linux-kernel - [PATCH] vt: vt_ioctl: use msecs_to

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Date:	Mon,  9 Feb 2015 10:53:25 -0500
From:	Nicholas Mc Guire <hofrat@...dl.org>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Jiri Slaby <jslaby@...e.cz>, linux-kernel@...r.kernel.org,
	Nicholas Mc Guire <hofrat@...dl.org>
Subject: [PATCH] vt: vt_ioctl: 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_ioctl.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/vt/vt_ioctl.c b/drivers/tty/vt/vt_ioctl.c
index 2bd78e2..97d5a74 100644
--- a/drivers/tty/vt/vt_ioctl.c
+++ b/drivers/tty/vt/vt_ioctl.c
@@ -388,7 +388,7 @@ int vt_ioctl(struct tty_struct *tty,
 		 * Generate the tone for the appropriate number of ticks.
 		 * If the time is zero, turn off sound ourselves.
 		 */
-		ticks = HZ * ((arg >> 16) & 0xffff) / 1000;
+		ticks = msecs_to_jiffies((arg >> 16) & 0xffff);
 		count = ticks ? (arg & 0xffff) : 0;
 		if (count)
 			count = PIT_TICK_RATE / count;
-- 
1.7.10.4

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