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Subject[PATCH] checkpatch: Add PREFER_IS_ENABLED test
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Using #if defined CONFIG_<FOO> || defined CONFIG_<FOO>_MODULE is
more verbose than necessary and IS_ENABLED(CONFIG_<FOO>) is preferred.

So add a test and a message for it.

--fix it to if desired.

Signed-off-by: Joe Perches <joe@perches.com>
---
scripts/checkpatch.pl | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index d574d13..eb8f887 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -5637,6 +5637,16 @@ sub process {
}
}

+# check for #if defined CONFIG_<FOO> || defined CONFIG_<FOO>_MODULE
+ if ($line =~ /^\+\s*#\s*if\s+defined(?:\s*\(?\s*|\s+)(CONFIG_[A-Z_]+)\s*\)?\s*\|\|\s*defined(?:\s*\(?\s*|\s+)\1_MODULE\s*\)?\s*$/) {
+ my $config = $1;
+ if (WARN("PREFER_IS_ENABLED",
+ "Prefer IS_ENABLED(<FOO>) to CONFIG_<FOO> || CONFIG_<FOO>_MODULE\n" . $herecurr) &&
+ $fix) {
+ $fixed[$fixlinenr] = "\+#if IS_ENABLED($config)";
+ }
+ }
+
# check for case / default statements not preceded by break/fallthrough/switch
if ($line =~ /^.\s*(?:case\s+(?:$Ident|$Constant)\s*|default):/) {
my $has_break = 0;
--
2.7.4
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