linux-kernel - Re: [PATCH net-next v2 0/3] compiler_types: add Endianness-dependent __counted_by

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Message-ID: <7c8a3936-6010-47a8-a3ac-24adbb903613@intel.com>
Date: Thu, 28 Mar 2024 11:11:54 +0100
From: Przemek Kitszel <przemyslaw.kitszel@...el.com>
To: Alexander Lobakin <aleksander.lobakin@...el.com>, "David S. Miller"
	<davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
CC: Kees Cook <keescook@...omium.org>, "Gustavo A. R. Silva"
	<gustavoars@...nel.org>, Nathan Chancellor <nathan@...nel.org>, Simon Horman
	<horms@...nel.org>, <nex.sw.ncis.osdt.itp.upstreaming@...el.com>,
	<intel-wired-lan@...ts.osuosl.org>, <linux-hardening@...r.kernel.org>,
	<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next v2 0/3] compiler_types: add Endianness-dependent
 __counted_by_{le,be}

On 3/27/24 15:22, Alexander Lobakin wrote:
> Some structures contain flexible arrays at the end and the counter for
> them, but the counter has explicit Endianness and thus __counted_by()
> can't be used directly.
> 
> To increase test coverage for potential problems without breaking
> anything, introduce __counted_by_{le,be} defined depending on platform's
> Endianness to either __counted_by() when applicable or noop otherwise.
> The first user will be virtchnl2.h from idpf just as example with 9 flex
> structures having Little Endian counters.
> 
> Maybe it would be a good idea to introduce such attributes on compiler
> level if possible, but for now let's stop on what we have.
> 
> Alexander Lobakin (3):
>    compiler_types: add Endianness-dependent __counted_by_{le,be}
>    idpf: make virtchnl2.h self-contained
>    idpf: sprinkle __counted_by{,_le}() in the virtchnl2 header
> 
>   Documentation/conf.py                       |  2 ++
>   scripts/kernel-doc                          |  1 +
>   include/linux/compiler_types.h              | 11 ++++++++++
>   drivers/net/ethernet/intel/idpf/idpf_txrx.h |  2 ++
>   drivers/net/ethernet/intel/idpf/virtchnl2.h | 24 ++++++++++-----------
>   5 files changed, 28 insertions(+), 12 deletions(-)
> 
> ---
>  From v1[0]:
> * fix compilation of #2 (Jakub);
> * pick Acked-bys (Gustavo).
> 
>  From RFC[1]:
> 
> * teach kdoc new attributes (Simon, Kees);
> * add Acked-by (Kees);
> * fix a couple typos;
> * send to net-next (Kees).
> 
> [0] https://lore.kernel.org/netdev/20240326164116.645718-1-aleksander.lobakin@intel.com
> [1] https://lore.kernel.org/netdev/20240318130354.2713265-1-aleksander.lobakin@intel.com

nice,
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>