linux-kernel - [PATCH] checkpatch: add --fix option to IS_ENABLED

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Date:   Thu, 10 Dec 2020 19:49:03 +0530
From:   Dwaipayan Ray <dwaipayanray1@...il.com>
To:     joe@...ches.com
Cc:     linux-kernel-mentees@...ts.linuxfoundation.org,
        dwaipayanray1@...il.com, linux-kernel@...r.kernel.org,
        lukas.bulwahn@...il.com
Subject: [PATCH] checkpatch: add --fix option to IS_ENABLED_CONFIG check

Documentation/process/coding-style.rst specifies the use of
IS_ENABLED macro:

Within code, where possible, use the IS_ENABLED macro to convert a Kconfig
symbol into a C boolean expression, and use it in a normal C conditional:

	if (IS_ENABLED(CONFIG_SOMETHING)) {
		...
	}

checkpatch correspondingly has a check for IS_ENABLED() without
CONFIG_<FOO>.
Add a --fix option to the check to automatically correct the argument.

Macros like:
 #if IS_ENABLED(THERMAL)

is corrected to:
 #if IS_ENABLED(CONFIG_THERMAL)

Signed-off-by: Dwaipayan Ray <dwaipayanray1@...il.com>
---
 scripts/checkpatch.pl | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 7b086d1cd6c2..751cd13622b9 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -6877,8 +6877,11 @@ sub process {
 
 # check for IS_ENABLED() without CONFIG_<FOO> ($rawline for comments too)
 		if ($rawline =~ /\bIS_ENABLED\s*\(\s*(\w+)\s*\)/ && $1 !~ /^${CONFIG_}/) {
-			WARN("IS_ENABLED_CONFIG",
-			     "IS_ENABLED($1) is normally used as IS_ENABLED(${CONFIG_}$1)\n" . $herecurr);
+			if (WARN("IS_ENABLED_CONFIG",
+				 "IS_ENABLED($1) is normally used as IS_ENABLED(${CONFIG_}$1)\n" . $herecurr) &&
+			    $fix) {
+				$fixed[$fixlinenr] =~ s/\bIS_ENABLED\s*\(\s*(\w+)\s*\)/IS_ENABLED(${CONFIG_}$1)/;
+			}
 		}
 
 # check for #if defined CONFIG_<FOO> || defined CONFIG_<FOO>_MODULE
-- 
2.27.0