Refactor parity calculations to use the standard parity8() helper. This
change eliminates redundant implementations and improves code
efficiency.

Co-developed-by: Yu-Chun Lin <redacted>
Signed-off-by: Yu-Chun Lin <redacted>
Signed-off-by: Kuan-Wei Chiu <visitorckw@gmail.com>
---
Changes in v3:
- Change parity8(c) to !!parity8(c).

 drivers/tty/serial/max3100.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/max3100.c b/drivers/tty/serial/max3100.c
index cde5f1c86353..419d74043498 100644
--- a/drivers/tty/serial/max3100.c
+++ b/drivers/tty/serial/max3100.c

@@ -16,6 +16,7 @@
 /* 4 MAX3100s should be enough for everyone */
 #define MAX_MAX3100 4
 
+#include <linux/bitops.h>
 #include <linux/container_of.h>
 #include <linux/delay.h>
 #include <linux/device.h>

@@ -133,7 +134,7 @@ static int max3100_do_parity(struct max3100_port *s, u16 c)
 	else
 		c &= 0xff;
 
-	parity = parity ^ (hweight8(c) & 1);
+	parity = parity ^ !!parity8(c);
 	return parity;
 }
 

-- 
2.34.1