linux-kernel - [PATCH v5] serial: max3100: Replace open-coded parity calculation with parity8()

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Message-Id: <20250515081311.775559-1-visitorckw@gmail.com>
Date: Thu, 15 May 2025 16:13:11 +0800
From: Kuan-Wei Chiu <visitorckw@...il.com>
To: gregkh@...uxfoundation.org,
	jirislaby@...nel.org
Cc: linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org,
	jserv@...s.ncku.edu.tw,
	Kuan-Wei Chiu <visitorckw@...il.com>,
	Yu-Chun Lin <eleanor15x@...il.com>
Subject: [PATCH v5] serial: max3100: Replace open-coded parity calculation with parity8()

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

Co-developed-by: Yu-Chun Lin <eleanor15x@...il.com>
Signed-off-by: Yu-Chun Lin <eleanor15x@...il.com>
Signed-off-by: Kuan-Wei Chiu <visitorckw@...il.com>
---
Changes in v5:
- Dropped changes to bitops.h
- Switched to using existing parity8()
- Split parity8() conversion patch out of the series

 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 f2dd83692b2c..d28a2ebfa29f 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