linux-kernel - [PATCH] vt: use msecs_to_jiffies for time conversion

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Date:	Mon,  9 Feb 2015 10:54:10 -0500
From:	Nicholas Mc Guire <hofrat@...dl.org>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Jiri Slaby <jslaby@...e.cz>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Adam Borowski <kilobyte@...band.pl>,
	Peter Hurley <peter@...leysoftware.com>,
	David Herrmann <dh.herrmann@...il.com>,
	Imre Deak <imre.deak@...el.com>, Takashi Iwai <tiwai@...e.de>,
	Peng Fan <van.freenix@...il.com>, linux-kernel@...r.kernel.org,
	Nicholas Mc Guire <hofrat@...dl.org>
Subject: [PATCH] vt: use msecs_to_jiffies for time conversion

Converting milliseconds to jiffies by "val * HZ / 1000" is technically
OK but msecs_to_jiffies(val) is the cleaner solution and handles all
corner cases correctly. This is a minor API consolidation only and 
should make things more readable.

Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org>
---

Patch was compile tested with x86_64_defconfig
(implies CONFIG_HW_CONSOLE=y and CONFIG_VT=y)

Patch is against 3.19.0-rc7 (localversion-next is -next-20150209)

 drivers/tty/vt/vt.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index 6e00572..ea7ba03 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -1573,7 +1573,7 @@ static void setterm_command(struct vc_data *vc)
 		case 11: /* set bell duration in msec */
 			if (vc->vc_npar >= 1)
 				vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
-					vc->vc_par[1] * HZ / 1000 : 0;
+					msecs_to_jiffies(vc->vc_par[1]) : 0;
 			else
 				vc->vc_bell_duration = DEFAULT_BELL_DURATION;
 			break;
-- 
1.7.10.4

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