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>,
"Geert Uytterhoeven" <geert@linux-m68k.org>,
linux-clk@vger.kernel.org, linux-serial@vger.kernel.org,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 07/11] math64: New DIV_U64_ROUND_CLOSEST helper
Date: Fri, 25 Jun 2021 16:36:13 +0200 [thread overview]
Message-ID: <20210625143617.12826-8-pali@kernel.org> (raw)
In-Reply-To: <20210625143617.12826-1-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 66deb1fdc2ef..1cc61d748e1f 100644
--- a/include/linux/math64.h
+++ b/include/linux/math64.h
@@ -281,6 +281,19 @@ 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
WARNING: multiple messages have this Message-ID (diff)
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>,
"Geert Uytterhoeven" <geert@linux-m68k.org>,
linux-clk@vger.kernel.org, linux-serial@vger.kernel.org,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 07/11] math64: New DIV_U64_ROUND_CLOSEST helper
Date: Fri, 25 Jun 2021 16:36:13 +0200 [thread overview]
Message-ID: <20210625143617.12826-8-pali@kernel.org> (raw)
In-Reply-To: <20210625143617.12826-1-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 66deb1fdc2ef..1cc61d748e1f 100644
--- a/include/linux/math64.h
+++ b/include/linux/math64.h
@@ -281,6 +281,19 @@ 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
_______________________________________________
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http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-06-25 14:37 UTC|newest]
Thread overview: 152+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-24 22:48 [PATCH 00/10] serial: mvebu-uart: Fixes and new support for higher baudrates Pali Rohár
2021-06-24 22:48 ` Pali Rohár
2021-06-24 22:49 ` [PATCH 01/10] serial: mvebu-uart: fix calculation of clock divisor Pali Rohár
2021-06-24 22:49 ` Pali Rohár
2021-06-24 22:49 ` [PATCH 02/10] serial: mvebu-uart: do not allow changing baudrate when uartclk is not available Pali Rohár
2021-06-24 22:49 ` Pali Rohár
2021-06-24 22:49 ` [PATCH 03/10] serial: mvebu-uart: correctly calculate minimal possible baudrate Pali Rohár
2021-06-24 22:49 ` Pali Rohár
2021-06-24 22:49 ` [PATCH 04/10] dt-bindings: mvebu-uart: fix documentation Pali Rohár
2021-06-24 22:49 ` Pali Rohár
2021-06-24 22:49 ` [PATCH 05/10] arm64: dts: marvell: armada-37xx: Fix reg for standard variant of UART Pali Rohár
2021-06-24 22:49 ` Pali Rohár
2021-06-24 22:49 ` [PATCH 06/10] serial: mvebu-uart: remove unused member nb from struct mvebu_uart Pali Rohár
2021-06-24 22:49 ` Pali Rohár
2021-06-24 22:49 ` [PATCH 07/10] serial: mvebu-uart: implement UART clock driver for configuring UART base clock Pali Rohár
2021-06-24 22:49 ` Pali Rohár
2021-06-25 5:36 ` kernel test robot
2021-06-25 5:36 ` kernel test robot
2021-06-25 8:15 ` kernel test robot
2021-06-25 8:15 ` kernel test robot
2021-06-25 9:31 ` Pali Rohár
2021-06-25 9:31 ` Pali Rohár
2021-06-25 11:05 ` Geert Uytterhoeven
2021-06-25 11:05 ` Geert Uytterhoeven
2021-06-25 11:29 ` Pali Rohár
2021-06-25 11:29 ` Pali Rohár
2021-06-25 12:44 ` Geert Uytterhoeven
2021-06-25 12:44 ` Geert Uytterhoeven
2021-06-25 13:22 ` Pali Rohár
2021-06-25 13:22 ` Pali Rohár
2021-06-25 13:35 ` Geert Uytterhoeven
2021-06-25 13:35 ` Geert Uytterhoeven
2021-06-25 14:09 ` Pali Rohár
2021-06-25 14:09 ` Pali Rohár
2021-06-24 22:49 ` [PATCH 08/10] dt-bindings: mvebu-uart: document DT bindings for marvell,armada-3700-uart-clock Pali Rohár
2021-06-24 22:49 ` [PATCH 08/10] dt-bindings: mvebu-uart: document DT bindings for marvell, armada-3700-uart-clock Pali Rohár
2021-06-24 22:49 ` [PATCH 09/10] arm64: dts: marvell: armada-37xx: add device node for UART clock and use it Pali Rohár
2021-06-24 22:49 ` Pali Rohár
2021-06-24 22:49 ` [PATCH 10/10] serial: mvebu-uart: implement support for baudrates higher than 230400 Pali Rohár
2021-06-24 22:49 ` Pali Rohár
2021-06-25 14:36 ` [PATCH v2 00/11] serial: mvebu-uart: Fixes and new support for higher baudrates Pali Rohár
2021-06-25 14:36 ` Pali Rohár
2021-06-25 14:36 ` [PATCH v2 01/11] serial: mvebu-uart: fix calculation of clock divisor Pali Rohár
2021-06-25 14:36 ` Pali Rohár
2021-06-25 14:36 ` [PATCH v2 02/11] serial: mvebu-uart: do not allow changing baudrate when uartclk is not available Pali Rohár
2021-06-25 14:36 ` Pali Rohár
2021-06-25 14:36 ` [PATCH v2 03/11] serial: mvebu-uart: correctly calculate minimal possible baudrate Pali Rohár
2021-06-25 14:36 ` Pali Rohár
2021-06-25 14:36 ` [PATCH v2 04/11] dt-bindings: mvebu-uart: fix documentation Pali Rohár
2021-06-25 14:36 ` Pali Rohár
2021-06-25 14:36 ` [PATCH v2 05/11] arm64: dts: marvell: armada-37xx: Fix reg for standard variant of UART Pali Rohár
2021-06-25 14:36 ` Pali Rohár
2021-06-25 14:36 ` [PATCH v2 06/11] serial: mvebu-uart: remove unused member nb from struct mvebu_uart Pali Rohár
2021-06-25 14:36 ` Pali Rohár
2021-06-25 14:36 ` Pali Rohár [this message]
2021-06-25 14:36 ` [PATCH v2 07/11] math64: New DIV_U64_ROUND_CLOSEST helper Pali Rohár
2021-06-25 15:22 ` Geert Uytterhoeven
2021-06-25 15:22 ` Geert Uytterhoeven
2021-06-25 15:38 ` Pali Rohár
2021-06-25 15:38 ` Pali Rohár
2021-06-25 15:50 ` Willy Tarreau
2021-06-25 15:50 ` Willy Tarreau
2021-06-25 17:39 ` Geert Uytterhoeven
2021-06-25 17:39 ` Geert Uytterhoeven
2021-06-25 17:44 ` Pali Rohár
2021-06-25 17:44 ` Pali Rohár
2021-06-25 18:11 ` Geert Uytterhoeven
2021-06-25 18:11 ` Geert Uytterhoeven
2021-07-19 12:45 ` Andy Shevchenko
2021-07-19 12:45 ` Andy Shevchenko
2021-06-25 14:36 ` [PATCH v2 08/11] serial: mvebu-uart: implement UART clock driver for configuring UART base clock Pali Rohár
2021-06-25 14:36 ` Pali Rohár
2021-06-25 14:36 ` [PATCH v2 09/11] dt-bindings: mvebu-uart: document DT bindings for marvell,armada-3700-uart-clock Pali Rohár
2021-06-25 14:36 ` [PATCH v2 09/11] dt-bindings: mvebu-uart: document DT bindings for marvell, armada-3700-uart-clock Pali Rohár
2021-06-25 14:36 ` [PATCH v2 10/11] arm64: dts: marvell: armada-37xx: add device node for UART clock and use it Pali Rohár
2021-06-25 14:36 ` Pali Rohár
2021-06-25 14:36 ` [PATCH v2 11/11] serial: mvebu-uart: implement support for baudrates higher than 230400 Pali Rohár
2021-06-25 14:36 ` Pali Rohár
2021-07-17 12:38 ` [PATCH v3 0/5] serial: mvebu-uart: Support for higher baudrates Pali Rohár
2021-07-17 12:38 ` Pali Rohár
2021-07-17 12:38 ` [PATCH v3 1/5] math64: New DIV_U64_ROUND_CLOSEST helper Pali Rohár
2021-07-17 12:38 ` Pali Rohár
2021-07-19 12:47 ` Andy Shevchenko
2021-07-19 12:47 ` Andy Shevchenko
2021-07-22 21:57 ` Pali Rohár
2021-07-22 21:57 ` Pali Rohár
2021-07-24 11:38 ` David Laight
2021-07-24 11:38 ` David Laight
2021-07-17 12:38 ` [PATCH v3 2/5] serial: mvebu-uart: implement UART clock driver for configuring UART base clock Pali Rohár
2021-07-17 12:38 ` Pali Rohár
2021-07-17 17:26 ` Andrew Lunn
2021-07-17 17:26 ` Andrew Lunn
2021-07-17 18:05 ` Pali Rohár
2021-07-17 18:05 ` Pali Rohár
2021-07-24 9:48 ` Pali Rohár
2021-07-24 9:48 ` Pali Rohár
2021-07-24 16:33 ` Andrew Lunn
2021-07-24 16:33 ` Andrew Lunn
2021-07-25 12:14 ` Pali Rohár
2021-07-25 12:14 ` Pali Rohár
2021-07-17 12:38 ` [PATCH v3 3/5] dt-bindings: mvebu-uart: document DT bindings for marvell,armada-3700-uart-clock Pali Rohár
2021-07-17 12:38 ` [PATCH v3 3/5] dt-bindings: mvebu-uart: document DT bindings for marvell, armada-3700-uart-clock Pali Rohár
2021-07-17 17:30 ` Andrew Lunn
2021-07-17 17:30 ` Andrew Lunn
2021-08-02 14:45 ` Pali Rohár
2021-08-02 14:45 ` Pali Rohár
2021-07-17 12:38 ` [PATCH v3 4/5] arm64: dts: marvell: armada-37xx: add device node for UART clock and use it Pali Rohár
2021-07-17 12:38 ` Pali Rohár
2021-07-17 12:38 ` [PATCH v3 5/5] serial: mvebu-uart: implement support for baudrates higher than 230400 Pali Rohár
2021-07-17 12:38 ` Pali Rohár
2021-08-02 14:45 ` [PATCH v4 0/6] serial: mvebu-uart: Support for higher baudrates Pali Rohár
2021-08-02 14:45 ` Pali Rohár
2021-08-02 14:45 ` [PATCH v4 1/6] math64: New DIV_U64_ROUND_CLOSEST helper Pali Rohár
2021-08-02 14:45 ` Pali Rohár
2021-08-02 14:45 ` [PATCH v4 2/6] serial: mvebu-uart: implement UART clock driver for configuring UART base clock Pali Rohár
2021-08-02 14:45 ` Pali Rohár
2021-08-02 14:45 ` [PATCH v4 3/6] dt-bindings: mvebu-uart: document DT bindings for marvell,armada-3700-uart-clock Pali Rohár
2021-08-02 14:45 ` [PATCH v4 3/6] dt-bindings: mvebu-uart: document DT bindings for marvell, armada-3700-uart-clock Pali Rohár
2021-08-06 0:30 ` [PATCH v4 3/6] dt-bindings: mvebu-uart: document DT bindings for marvell,armada-3700-uart-clock Stephen Boyd
2021-08-06 0:30 ` [PATCH v4 3/6] dt-bindings: mvebu-uart: document DT bindings for marvell, armada-3700-uart-clock Stephen Boyd
2021-08-06 8:28 ` [PATCH v4 3/6] dt-bindings: mvebu-uart: document DT bindings for marvell,armada-3700-uart-clock Pali Rohár
2021-08-06 8:28 ` Pali Rohár
2021-08-12 19:33 ` Stephen Boyd
2021-08-12 19:33 ` [PATCH v4 3/6] dt-bindings: mvebu-uart: document DT bindings for marvell, armada-3700-uart-clock Stephen Boyd
2021-08-12 20:08 ` [PATCH v4 3/6] dt-bindings: mvebu-uart: document DT bindings for marvell,armada-3700-uart-clock Pali Rohár
2021-08-12 20:08 ` Pali Rohár
2021-08-02 14:45 ` [PATCH v4 4/6] dt-bindings: mvebu-uart: update information about UART clock Pali Rohár
2021-08-02 14:45 ` Pali Rohár
2021-08-02 14:45 ` [PATCH v4 5/6] arm64: dts: marvell: armada-37xx: add device node for UART clock and use it Pali Rohár
2021-08-02 14:45 ` Pali Rohár
2021-08-02 14:45 ` [PATCH v4 6/6] serial: mvebu-uart: implement support for baudrates higher than 230400 Pali Rohár
2021-08-02 14:45 ` Pali Rohár
2021-08-09 14:53 ` [PATCH v5 0/6] serial: mvebu-uart: Support for higher baudrates Pali Rohár
2021-08-09 14:53 ` Pali Rohár
2021-08-09 14:53 ` [PATCH v5 1/6] math64: New DIV_U64_ROUND_CLOSEST helper Pali Rohár
2021-08-09 14:53 ` Pali Rohár
2021-08-09 14:53 ` [PATCH v5 2/6] serial: mvebu-uart: implement UART clock driver for configuring UART base clock Pali Rohár
2021-08-09 14:53 ` Pali Rohár
2021-08-09 14:53 ` [PATCH v5 3/6] dt-bindings: mvebu-uart: document DT bindings for marvell,armada-3700-uart-clock Pali Rohár
2021-08-09 14:53 ` [PATCH v5 3/6] dt-bindings: mvebu-uart: document DT bindings for marvell, armada-3700-uart-clock Pali Rohár
2021-08-09 14:53 ` [PATCH v5 4/6] dt-bindings: mvebu-uart: update information about UART clock Pali Rohár
2021-08-09 14:53 ` Pali Rohár
2021-08-09 14:53 ` [PATCH v5 5/6] arm64: dts: marvell: armada-37xx: add device node for UART clock and use it Pali Rohár
2021-08-09 14:53 ` Pali Rohár
2021-08-09 14:53 ` [PATCH v5 6/6] serial: mvebu-uart: implement support for baudrates higher than 230400 Pali Rohár
2021-08-09 14:53 ` Pali Rohár
2021-08-20 17:22 ` [PATCH v5 0/6] serial: mvebu-uart: Support for higher baudrates Pali Rohár
2021-08-20 17:22 ` Pali Rohár
2021-08-31 8:35 ` Pali Rohár
2021-08-31 8:35 ` Pali Rohár
2021-09-21 7:41 ` Greg Kroah-Hartman
2021-09-21 7:41 ` Greg Kroah-Hartman
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