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hangcheck-timer: cleanup casting in hangcheck_init()

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The 32 bit addition "(hangcheck_margin + hangcheck_tick)" could
potentially overflow.  It triggers a static checker warning to have an
overflowed addition followed by a no-op cast.  I have moved the cast so
that the addition can't overflow.

Also I removed the unneeded cast on the following line since both
"hangcheck_tsc_margin" and "TIMER_FREQ" are already 64 bit types.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Carpenter 2014-10-29 11:42:50 +03:00 committed by Greg Kroah-Hartman
parent d25221525e
commit d0439a5442
1 changed files with 2 additions and 2 deletions
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4
drivers/char/hangcheck-timer.c
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@ -168,8 +168,8 @@ static int __init hangcheck_init(void)
printk("Hangcheck: starting hangcheck timer %s (tick is %d seconds, margin is %d seconds).\n",
VERSION_STR, hangcheck_tick, hangcheck_margin);
hangcheck_tsc_margin =
(unsigned long long)(hangcheck_margin + hangcheck_tick);
hangcheck_tsc_margin *= (unsigned long long)TIMER_FREQ;
(unsigned long long)hangcheck_margin + hangcheck_tick;
hangcheck_tsc_margin *= TIMER_FREQ;
hangcheck_tsc = ktime_get_ns();
mod_timer(&hangcheck_ticktock, jiffies + (hangcheck_tick*HZ));