diff options
| author | Ashok Reddy Soma <ashok.reddy.soma@xilinx.com> | 2022-02-23 15:36:04 +0100 |
|---|---|---|
| committer | Michal Simek <michal.simek@xilinx.com> | 2022-03-09 12:34:47 +0100 |
| commit | 3adc17f60bf804fd8fe25e7c20399243f26d7f49 (patch) | |
| tree | a12270522aedb359a68edcd28060503190481b3b /include/linux | |
| parent | 7d9ee4667240070407bf2612c36d82bfab8840ba (diff) | |
lib: div64: Add support for round up of div64_u64
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>
Link: https://lore.kernel.org/r/f9fdcba76cd692ae436b1d7883b490e3dc207231.1645626962.git.michal.simek@xilinx.com
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/math64.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/math64.h b/include/linux/math64.h index 08584c8f237..eaa9fd5b968 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 */ |