From: Ashok Reddy Soma ashok.reddy.soma@xilinx.com
Most of the frequencies are not rounded up to a proper number. When we need to devide these frequencies to get a number for example frequency in Mhz, we see it as one less than the actual intended value. Ex: If we want to get Mhz from frequency 199999994hz, we will calculate it using div64_u64(199999994, 1000000) and we will get 199Mhz in place of 200Mhz.
Add a macro DIV64_U64_ROUND_UP for rounding up div64_u64. This is taken from linux 'commit 68600f623d69("mm: don't miss the last page because of round-off error")'.
Signed-off-by: Ashok Reddy Soma ashok.reddy.soma@xilinx.com Signed-off-by: Michal Simek michal.simek@xilinx.com ---
include/linux/math64.h | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/include/linux/math64.h b/include/linux/math64.h index 08584c8f237f..eaa9fd5b9685 100644 --- a/include/linux/math64.h +++ b/include/linux/math64.h @@ -48,6 +48,9 @@ static inline u64 div64_u64(u64 dividend, u64 divisor) return dividend / divisor; }
+#define DIV64_U64_ROUND_UP(ll, d) \ + ({ u64 _tmp = (d); div64_u64((ll) + _tmp - 1, _tmp); }) + /** * div64_s64 - signed 64bit divide with 64bit divisor */