Messages in this thread Patch in this message | | | From | Jacob Pan <> | Subject | [RFC PATCH 1/3] ktime: add a roundup function | Date | Mon, 2 Nov 2015 16:10:26 -0800 |
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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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