[PATCH v4] scripts/checkpatch.pl: remove _deferred and _deferred_once false warning

[Maninder Singh]

with commit 98e35f5894cf ("printk: git rid of [sched_delayed] message for
printk_deferred") printk_deferred and printk_deferred_once requires
LOGLEVEL in argument, but checkpatch.pl was not fixed and still reports
it as warning:

WARNING: Possible unnecessary KERN_ALERT
printk_deferred(KERN_ALERT "checking deferred\n");

Co-developed-by: Vaneet Narang <v.narang@xxxxxxxxxxx>
Signed-off-by: Vaneet Narang <v.narang@xxxxxxxxxxx>
Signed-off-by: Maninder Singh <maninder1.s@xxxxxxxxxxx>
---
v3 -> v4: v3 was dropped, because it starts reporting *_printk as
          unnecessary KERNEL_* levels as report by Joe Perches.
          dev_printk(KERN_DEBUG "foo", ...). thus fixing it with simple
          addition of deferred in same line of _ratelimited as original
          https://lkml.org/lkml/2021/8/24/91

 scripts/checkpatch.pl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 2653177f52d9..78053545a0d5 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -6312,7 +6312,7 @@ sub process {
 		}
 
 # check for logging functions with KERN_<LEVEL>
-		if ($line !~ /printk(?:_ratelimited|_once)?\s*\(/ &&
+		if ($line !~ /printk(?:_ratelimited|_once|_deferred|_deferred_once)?\s*\(/ &&
 		    $line =~ /\b$logFunctions\s*\(.*\b(KERN_[A-Z]+)\b/) {
 			my $level = $1;
 			if (WARN("UNNECESSARY_KERN_LEVEL",
-- 
2.17.1