netdev - Re: [PATCH 8/9] mlx5: stop warning for 64KB pages

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Date: Fri, 29 Mar 2024 00:39:23 +0200
From: Tariq Toukan <ttoukan.linux@...il.com>
To: Arnd Bergmann <arnd@...nel.org>, linux-kernel@...r.kernel.org,
 Saeed Mahameed <saeedm@...dia.com>, Leon Romanovsky <leon@...nel.org>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Nathan Chancellor <nathan@...nel.org>,
 Jonathan Lemon <jonathan.lemon@...il.com>,
 Maxim Mikityanskiy <maxtram95@...il.com>,
 Daniel Borkmann <daniel@...earbox.net>
Cc: Arnd Bergmann <arnd@...db.de>, Nick Desaulniers
 <ndesaulniers@...gle.com>, Bill Wendling <morbo@...gle.com>,
 Justin Stitt <justinstitt@...gle.com>, Gal Pressman <gal@...dia.com>,
 netdev@...r.kernel.org, linux-rdma@...r.kernel.org, llvm@...ts.linux.dev,
 Tariq Toukan <tariqt@...dia.com>
Subject: Re: [PATCH 8/9] mlx5: stop warning for 64KB pages

On 28/03/2024 16:30, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> When building with 64KB pages, clang points out that xsk->chunk_size
> can never be PAGE_SIZE:
> 
> drivers/net/ethernet/mellanox/mlx5/core/en/xsk/setup.c:19:22: error: result of comparison of constant 65536 with expression of type 'u16' (aka 'unsigned short') is always false [-Werror,-Wtautological-constant-out-of-range-compare]
>          if (xsk->chunk_size > PAGE_SIZE ||
>              ~~~~~~~~~~~~~~~ ^ ~~~~~~~~~
> 
> In older versions of this code, using PAGE_SIZE was the only
> possibility, so this would have never worked on 64KB page kernels,
> but the patch apparently did not address this case completely.
> 
> As Maxim Mikityanskiy suggested, 64KB chunks are really not all that
> useful, so just shut up the warning by adding a cast.
> 
> Fixes: 282c0c798f8e ("net/mlx5e: Allow XSK frames smaller than a page")
> Link: https://lore.kernel.org/netdev/20211013150232.2942146-1-arnd@kernel.org/
> Link: https://lore.kernel.org/lkml/a7b27541-0ebb-4f2d-bd06-270a4d404613@app.fastmail.com/
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Thanks for your patch.

Reviewed-by: Tariq Toukan <tariqt@...dia.com>