linux-kernel - [PATCH] kbuild: uapi: Drop check

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Message-Id: <20251230-uapi-check_config-v1-1-00ecec109f39@linutronix.de>
Date: Tue, 30 Dec 2025 08:09:29 +0100
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Nathan Chancellor <nathan@...nel.org>, Nicolas Schier <nsc@...nel.org>
Cc: linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH] kbuild: uapi: Drop check_config()

headers_install.sh already tests for CONFIG symbols. It does so in a
more comprehensive way, by only checking for references in code and
also running even if CONFIG_UAPI_HEADER_TEST is disabled.
And check_config() has been disabled any case.

Drop the pointless check.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
 usr/include/headers_check.pl | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/usr/include/headers_check.pl b/usr/include/headers_check.pl
index af5a513eaa00..6cd6eb652c8d 100755
--- a/usr/include/headers_check.pl
+++ b/usr/include/headers_check.pl
@@ -40,7 +40,6 @@ foreach my $file (@files) {
 		&check_include();
 		&check_asm_types();
 		&check_declarations();
-		# Dropped for now. Too much noise &check_config();
 	}
 	close $fh;
 }
@@ -77,13 +76,6 @@ sub check_declarations
 	}
 }
 
-sub check_config
-{
-	if ($line =~ m/[^a-zA-Z0-9_]+CONFIG_([a-zA-Z0-9_]+)[^a-zA-Z0-9_]/) {
-		printf STDERR "$filename:$lineno: leaks CONFIG_$1 to userspace where it is not valid\n";
-	}
-}
-
 my $linux_asm_types;
 sub check_asm_types
 {

---
base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8
change-id: 20251229-uapi-check_config-8aa43e365846

Best regards,
-- 
Thomas Weißschuh <thomas.weissschuh@...utronix.de>