linux-kernel - [PATCH] checkpatch: Warn on logging functions with KERN

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Date:	Wed, 01 Oct 2014 21:08:20 -0700
From:	Joe Perches <joe@...ches.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Paul McQuade <paulmcquad@...il.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, neilb@...e.de, sasha.levin@...cle.com,
	rientjes@...gle.com, hughd@...gle.com,
	paul.gortmaker@...driver.com, liwanp@...ux.vnet.ibm.com,
	n-horiguchi@...jp.nec.com, iamjoonsoo.kim@....com
Subject: [PATCH] checkpatch: Warn on logging functions with KERN_<LEVEL>

Warn on probable misuses of logging functions with KERN_<LEVEL>
like pr_err(KERN_ERR "foo\n");

Suggested-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Joe Perches <joe@...ches.com>

---
> > -		printk(KERN_ERR "ksm: register sysfs failed\n");
> > +		pr_err(KERN_ERR "ksm: register sysfs failed\n");

> A quick grep indicates that we have the same mistake in tens of places.
> checkpatch rule, please?

 scripts/checkpatch.pl | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 52a223e..374abf4 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -4447,6 +4447,17 @@ sub process {
 			}
 		}
 
+# check for logging functions with KERN_<LEVEL>
+		if ($line !~ /printk\s*\(/ &&
+		    $line =~ /\b$logFunctions\s*\(.*\b(KERN_[A-Z]+)\b/) {
+			my $level = $1;
+			if (WARN("UNNECESSARY_KERN_LEVEL",
+				 "Possible unnecessary $level\n" . $herecurr) &&
+			    $fix) {
+				$fixed[$fixlinenr] =~ s/\s*$level\s*//;
+			}
+		}
+
 # check for bad placement of section $InitAttribute (e.g.: __initdata)
 		if ($line =~ /(\b$InitAttribute\b)/) {
 			my $attr = $1;


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