linux-kernel - Re: [PATCH net-next 1/6] tools: ynl-gen: bitshift the flag values in the generated code

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <168fe516-b097-4bc3-8b72-acee310216a6@fiberby.net>
Date: Tue, 14 Oct 2025 16:27:53 +0000
From: Asbjørn Sloth Tønnesen <ast@...erby.net>
To: Jacob Keller <jacob.e.keller@...el.com>
Cc: Alexei Starovoitov <ast@...nel.org>, Andrew Lunn <andrew+netdev@...n.ch>,
 Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>,
 Daniel Borkmann <daniel@...earbox.net>, Daniel Zahka
 <daniel.zahka@...il.com>, Donald Hunter <donald.hunter@...il.com>,
 Jesper Dangaard Brouer <hawk@...nel.org>, Jiri Pirko <jiri@...nulli.us>,
 Joe Damato <jdamato@...tly.com>, John Fastabend <john.fastabend@...il.com>,
 Jonathan Corbet <corbet@....net>, Simon Horman <horms@...nel.org>,
 Stanislav Fomichev <sdf@...ichev.me>,
 Toke Høiland-Jørgensen <toke@...hat.com>,
 Vadim Fedorenko <vadim.fedorenko@...ux.dev>,
 Willem de Bruijn <willemb@...gle.com>, bpf@...r.kernel.org,
 netdev@...r.kernel.org, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org, Paolo Abeni <pabeni@...hat.com>,
 Eric Dumazet <edumazet@...gle.com>, "David S. Miller" <davem@...emloft.net>,
 Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH net-next 1/6] tools: ynl-gen: bitshift the flag values in
 the generated code

On 10/13/25 11:07 PM, Jacob Keller wrote:
> On 10/13/2025 9:49 AM, Asbjørn Sloth Tønnesen wrote:
>> Instead of pre-computing the flag values within the code generator,
>> then move the bitshift operation into the generated code.
>>
>> This IMHO makes the generated code read more like handwritten code.
>>
>> No functional changes.
>>
> 
> Could we use BIT() here? or is that not available within uAPI headers?

Correct, BIT() is not exported to uAPI[1].

Thank you for the reviews!

[1] [PATCH v2] checkpatch: don't complain about BIT macro in uapi
https://lore.kernel.org/all/1468707033-16173-1-git-send-email-tomas.winkler@intel.com/