linux-kernel - [PATCH v1] checkpatch: check for #if 0/#if 1

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Date:   Wed, 25 Jul 2018 16:14:05 -0700
From:   Prakruthi Deepak Heragu <pheragu@...eaurora.org>
To:     apw@...onical.com, joe@...ches.com
Cc:     linux-kernel@...r.kernel.org, ckadabi@...eaurora.org,
        tsoni@...eaurora.org, bryanh@...eaurora.org,
        Abhijeet Dharmapurikar <adharmap@...eaurora.org>,
        Prakruthi Deepak Heragu <pheragu@...eaurora.org>
Subject: [PATCH v1] checkpatch: check for #if 0/#if 1

The #if 0 or #if 1 is used to toggle features. Warn if #if 0 or #if 1
is present and suggest that they can be removed.

Signed-off-by: Abhijeet Dharmapurikar <adharmap@...eaurora.org>
Signed-off-by: Prakruthi Deepak Heragu <pheragu@...eaurora.org>
---
Changes in v1:
- Rephrase the warning message to fit in a single line without 
  80 column limit

 scripts/checkpatch.pl | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 3394ed8..72513c2 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -5383,9 +5383,14 @@ sub process {
 
 # warn about #if 0
 		if ($line =~ /^.\s*\#\s*if\s+0\b/) {
-			CHK("REDUNDANT_CODE",
-			    "if this code is redundant consider removing it\n" .
-				$herecurr);
+			WARN("IF_0",
+			     "Consider removing the #if 0 and its #endif\n".  $herecurr);
+		}
+
+# warn about #if 1
+		if ($line =~ /^.\s*\#\s*if\s+1\b/) {
+			WARN("IF_1",
+			     "Consider removing the #if 1 and its #endif\n".  $herecurr);
 		}
 
 # check for needless "if (<foo>) fn(<foo>)" uses
-- 
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