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authorLinus Torvalds <torvalds@linux-foundation.org>2015-05-23 17:57:40 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-05-23 17:57:40 -0700
commitc5db6a3bdeb72f4238e1faefa4ce4eab7a64baea (patch)
treee0034ec600453c1c1377e6b42f8818d56127617c /kernel
parentMerge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip (diff)
parentktime: Fix ktime_divns to do signed division (diff)
downloadlinux-dev-c5db6a3bdeb72f4238e1faefa4ce4eab7a64baea.tar.xz
linux-dev-c5db6a3bdeb72f4238e1faefa4ce4eab7a64baea.zip
Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull timer fix from Thomas Gleixner: "One more fix from the timer departement: - Handle division of negative nanosecond values proper on 32bit. A recent cleanup wrecked the sign handling of the dividend and dropped the check for negative divisors" * 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: ktime: Fix ktime_divns to do signed division
Diffstat (limited to 'kernel')
-rw-r--r--kernel/time/hrtimer.c14
1 files changed, 8 insertions, 6 deletions
diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index 76d4bd962b19..93ef7190bdea 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -266,21 +266,23 @@ lock_hrtimer_base(const struct hrtimer *timer, unsigned long *flags)
/*
* Divide a ktime value by a nanosecond value
*/
-u64 __ktime_divns(const ktime_t kt, s64 div)
+s64 __ktime_divns(const ktime_t kt, s64 div)
{
- u64 dclc;
int sft = 0;
+ s64 dclc;
+ u64 tmp;
dclc = ktime_to_ns(kt);
+ tmp = dclc < 0 ? -dclc : dclc;
+
/* Make sure the divisor is less than 2^32: */
while (div >> 32) {
sft++;
div >>= 1;
}
- dclc >>= sft;
- do_div(dclc, (unsigned long) div);
-
- return dclc;
+ tmp >>= sft;
+ do_div(tmp, (unsigned long) div);
+ return dclc < 0 ? -tmp : tmp;
}
EXPORT_SYMBOL_GPL(__ktime_divns);
#endif /* BITS_PER_LONG >= 64 */