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

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Date:   Mon, 17 Jun 2019 21:30:34 +0000
From:   Saeed Mahameed <saeedm@...lanox.com>
To:     "davem@...emloft.net" <davem@...emloft.net>,
        "arnd@...db.de" <arnd@...db.de>
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>,
        Eli Britstein <elibr@...lanox.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "leon@...nel.org" <leon@...nel.org>
Subject: Re: [PATCH] net/mlx5e: reduce stack usage in
 mlx5_eswitch_termtbl_create

On Mon, 2019-06-17 at 14:02 -0700, David Miller wrote:
> 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?

Yes, this is a core change that might conflict with some ongoing stuff.

Thank you Dave !
Saeed.