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Groups > linux.kernel > #1269187

[PATCH 1/4] ktime: add a roundup function

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ktime roundup function can be used to keep timer aligned and
prevent drift for recurring timeouts.

Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
---
 include/linux/ktime.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/linux/ktime.h b/include/linux/ktime.h
index 2b6a204..2e293fa 100644
--- a/include/linux/ktime.h
+++ b/include/linux/ktime.h
@@ -233,6 +233,16 @@ static inline ktime_t ktime_sub_us(const ktime_t kt, const u64 usec)
 
 extern ktime_t ktime_add_safe(const ktime_t lhs, const ktime_t rhs);
 
+static inline ktime_t ktime_roundup(ktime_t x, ktime_t y)
+{
+	u64 temp_tv64;
+
+	temp_tv64 = x.tv64 + y.tv64 - 1;
+	temp_tv64 = div64_u64(temp_tv64, y.tv64);
+	x.tv64 = temp_tv64 * y.tv64;
+
+	return x;
+}
 /**
  * ktime_to_timespec_cond - convert a ktime_t variable to timespec
  *			    format only if the variable contains data
-- 
1.9.1

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[PATCH 0/4] CFS idle injection Jacob Pan <jacob.jun.pan@linux.intel.com> - 2015-11-13 21:00 +0100
  [PATCH 1/4] ktime: add a roundup function Jacob Pan <jacob.jun.pan@linux.intel.com> - 2015-11-13 21:00 +0100
    Re: [PATCH 1/4] ktime: add a roundup function John Stultz <john.stultz@linaro.org> - 2015-11-13 21:20 +0100
      Re: [PATCH 1/4] ktime: add a roundup function Jacob Pan <jacob.jun.pan@linux.intel.com> - 2015-11-13 23:40 +0100
    Re: [PATCH 1/4] ktime: add a roundup function Thomas Gleixner <tglx@linutronix.de> - 2015-11-13 21:20 +0100
      Re: [PATCH 1/4] ktime: add a roundup function Jacob Pan <jacob.jun.pan@linux.intel.com> - 2015-11-13 23:40 +0100

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