linux-kernel - Re: [PATCH v2 2/7] docs: kdoc: micro-optimize KernRe

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: <20250704003146.118f5799@foz.lan>
Date: Fri, 4 Jul 2025 00:31:46 +0200
From: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To: Jonathan Corbet <corbet@....net>
Cc: linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, Akira Yokosawa
 <akiyks@...il.com>
Subject: Re: [PATCH v2 2/7] docs: kdoc: micro-optimize KernRe

Em Thu,  3 Jul 2025 12:43:58 -0600
Jonathan Corbet <corbet@....net> escreveu:

> Rework _add_regex() to avoid doing the lookup twice for the (hopefully
> common) cache-hit case.
> 
> Signed-off-by: Jonathan Corbet <corbet@....net>
> ---
>  scripts/lib/kdoc/kdoc_re.py | 7 ++-----
>  1 file changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/scripts/lib/kdoc/kdoc_re.py b/scripts/lib/kdoc/kdoc_re.py
> index e81695b273bf..612223e1e723 100644
> --- a/scripts/lib/kdoc/kdoc_re.py
> +++ b/scripts/lib/kdoc/kdoc_re.py
> @@ -29,12 +29,9 @@ class KernRe:
>          """
>          Adds a new regex or re-use it from the cache.
>          """
> -
> -        if string in re_cache:
> -            self.regex = re_cache[string]
> -        else:
> +        self.regex = re_cache.get(string, None)

With get, None is default...

> +        if not self.regex:
>              self.regex = re.compile(string, flags=flags)

... yet, as you're using get, better to code it as:

	self.regex = re_cache.get(string, re.compile(string, flags=flags))

> -
>              if self.cache:
>                  re_cache[string] = self.regex
>  



Thanks,
Mauro