The commit 4c52729377ea ("kernel.h: split out kstrtox() and simple_strtox()
to a separate header") moved the kstrtou64 function to a new header called
linux/kstrtox.h.
Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>