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From: "Pali Rohár" <pali@kernel.org>
To: Michael Turquette <mturquette@baylibre.com>,
	Stephen Boyd <sboyd@kernel.org>, Rob Herring <robh+dt@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Andrew Lunn" <andrew@lunn.ch>,
	"Gregory Clement" <gregory.clement@bootlin.com>,
	"Sebastian Hesselbarth" <sebastian.hesselbarth@gmail.com>,
	"Vladimir Vid" <vladimir.vid@sartura.hr>,
	"Marek Behún" <kabel@kernel.org>,
	linux-clk@vger.kernel.org, linux-serial@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org
Subject: [PATCH v6 1/6] math64: New DIV_U64_ROUND_CLOSEST helper
Date: Wed, 29 Sep 2021 10:20:29 +0200	[thread overview]
Message-ID: <20210929082034.15098-2-pali@kernel.org> (raw)
In-Reply-To: <20210929082034.15098-1-pali@kernel.org>

Provide DIV_U64_ROUND_CLOSEST helper which uses div_u64 to perform
division rounded to the closest integer using unsigned 64bit
dividend and unsigned 32bit divisor.

Signed-off-by: Pali Rohár <pali@kernel.org>
---
 include/linux/math64.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/linux/math64.h b/include/linux/math64.h
index 2928f03d6d46..a14f40de1dca 100644
--- a/include/linux/math64.h
+++ b/include/linux/math64.h
@@ -300,6 +300,19 @@ u64 mul_u64_u64_div_u64(u64 a, u64 mul, u64 div);
 #define DIV64_U64_ROUND_CLOSEST(dividend, divisor)	\
 	({ u64 _tmp = (divisor); div64_u64((dividend) + _tmp / 2, _tmp); })
 
+/*
+ * DIV_U64_ROUND_CLOSEST - unsigned 64bit divide with 32bit divisor rounded to nearest integer
+ * @dividend: unsigned 64bit dividend
+ * @divisor: unsigned 32bit divisor
+ *
+ * Divide unsigned 64bit dividend by unsigned 32bit divisor
+ * and round to closest integer.
+ *
+ * Return: dividend / divisor rounded to nearest integer
+ */
+#define DIV_U64_ROUND_CLOSEST(dividend, divisor)	\
+	({ u32 _tmp = (divisor); div_u64((u64)(dividend) + _tmp / 2, _tmp); })
+
 /*
  * DIV_S64_ROUND_CLOSEST - signed 64bit divide with 32bit divisor rounded to nearest integer
  * @dividend: signed 64bit dividend
-- 
2.20.1


  reply	other threads:[~2021-09-29  8:23 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-29  8:20 [PATCH v6 0/6] serial: mvebu-uart: Support for higher baudrates Pali Rohár
2021-09-29  8:20 ` Pali Rohár [this message]
2021-09-29  8:20 ` [PATCH v6 2/6] serial: mvebu-uart: implement UART clock driver for configuring UART base clock Pali Rohár
2021-09-29  8:20 ` [PATCH v6 3/6] dt-bindings: mvebu-uart: document DT bindings for marvell,armada-3700-uart-clock Pali Rohár
2021-09-29 13:46   ` Rob Herring
2021-09-29 14:01     ` Pali Rohár
2021-09-29 21:30       ` Rob Herring
2021-09-29  8:20 ` [PATCH v6 4/6] dt-bindings: mvebu-uart: update information about UART clock Pali Rohár
2021-09-29  8:20 ` [PATCH v6 5/6] arm64: dts: marvell: armada-37xx: add device node for UART clock and use it Pali Rohár
2021-09-29  8:20 ` [PATCH v6 6/6] serial: mvebu-uart: implement support for baudrates higher than 230400 Pali Rohár

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