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

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Message-ID: <20250703184403.274408-3-corbet@lwn.net>
Date: Thu,  3 Jul 2025 12:43:58 -0600
From: Jonathan Corbet <corbet@....net>
To: linux-doc@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
	Akira Yokosawa <akiyks@...il.com>,
	Jonathan Corbet <corbet@....net>
Subject: [PATCH v2 2/7] docs: kdoc: micro-optimize KernRe

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)
+        if not self.regex:
             self.regex = re.compile(string, flags=flags)
-
             if self.cache:
                 re_cache[string] = self.regex
 
-- 
2.49.0