linux-kernel - [PATCH v3] checkpatch: add fix option for ASSIGNMENT

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Date:   Tue, 17 Nov 2020 22:48:56 +0530
From:   Aditya Srivastava <yashsri421@...il.com>
To:     joe@...ches.com
Cc:     yashsri421@...il.com,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        linux-kernel@...r.kernel.org, lukas.bulwahn@...il.com
Subject: [PATCH v3] checkpatch: add fix option for ASSIGNMENT_CONTINUATIONS

Currently, checkpatch warns us if an assignment operator is placed
at the start of a line and not at the end of previous line.

E.g., running checkpatch on commit 8195b1396ec8 ("hv_netvsc: fix
deadlock on hotplug") reports:

CHECK: Assignment operator '=' should be on the previous line
+	struct netvsc_device *nvdev
+		= container_of(w, struct netvsc_device, subchan_work);

Provide a simple fix by appending assignment operator to the previous
line and removing from the current line, if both the lines are additions
(ie start with '+')

Signed-off-by: Aditya Srivastava <yashsri421@...il.com>
---
Changes in v2:
add check if both the lines are additions (ie start with '+')

Changes in v3:
quote $operator; test with division assignment operator ('/=')

 scripts/checkpatch.pl | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index c9aaaa443265..d5bc4d8e4f6c 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3542,8 +3542,14 @@ sub process {
 
 # check for assignments on the start of a line
 		if ($sline =~ /^\+\s+($Assignment)[^=]/) {
-			CHK("ASSIGNMENT_CONTINUATIONS",
-			    "Assignment operator '$1' should be on the previous line\n" . $hereprev);
+			my $operator = "$1";
+			if (CHK("ASSIGNMENT_CONTINUATIONS",
+				"Assignment operator '$1' should be on the previous line\n" . $hereprev) &&
+			    $fix && $prevrawline =~ /^\+/) {
+				# add assignment operator to the previous line, remove from current line
+				$fixed[$fixlinenr - 1] .= " $operator";
+				$fixed[$fixlinenr] =~ s/$operator\s*//;
+			}
 		}
 
 # check for && or || at the start of a line
-- 
2.17.1