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Subject[PATCH v2] checkpatch: skip warnings for symbol links
Date
From: Geliang Tang <tanggeliang@kylinos.cn>

If there is a symbol link in the given patch, like the following one:

$ cat 0001-selftests-bpf-Add-mptcp-pm_nl_ctl-link.patch

'''
# diff --git a/tools/testing/selftests/bpf/mptcp_pm_nl_ctl.c \
# b/tools/testing/selftests/bpf/mptcp_pm_nl_ctl.c
# new file mode 120000
# index 000000000000..5a08c255b278
# --- /dev/null
# +++ b/tools/testing/selftests/bpf/mptcp_pm_nl_ctl.c
# @@ -0,0 +1 @@
# +../net/mptcp/pm_nl_ctl.c
# \ No newline at end of file
'''

checkpatch.pl reports two inaccurate warnings:

'''
WARNING: Missing or malformed SPDX-License-Identifier tag in line 1
#65: FILE: tools/testing/selftests/bpf/mptcp_pm_nl_ctl.c:1:
+../net/mptcp/pm_nl_ctl.c

WARNING: adding a line without newline at end of file
#65: FILE: tools/testing/selftests/bpf/mptcp_pm_nl_ctl.c:1:
+../net/mptcp/pm_nl_ctl.c
'''

And three checks if run it with strict option:

'''
CHECK: spaces preferred around that '/' (ctx:VxV)
#65: FILE: tools/testing/selftests/bpf/mptcp_pm_nl_ctl.c:1:
+../net/mptcp/pm_nl_ctl.c
^

CHECK: spaces preferred around that '/' (ctx:VxV)
#65: FILE: tools/testing/selftests/bpf/mptcp_pm_nl_ctl.c:1:
+../net/mptcp/pm_nl_ctl.c
^

CHECK: spaces preferred around that '/' (ctx:VxV)
#65: FILE: tools/testing/selftests/bpf/mptcp_pm_nl_ctl.c:1:
+../net/mptcp/pm_nl_ctl.c
'''

This patch fixes this by adding a new variable $symbol_link in checkpatch
script, set it if the new file mode is 120000. Skip "missing or malformed
SPDX-License-Identifier tag", "adding a line without newline at end of
file" and "spaces preferred around that '/'" checks if this variable is
set.

Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
---
v2:
- fix warnings with strict option too.
---
scripts/checkpatch.pl | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 9c4c4a61bc83..bed03c80190c 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2694,6 +2694,8 @@ sub process {

my $checklicenseline = 1;

+ my $symbol_link = 0;
+
sanitise_line_reset();
my $line;
foreach my $rawline (@rawlines) {
@@ -3564,6 +3566,11 @@ sub process {
# ignore non-hunk lines and lines being removed
next if (!$hunk_line || $line =~ /^-/);

+# Check for symbol links
+ if ($line =~ /^new file mode 120000$/) {
+ $symbol_link = 1;
+ }
+
#trailing whitespace
if ($line =~ /^\+.*\015/) {
my $herevet = "$here\n" . cat_vet($rawline) . "\n";
@@ -3756,7 +3763,8 @@ sub process {
}

if ($comment !~ /^$/ &&
- $rawline !~ m@^\+\Q$comment\E SPDX-License-Identifier: @) {
+ $rawline !~ m@^\+\Q$comment\E SPDX-License-Identifier: @ &&
+ $symbol_link =~ 1) {
WARN("SPDX_LICENSE_TAG",
"Missing or malformed SPDX-License-Identifier tag in line $checklicenseline\n" . $herecurr);
} elsif ($rawline =~ /(SPDX-License-Identifier: .*)/) {
@@ -3867,7 +3875,8 @@ sub process {
}

# check for adding lines without a newline.
- if ($line =~ /^\+/ && defined $lines[$linenr] && $lines[$linenr] =~ /^\\ No newline at end of file/) {
+ if ($line =~ /^\+/ && defined $lines[$linenr] && $lines[$linenr] =~ /^\\ No newline at end of file/ &&
+ $symbol_link =~ 1) {
if (WARN("MISSING_EOF_NEWLINE",
"adding a line without newline at end of file\n" . $herecurr) &&
$fix) {
@@ -5293,7 +5302,7 @@ sub process {
$op eq '*' or $op eq '/' or
$op eq '%')
{
- if ($check) {
+ if ($check && $symbol_link =~ 1) {
if (defined $fix_elements[$n + 2] && $ctx !~ /[EW]x[EW]/) {
if (CHK("SPACING",
"spaces preferred around that '$op' $at\n" . $hereptr)) {
--
2.43.0

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