linux-kernel - [PATCH] checkpatch: Fix check for embedded filename

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Date:   Sat,  5 Jun 2021 21:42:19 +0530
From:   Dwaipayan Ray <dwaipayanray1@...il.com>
To:     joe@...ches.com
Cc:     linux-kernel@...r.kernel.org, lukas.bulwahn@...il.com,
        Dwaipayan Ray <dwaipayanray1@...il.com>
Subject: [PATCH] checkpatch: Fix check for embedded filename

When checkpatch is run on file contents piped through stdin,
it may generate false EMBEDDED_FILENAME warnings if the
--file flag is used.

Consider the following test file:
$cat test.c
int x = a - b;

$cat test.c | ./scripts/checkpatch.pl -f
WARNING: It's generally not useful to have the filename in the file
+int x = a - b;

So any instance of "-" in the file contents will trigger
an EMBEDDED_FILENAME warning.

Fix it by checking if $realfile is not "-".

Signed-off-by: Dwaipayan Ray <dwaipayanray1@...il.com>
---
 scripts/checkpatch.pl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 3e1795311c87..2f50fafa0ac1 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3619,7 +3619,7 @@ sub process {
 		}
 
 # check for embedded filenames
-		if ($rawline =~ /^\+.*\Q$realfile\E/) {
+		if ($realfile ne "-" && $rawline =~ /^\+.*\Q$realfile\E/) {
 			WARN("EMBEDDED_FILENAME",
 			     "It's generally not useful to have the filename in the file\n" . $herecurr);
 		}
-- 
2.28.0