd Bergmann <arnd@...db.de>
Date: Mon, 17 Jun 2019 13:08:22 +0200

> 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>

Saeed, once Arnd fixes the reverse christmas tree issue, I assume you will take
this in via your tree?

Thanks.