checkpatch: suggest pr_<level> over printk(KERN_<LEVEL>

Suggest the shorter pr_<level> instead of printk(KERN_<LEVEL>.

Prefer to use pr_<level> over bare printks.
Prefer to use pr_warn over pr_warning.

Signed-off-by: Joe Perches <joe@perches.com>
Cc: Andy Whitcroft <apw@shadowen.org>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index de639eeeed506b76b54220e7e7f86ed879af02a1..512766594ddf9ea103b7c897ad60dfd51edef46b 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2388,6 +2388,19 @@ sub process {
                        }
                }
 
+               if ($line =~ /\bprintk\s*\(\s*KERN_([A-Z]+)/) {
+                       my $orig = $1;
+                       my $level = lc($orig);
+                       $level = "warn" if ($level eq "warning");
+                       WARN("PREFER_PR_LEVEL",
+                            "Prefer pr_$level(... to printk(KERN_$1, ...\n" . $herecurr);
+               }
+
+               if ($line =~ /\bpr_warning\s*\(/) {
+                       WARN("PREFER_PR_LEVEL",
+                            "Prefer pr_warn(... to pr_warning(...\n" . $herecurr);
+               }
+
 # function brace can't be on same line, except for #defines of do while,
 # or if closed on same line
                if (($line=~/$Type\s*$Ident\(.*\).*\s{/) and