checkpatch: prefer dev_<level>( to dev_printk(KERN_<LEVEL>

Add YA check to printk style.

dev_<level> uses are functions and generate smaller
object code than dev_printk(KERN_<LEVEL>.

Signed-off-by: Joe Perches <joe@perches.com>
Cc: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 2bb08a962ce3..f9afd075e109 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2430,6 +2430,15 @@ sub process {
                              "Prefer pr_warn(... to pr_warning(...\n" . $herecurr);
                 }
 
+                if ($line =~ /\bdev_printk\s*\(\s*KERN_([A-Z]+)/) {
+                        my $orig = $1;
+                        my $level = lc($orig);
+                        $level = "warn" if ($level eq "warning");
+                        $level = "dbg" if ($level eq "debug");
+                        WARN("PREFER_DEV_LEVEL",
+                             "Prefer dev_$level(... to dev_printk(KERN_$orig, ...\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