[PATCH v2 09/15] timers: Add a warning to usleep_range_state() for wrong order of arguments

[Anna-Maria Behnsen]

There is a warning in checkpatch script that triggers, when min and max
arguments of usleep_range_state() are in reverse order. This check does
only cover callsites which uses constants. Move this check into the code as
a WARN_ON_ONCE() to also cover callsites not using constants and get rid of
it in checkpatch.

Cc: Andy Whitcroft <apw@xxxxxxxxxxxxx>
Cc: Joe Perches <joe@xxxxxxxxxxx>
Signed-off-by: Anna-Maria Behnsen <anna-maria@xxxxxxxxxxxxx>
---
 kernel/time/sleep_timeout.c | 2 ++
 scripts/checkpatch.pl       | 4 ----
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/kernel/time/sleep_timeout.c b/kernel/time/sleep_timeout.c
index 21f412350b15..4b805d7e1903 100644
--- a/kernel/time/sleep_timeout.c
+++ b/kernel/time/sleep_timeout.c
@@ -364,6 +364,8 @@ void __sched usleep_range_state(unsigned long min, unsigned long max, unsigned i
 	ktime_t exp = ktime_add_us(ktime_get(), min);
 	u64 delta = (u64)(max - min) * NSEC_PER_USEC;
 
+	WARN_ON_ONCE(max < min);
+
 	for (;;) {
 		__set_current_state(state);
 		/* Do not return before the requested sleep time has elapsed */
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 39032224d504..ba3359bdd1fa 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -7088,10 +7088,6 @@ sub process {
 			if ($min eq $max) {
 				WARN("USLEEP_RANGE",
 				     "usleep_range should not use min == max args; see Documentation/timers/timers-howto.rst\n" . "$here\n$stat\n");
-			} elsif ($min =~ /^\d+$/ && $max =~ /^\d+$/ &&
-				 $min > $max) {
-				WARN("USLEEP_RANGE",
-				     "usleep_range args reversed, use min then max; see Documentation/timers/timers-howto.rst\n" . "$here\n$stat\n");
 			}
 		}
 

-- 
2.39.2