linux-kernel - [PATCH v4] checkpatch: add check for continue statement in UNNECESSARY

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Message-Id: <20211003053856.10348-1-utkarshverma294@gmail.com>
Date:   Sun,  3 Oct 2021 11:08:56 +0530
From:   Utkarsh Verma <utkarshverma294@...il.com>
To:     Andy Whitcroft <apw@...onical.com>, Joe Perches <joe@...ches.com>,
        Dwaipayan Ray <dwaipayanray1@...il.com>,
        Lukas Bulwahn <lukas.bulwahn@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        Utkarsh Verma <utkarshverma294@...il.com>
Subject: [PATCH v4] checkpatch: add check for continue statement in UNNECESSARY_ELSE

UNNECESSARY_ELSE only checks for the usage of else after a return or
break. But the same logic applies for the continue statement.

An else branch used after a continue statement is unnecessary. So add
a test for the continue statement, too.

Signed-off-by: Utkarsh Verma <utkarshverma294@...il.com>
---
 scripts/checkpatch.pl | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index c27d2312cfc3..0eee086d87fe 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -4011,15 +4011,15 @@ sub process {
 
 # check indentation of any line with a bare else
 # (but not if it is a multiple line "if (foo) return bar; else return baz;")
-# if the previous line is a break or return and is indented 1 tab more...
+# if the previous line is a break or continue or return and is indented 1 tab more...
 		if ($sline =~ /^\+([\t]+)(?:}[ \t]*)?else(?:[ \t]*{)?\s*$/) {
 			my $tabs = length($1) + 1;
-			if ($prevline =~ /^\+\t{$tabs,$tabs}break\b/ ||
-			    ($prevline =~ /^\+\t{$tabs,$tabs}return\b/ &&
-			     defined $lines[$linenr] &&
-			     $lines[$linenr] !~ /^[ \+]\t{$tabs,$tabs}return/)) {
+			if ($prevline =~ /^\+\t{$tabs,$tabs}(break|continue|return)\b/ &&
+			    !($1 eq "return" &&
+			      defined $lines[$linenr] &&
+			      $lines[$linenr] =~ /^[ \+]\t{$tabs,$tabs}return/)) {
 				WARN("UNNECESSARY_ELSE",
-				     "else is not generally useful after a break or return\n" . $hereprev);
+				     "else is not generally useful after a $1\n" . $hereprev);
 			}
 		}
 
-- 
2.25.1