On Thu, Nov 12, 2020 at 02:27:49PM -0700, Shuah Khan wrote: > atomic64_t depends on CONFIG_64BIT > > include/linux/types.h > > #ifdef CONFIG_64BIT > typedef struct { > s64 counter; > } atomic64_t; > #endif That's because some 32bit archs need to override the type definition. atomic64_t is available on 32bit, although sometimes it is atrocious crap.