On Sat, Apr 13, 2019 at 03:32:34AM +0000, Cheng Jian wrote: > group_share and group_runnable are tracked as 'unsigned long', > however some functions using them as 'long' which is ultimately > assigned back to 'unsigned long' variables in reweight_entity. > > Since there is not scope on using a different and signed type, > this change improves code consistency and avoids further type > conversions. More important, to prevent undefined behavior > caused by overflow.
There is no undefined behaviour due to overflow. UBSAN is broken, upgrade to GCC8 or later.
