linux-kernel - [tip:x86/cleanups] x86/tsc: Get rid of custom DIV

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Date:	Thu, 19 Jun 2014 22:12:44 -0700
From:	tip-bot for Michal Nazarewicz <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	tglx@...utronix.de, rientjes@...gle.com, mina86@...a86.com
Subject: [tip:x86/cleanups] x86/tsc: Get rid of custom DIV_ROUND() macro

Commit-ID:  891715793f0451e5114d200be932ac14ce8521a3
Gitweb:     http://git.kernel.org/tip/891715793f0451e5114d200be932ac14ce8521a3
Author:     Michal Nazarewicz <mina86@...a86.com>
AuthorDate: Thu, 19 Jun 2014 03:58:36 +0200
Committer:  H. Peter Anvin <hpa@...or.com>
CommitDate: Thu, 19 Jun 2014 22:04:50 -0700

x86/tsc: Get rid of custom DIV_ROUND() macro

When invoced for positive values, DIV_ROUND macro defined in
arch/x86/kernel/tsc.c behaves exactly like DIV_ROUND_CLOSEST from
include/linux/kernel.h file, so remove the custom macro in favour
of the shared one.

[ hpa: changed line breaks ]

Signed-off-by: Michal Nazarewicz <mina86@...a86.com>
Link: http://lkml.kernel.org/r/1403143116-21755-1-git-send-email-mina86@mina86.com
Acked-by: David Rientjes <rientjes@...gle.com>
Signed-off-by: H. Peter Anvin <hpa@...or.com>
---
 arch/x86/kernel/tsc.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index 57e5ce1..8764232 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -234,9 +234,6 @@ static inline unsigned long long cycles_2_ns(unsigned long long cyc)
 	return ns;
 }
 
-/* XXX surely we already have this someplace in the kernel?! */
-#define DIV_ROUND(n, d) (((n) + ((d) / 2)) / (d))
-
 static void set_cyc2ns_scale(unsigned long cpu_khz, int cpu)
 {
 	unsigned long long tsc_now, ns_now;
@@ -259,7 +256,9 @@ static void set_cyc2ns_scale(unsigned long cpu_khz, int cpu)
 	 * time function is continuous; see the comment near struct
 	 * cyc2ns_data.
 	 */
-	data->cyc2ns_mul = DIV_ROUND(NSEC_PER_MSEC << CYC2NS_SCALE_FACTOR, cpu_khz);
+	data->cyc2ns_mul =
+		DIV_ROUND_CLOSEST(NSEC_PER_MSEC << CYC2NS_SCALE_FACTOR,
+				  cpu_khz);
 	data->cyc2ns_shift = CYC2NS_SCALE_FACTOR;
 	data->cyc2ns_offset = ns_now -
 		mul_u64_u32_shr(tsc_now, data->cyc2ns_mul, CYC2NS_SCALE_FACTOR);
--
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