tree 100e400b1bbb4909ef54689ce1907ac6ecf4e59e
parent 56144737e67329c9aaed15f942d46a6302e2e3d8
author Arnd Bergmann <arnd@arndb.de> 1573245265 +0100
committer Thomas Gleixner <tglx@linutronix.de> 1573542915 +0100

time: Optimize ns_to_timespec64()

ns_to_timespec64() calls div_s64_rem(), which is a rather slow function on
32-bit architectures, as it cannot take advantage of the do_div()
optimizations for constant arguments.

Open-code the div_s64_rem() function in ns_to_timespec64(), so a constant
divider can be passed into the optimized div_u64_rem() function.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20191108203435.112759-3-arnd@arndb.de