[PATCH v2] checkpatch: add fix option for ASSIGNMENT_CONTINUATIONS

From: Aditya Srivastava
Date: Tue Nov 17 2020 - 05:52:51 EST


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@xxxxxxxxx>
---
Changes in v2:
add check if both the lines are additions (ie start with '+')

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

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index c9aaaa443265..e0cb36369b2f 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